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| v2.3 10/06/25 1 ES51955(5000counts) dual display/inrush features ? 5000 counts dual lcd display ? 128l qfp package ? 3v dc power supply ? adc conversion rate : 3.3 times/s ? full automatic measurement *voltage measurement: 500.0mv ? 1000v *current measurement: 50.00a/500.0a, 500a/5000a *flame rod dcua mode measurement: 500.0ua/5000ua both manual ranges *smart auto check for r/s/d/c mode resistance: 500.0 ~5.000m capacitance: 5.000nf~500.0uf ( taiwan patent no.: 326361 ) *not contact ac electric field detection *frequency mode active on sub-display for aca 500.0hz ~ 5000hz *resistance measurement: 500.0 ? ? 50.00m ? *capacitance measurement: 5.000nf ? 50.00mf ( taiwan patent no.: 323347, 453443 ) *frequency counter with duty cycle display: 500.0hz ? 50.00mhz 5% ? 95% (< 10khz) ? zero function for dca mode ? voltage high crest factor detection ( taiwan patent no.: 234661 ) ? voltage & current measured simultaneously acv+aca, dcv+dca ? diode measurement & continuity check ? auto range temperature mode(500.0 0 c /5000 0 c) ? temperature mode with in ternal scale translation circuit from 0 c to 0 f ? push functions: *single select key operation: zero for dca hz for aca *range change function *inrush function: aca clampmeter only *data hold function *back light function *semi-auto calibration operation ( taiwan patent no.: 367334 ) ? low pass filter for aca measurement ? band-gap reference voltage output ? ce selection (dc/ac 1010v, dc/ac 610v) ? lcd segment check when power on ? auto power off (30min/15min) ? sleep state indicative signal output ? re-power on ? on-chip buzzer driver ? high voltage (hv) danger indication ? low battery multi-level detection description ES51955 is an integrated analog - to - digital converter (adc) with dual 5,000-count lcd display, which 4-digit main-display (ac/dc voltage) and 4-digit sub-display (ac/dc current), automatic range selection, and 3v dc power supply. ES51955 could be designed for a clamp-meter with v & a measurement simultaneously. automatic range selection is provided for voltage (ac/dc) measurement, resistance measurement, current measurement, capacitance measurement, and frequency counter. other features include inrush function, offset removing feature for dca clampmeter, data holding, duty cycle measurement, diode measurement, temperature measurement, continuity checking, multi-level low battery detection, auto power off, re-power on, backlight driver, and buzzer output driver.
v2.3 10/06/25 2 ES51955(5000counts) dual display/inrush application clamp meter pin assignment lqfp-128l 1 2 34 a b c d 4 3 2 1 d c b a ado_a 1 ivsh 10 adi_a 2 test5a 3 acvla 4 acvha 5 csh+ 6 csh- 7 va- 8 raz_a 12 ivsl 9 adp 11 buf_a 13 caz_a 14 cint_a 15 cln_a 16 vrh 18 clp_v 19 cln_v 20 cint_v 21 caz_v 22 buf_v 23 raz 24 ohmc3 26 ohmc2 27 ohmc1 28 vr_a 29 ohmc4 25 dacao 30 vr 31 dacvo 32 or1 33 vr5 34 vr4 35 vr2 37 vr3 36 ovsg 38 vr1 39 acvl_v 40 acvh_v 41 adi_v 42 ado_v 43 test5v 44 sgnd 45 ca- 46 ca+ 47 r9k 48 r1k 49 ovx 50 ovh 51 lpc1 53 lpc2 54 lpc3 55 lpfout 56 sleep 57 buzi n 58 freq 59 cal_en 60 sda 61 scl 62 seg23 64 seg22 65 seg21 66 seg20 67 seg19 68 seg18 69 seg17 70 seg16 71 seg15 72 seg14 73 seg13 74 seg12 75 seg11 76 seg10 77 seg09 78 seg08 79 seg07 80 seg06 81 seg05 82 seg04 83 seg03 84 seg02 85 seg01 86 bp4 87 bp3 88 bp2 89 bp1 90 alarm 91 bzout 92 bkout 93 osc1 94 osc2 95 lcdcap 96 opt_nf 97 c_clamp 98 s50v 99 svr 100 aposel 101 cal_nf 102 cesel 103 tsel 104 alarm1 105 dis_lpf 106 disdgb 107 disdca 108 enir 109 bkli t 110 sel 111 hold 112 range 113 sac 114 fc4 115 fc3 116 fc2 117 fc1 118 c- 119 c+ 120 lbat9 121 v- 122 v- 123 v+ 124 v+ 125 dgnd 126 agnd 127 agnd 128 clp_a 17 ovh1 52 seg24 63 ES51955 v2.3 10/06/25 3 ES51955(5000counts) dual display/inrush pin description pin no symbol type description 1 ado_a o output of internal ac to dc op amp for aca mode. 2 adi_a i negative input of internal ac to dc op amp for aca mode. 3 test5_a o buffer output of sgnd for aca mode 4 acvl_a o dc signal low input in aca mode. connect to negative output of external ac to dc converter. 5 acvh_a o dc signal high input in aca mode. connect to positive output of external ac to dc converter. 6 csh+ i/o cap for duty-cycle and inrush mode 7 csh- i/o cap for duty-cycle and inrush mode 8 va- i for adp mode. de-integrating voltage negative input 9 ivsl i current measurement input for higher range. 10 ivsh i current measurement input for lower range. 11 adp i measurement input in adp m ode. (current/temperature/ncv mode) 12 raz_a o buffer output pin in az and zi phase for adc_a. 13 buf_a o buffer output pin for adc_a. connect to integral resistor 14 caz_a o auto-zero capacitor connection for adc_a. 15 cint_a o integrator output for adc_a. connect to integral capacitor. 16 cln_a i/o negative connection for reference capacitor of adc_a. 17 clp_a i/o positive connection fo r reference capacitor of adc_a. 18 vrh o output of band-gap voltage reference. typically ?1.23v 19 clp_v i/o positive connection fo r reference capacitor of adc_v. 20 cln_v i/o negative connection for reference capacitor of adc_v. 21 cint_v o integrator output for adc _v. connect to integral capacitor. 22 caz_v o auto-zero capacitor connection for adc_v. 23 buf_v o buffer output pin for adc_v. connect to integral resistor 24 raz o buffer output pin in az and zi phase for adc_v. 25-28 ohmc1-4 o filter capacitor connection1-4 for resistance mode. 29 vr_a i reference input voltage in current mode or adp. typically ?400mv 30 dac_ao o dac output for current mode or adp input mode 31 vr i reference input voltage in voltage mode. typically ?400mv 32 dac_vo o dac output for voltage mode 33 or1 o reference resistor connection for 500.00 ? range 34 vr5 o voltage measurement 10000 attenuator(1000v) 35 vr4 o voltage measurement 1000 attenuator(500.0v) 36 vr3 o voltage measurement 100 attenuator(50.00v) 37 vr2 o voltage measurement 10 attenuator(5.000v) 38 ovsg o sense low voltage for resistance/voltage measurement 39 vr1 i measurement input. connect to a precise 10m ? resistor. 40 acvl_v o dc signal low input in acv mode. connect to negative output of external ac to dc converter. 41 acvh_v o dc signal high input in acv mode. connect to positive output of external ac to dc converter. 42 adi_v i negative input of internal ac to dc op amp for acv mode. 43 ado_v o output of internal ac to dc op amp for acv mode. 44 test5_v o buffer output of ovsg for acv mode 45 sgnd g signal ground. 46 ca- i/o negative auto-zero capacitor connection for capacitor measurement 47 ca+ i/o positive auto-zero capacitor connection for capacitor measurement 48 r9k o connect to a precise 9k ? resister for capacitor measurement. 49 r1k o connect to a precise 1k ? resister for capacitor measurement. 50 ovx i sense input for resist ance/capacitance measurement 51 ovh o output connection for resistance measurement 52 ovh1 o output connection for resistance measurement (optional) v2.3 10/06/25 4 ES51955(5000counts) dual display/inrush 53 lpfc1 o capacitor c1 connection for internal low-pass filter 54 lpfc2 o capacitor c2 connection for internal low-pass filter 55 lpfc3 o capacitor c3 connection for internal low-pass filter 56 lpfout o capacitor c1 connection for internal low-pass filter 57 sleep o sleep mode indicator, asserts low in sleep mode. 58 buzin i pull to v- to enable the buzout. 59 freq i frequency counter input, offset v-/2 internally by the chip. 60 cal_en i pulled to v- to enable the semi-auto calibration scheme. 61 sda i/o input/output from/to eeprom 24c02 data 62 scl o output to eeprom 24c02 clock 63-86 seg24-seg01 o lcd segment output driver 01-24 (seg signals) 87-90 bp4-bp1 o lcd backplane 1-4 (com signals) 91 alarm o led control output driver for hv indication and ncv detection 92 buzout o outputs a 2khz audio frequency signal for driving piezoelectric buzzer when buzin is low or functional key is active. 93 bkout o if bklit function is enabled, this pin will change from v- to v+ for 60 sec, once press bklit pin again within 60 sec, this pin will change back to v-. 94 osc1 i crystal oscillator input connection 95 osc2 o crystal oscillator output connection 96 lcdcap i lcd bias voltage bypass capacitor connection 97 opt_nf i pull to v- to change the initial range to 50nf in cap mode. 98 c_clamp i pull to v- to change the initial range to 5uf in cap mode. 99 s50v i switch control for function selection 100 svr i switch control for function selection 101 aposel i auto power off idle time selection 102 cal_nf i pulled to v- to enable the small capacitor calibration scheme. 103 cesel i ol selection feature control pin in voltage mode. 104 tsel i pulled to v- to cancel the 500 o c auto range mode 105 alarm1 o led control output driver for short-circuit detected in cont. mode. 106 dis_lpf i pulled to v- to disable the low-pass-filter path in aca mode 107 dis_dgb i pulled to v- to disable the buzzer beeper when hv danger appears. 108 dis_dca i pulled to v- to disable dca function in dcv mode. 109 enir i pulse to v- to enable the inrush function for clamp aca mode 110 bklit i back light function. pulse to v- to set bkout pin output. 111 sel i pulse to v- to enable function selection 112 hold i pulse to v- to enable hold function. 113 range i pulse to v- to enable manual mode and manual range selection. 114 sac i switch for ac/dc function selection. 115-118 fc4-fc1 i switches for function selection. 119 c- o negative capacitor connection for on-chip dc-dc converter. 120 c+ o positive capacitor connec tion for on-chip dc-dc converter. 121 lbat9 i multi-level low battery configuration input. simple external resistor divider is required. 122 v- p negative supply voltage. 123 v- p negative supply voltage. 124 v+ o output of on-chip dc-dc converter and positive supply voltage. 125 v+ o output of on-chip dc-dc converter and positive supply voltage. 126 dgnd p/g digital ground. 127 agnd p/g analog ground. 128 agnd p/g analog ground. v2.3 10/06/25 5 ES51955(5000counts) dual display/inrush absolute maximum ratings characteristic rating supply voltage ( v - to agnd) -4v a nalog input voltage v- -0.6 to v+ +0.6 v + v+ (agnd/dgnd+0.5v) a gnd/dgnd agnd/dgnd (v- -0.5v) d igital inpu t v- -0.6 to dgnd +0.6 p ower dissipation. flat package 500mw opera t ing temperature 0 to 70 storage temperature -25 to 125 electrical characteristics ta=25 , v- = -3.0v parameter symbol test condition min. typ. max units power supply v- -2.5 -3.0 -3.5 v i dd normal operation 1.9 2.2 ma operating supply current in dcv+dca mode i ss in sleep mode 5 10 a voltage roll-over error rev 10m ? input resisto r 0.1 %f.s 1 voltage nonlinearity nlv best case straight line 0.1 %f.s 1 input leakage -10 1 10 pa zero input reading 10m ? input resistor -000 000 +000 counts band-gap reference voltage v ref 100k ? resistor between vrh and agnd -1.29 -1.23 -1.17 v open circuit voltage for 500 ? measurement -3.0 v open circuit voltage for other ? measurement -1.19 -1.08 -0.97 v peak to peak backplane drive voltage -3.5v v- -2.5v 2.9 3.1 3.3 v internal pull-high to 0v current i pull-up pin97-118 inputs 1.2 a 1% 40-400 ac frequency response at 5.000v range 5% 400-2000 hz v t1 2.15 multi-level low battery detector v t2 lbat9 vs. v- 1.82 v 3db bandwidth for aca mode f 3db low-pass-filter on 4 khz v2.3 10/06/25 6 ES51955(5000counts) dual display/inrush rsdc smart mode res sensitivity parasitic capacitance allowed in 5.000m range 200 pf rsdc smart mode diod e sensitivity forward voltage 0.8 v rsdc scan mode cap sensitivity 400 pf reference voltage temperature coefficient tc rf 100k ? resister between vrh/gnd 0 v2.3 10/06/25 7 ES51955(5000counts) dual display/inrush 1.2 dual display v.s. measurement mode the dual display default mode configur ation is shown at the table below. main measurement mode first-display second-display (defaulted) dc voltage dc voltage n/a ac voltage ac voltage n/a ncv mode ef electrical field strength resistance mode resistance n/a capacitance mode capacitance n/a frequency mode frequency duty cycle continuity check resistance n/a diode mode voltage n/a smart rsdc mode r/s/d/c n/a temperature mode o c o f dcua mode n/a dcua 1.3 push key operation with dual display, user can use single push key ? sel? to active the volts and amps readings simultaneously. push function first-display second-display sel in dcv mode (function selection) dc voltage dca 1 ? dca/zero 2 see fig.1 sel in acv mode (function selection) ac voltage aca ? ? aca hz 3 see fig.2 sel in smart mode (function selection) r/s/d/c auto scan see fig. 3 n/a hold stop updating stop updating inrush (waiting state) n/a four bars (- - - -) inrush (done) n/a inrush value note: 1. dca mode is not available if dis_dca (pin108) is pulled to v-. 2. dca/zero means the readings shown on lcd is offset-cancelled readings. 3. hz mode is the frequency reading of aca mode. v2.3 10/06/25 8 ES51955(5000counts) dual display/inrush fig.1 sel key operation in dcv + dca(zero) mode 4.8 9 9 v 0.0 5 a 4.8 9 9 v 4.8 9 9 v 0.0 0 a dcv dcv+dca dcv+dca zero push <1s push <1s push >1s zero dc dc dc auto auto auto 4.8 9 9 v 4.8 9 9 v 0.0 5 a 4.8 9 9 v 4.8 9 9 v 4.8 9 9 v 0.0 0 a dcv dcv+dca dcv+dca zero push <1s push <1s push >1s zero dc dc dc auto auto auto fig. 2 sel key operation in acv + aca(hz) mode 2 1 9.9 v 9 0.9 3 a 2 1 9.9 v 6 0.0 hz 2 1 9.9 v acv push <1s acv+aca acv+hz of aca push <1s push >1s ac ac ac auto auto auto 2 1 9.9 v 2 1 9.9 v 9 0.9 3 a 2 1 9.9 v 2 1 9.9 v 6 0.0 hz 2 1 9.9 v acv push <1s acv+aca acv+hz of aca push <1s push >1s ac ac ac auto auto auto high voltage warning fig. 3 sel key operation in smar t (r/s/d/c auto scan) mode r/s/d/c auto scan resistance measurement diode measurement capacitance measurement push sel key < 1s continuity measurement v2.3 10/06/25 9 ES51955(5000counts) dual display/inrush 2. operating modes 2.1. semi-auto calibration scheme ES51955 includes dmm & clamp_on mete r features in single chip. dmm manufacturers need the calibration process in production. the traditional solution needs the variable resistors for calibration by manual adjustment. ES51955 provide another calibration scheme and the variable resist ors could be ignored. when ES51955 is at off-state, pull cal_en (pin 60) to v- to active the calibration sche me after re-power on. a digital controlled voltage output will be active from dac_ao & dac_vo. when semi-auto calibration scheme is active, use hold (or bklit ) key to decrease voltage and use range key to increase the voltage. decrease the reference voltage means the counts on display will be increased. increase the refe rence voltage means the counts on display will be decreased. the adjustment step is approximate one count . if coarse adjustment is required, push hold (or bklit ) and range larger than one second to speed up to approximate 30 counts per second. after calibration process is finished, push hold (or bklit ) and range (less than one second) simultaneously to save th e digital control code to external eeprom (24c02). range display count up display count down save calibration data to eep rom hold or bklit range range display count up save calibration data to eep hold + range bklit + range rom range display count up display count down save calibration data to eep rom hold or bklit range range display count up save calibration data to eep hold + range bklit + range rom v2.3 10/06/25 10 ES51955(5000counts) dual display/inrush the semi-auto calibration scheme supports th e following seven measurement modes. when cal_en pin is active, set the prop er function switches and push sel key to choose the target measurement mode. when mode is se lected, the lcd segment of unit at related measurement will be blinking. mode default range for cal remark dc voltage measurement ac voltage measurement 5.000v accuracy of other ranges is guaranteed by external resistor dc current measurement ac current measurement 50.00a or 500.0a or 5000a lower range in auto aca mode dc ua measurement 500ua or 5000ua - capacitor measurement 50.00nf set cal_nf to v- temperature measurement 500.0 o c or 5000 o c lower range in auto temperature mode after calibration procedure is finished, set the ES51955 to off-state and set cal_en to dgnd to return to normal operation after re-power on. 2.2. voltage measurement a re-configurable voltage divider automati cally provides a suitable range in voltage measurement mode. the following table summarizes the full-scale ranges in each configuration. configuration full scale range di vider ratio resister connection 1 vr1 500.0mv 1 vr1 (10m ? ) vr2 5.000v 1/10 vr2 (1.111m ? ) vr3 50.00v 1/100 vr3 (101k ? ) vr4 500.0v 1/1000 vr4 (10.01k ? ) vr5 1000v 1/10000 vr5 (1k ? ) note: 1. 500.0mv range only exists in manual mode. 2.2.1 ce selection & high voltage (hv) indication ES51955 has a ce selection feature archived by configuring the pin cesel. in automatic voltage mode, ES51955 will show ol when the voltage is over than the overflow level. if cesel is connected to v- or dgnd, ES51955 will have a 610.0v or 1010v overflow level in voltage mode relatively.. the configuration of cesel is listed below. for fully automatic voltage modes: cesel dcv acv v- 610v 610v dgnd or floating 1010v 1010v v2.3 10/06/25 11 ES51955(5000counts) dual display/inrush during voltage measurement is in operation (dcv or acv), the hv indication will be active when input voltage is la rger than 30v or ol in manual range. the hv indication includes: z hv warning lcd segment active z buzzer output active if dis_dgb (pin107) is kept floating z alarm (pin91) led output active. 2.2.2 ncv mode ES51955 supports a non-contact ac voltage measurement, whic h is called electric field measurement also. the ef mode is selected by setting function control mode fc1-fc4 = [1,0,0,1]. the adc input is configured from adp pin vs. sgnd. when no or less electric field is detected, the first-display lcd s hows ?ef? and the second-display lcd shows ?blank?. if the electric field is detected, the strength will be showed on the second-display lcd by ?-? not digits type. level 1(equivalent to 12.5% full scale of adc) is ?-? and the level 4(equivalent to 100% full scale of adc) is ?----?. additional beeper (buzout pin) and led alarm (alarm pin) will be output from ES51955. the fre quency of buzzer and led alarm depends on the stre ngth of electric field also. the faster beeper means the stronger electric field (ac voltage) is sensed. e f ---- e f - e f -- e f --- manu manu manu manu level 1 (12.5%) level 2 (25%) level 3 (50%) level 4 (100%) e f ---- e f - e f -- e f --- manu manu manu manu level 1 (12.5%) level 2 (25%) level 3 (50%) level 4 (100%) adp 88m ef test circuit efin+ 100 k sgnd agnd efin- va - -400mv v2.3 10/06/25 12 ES51955(5000counts) dual display/inrush 2.3 current measurement for clampmeter (1) aca/dca ES51955 has 2 automatic and 3 manual curr ent measurement modes for clampmeter. the following table summarizes the full-s cale range of each mode. when ES51955 operate in the automatic va1 ~ va2, it takes high input from ivsh/ivsl (higher range/lower range), low input from sgnd and reference voltage from vr_a (pin29). when ES51955 operates in the manual va3 ~ va5, it takes high input from adp, low input from sgnd and referen ce voltage from va- (pin8). mode fc1~4 full scale input terminal va1 0,0,0,0 50.00a / 50.00a ivsl/ivsh v.s. sgnd (500mv) va2 0,0,0,1 500.0a / 5000a ivsl/ivsh v.s. sgnd (500mv) va3 0,1,0,0 50.00a adp v.s. sgnd (500mv) va4 0,1,0,1 500.0a adp v.s. sgnd (500mv) va5 0,1,1,0 5000a adp v.s. sgnd (500mv) note: 1. in dca current modes (sac = 0) , ES51955 provides zero function (push sel key) for offset removing. (2) dcua mode ES51955 has 2 manual dcua current measurem ent modes for flame rod application. the following table summarizes the full scale range of each mode. mode fc1~4 full scale input terminal dcua1 0,0,1,0 500.0ua adp v.s. sgnd (500mv) dcua2 0,0,1,1 5000ua adp v.s. sgnd (500mv) (3) low pass filter (lpf) mode for aca mode a 3 rd order low-pass filter (3db bandwidth = 4khz typ.) with is built in ES51955 to reduce the influence of high frequency noise . the lpf mode is active in aca only if dis_lpf is connected to dgnd or floating. v2.3 10/06/25 13 ES51955(5000counts) dual display/inrush 2.4 resistance measurement ( r ) a re-configurable divider automatically provides a suitable full-scale range in resistance measurement mode. the following table summari zes the full-scale ranges and the reference resistors in each configuration. configuration full scale range relative resistor equivalent value or1 500.0 ? or1 100 ? or2 5.000k ? vr5 1k ? or3 50.00k ? vr4 || vr1 10k ? or4 500.0k ? vr3 || vr1 100k ? or5 5.000m ? vr2 || vr1 1m ? or6 50.00m ? vr1 10m ? 2.5 capacitance measurement ( c ) the following table summarizes the eight ranges of capacitance measurement mode. configuration full scale ran g e relative resistor c1 5.000nf ratio to c2 range c2 50.00nf cal c3 500.0nf ratio to c2 range c4 5.000uf r9k / r1k c5 50.00uf r9k / r1k c6 500.0uf r9k / r1k c7 5.500mf r9k / r1k c8 50.00mf r9k / r1k note: 1. in order to obtain an accurate readin g, a capacitor must be discharged before measurement begins. the chip has a built-in discharge mode to automatically discharge the capacitor. in discharge mode, the main-display shows dis.c 2. discharging through the chip is quite slow. we recommend users to discharge the capacitor with some other apparatus. 3. the c2 range is calibrated by the variable resistance near to the ovx pin when cal_nf (pin 102) is kept floating or use the semi-auto calibration scheme when cal_nf is set to v-. 4. the c1 range zero offset could be compensate d by the small capacitors near to ovh pin. 5. the c7 and c8 measurement period is depend ed on the capacitance of input terminals. v2.3 10/06/25 14 ES51955(5000counts) dual display/inrush 2.6 continuity check ( s ) continuity check shares the same configuration with 500.0 ? manual resistance measurement mode and has buzzer output to indicate continuity. the buzzer generates 2khz beep and alarm1 (pin 105) drive high output (v+ level) when ever the reading is less than 30 ? . the ES51955 built in a high speed short detection circuit and the detection could be less than 10ms. 2.7 diode measurement ( d ) diode measurement mode shares the same configuration with 5.000v manual voltage measurement mode and has buzzer output to indicate continuity. the buzzer generates a 2khz sound and alarm1 (pin 105) drive high output (v+ level) whenever the reading is less than 30mv. if the test circuit is open or the voltage drop between the two ports of the diode under test is larger than 2v, the lcd panel will show ?ol?. 2.8 frequency counter in frequency mode, main-display shows freque ncy and sub-display shows duty cycle at the same time. the time base of the frequency count er is derived from an external crystal oscillator by 4,000,000 t counter = f osc where f osc is the frequency of the crystal oscillator . thus, the counter has a 1-second time base when a 4mhz oscillator is used. the fr equency counter can select the proper range automatically or manually. auto-range operatio n extends over seven decades, from 500.0hz to 50.00mhz. the following table summarizes the full-scale range of the frequency counter. configuration full scale range fr1 500.0hz fr2 5.000khz fr3 50.00khz fr4 500.0khz fr5 5.000mhz fr6 50.00mhz *if input frequency is less th an 5.0hz, ES51955 will show 0.0hz v2.3 10/06/25 15 ES51955(5000counts) dual display/inrush 2.9 duty cycle measurement the duty cycle measurement is available in fr equency mode simultaneously. the duty cycle mode range is available within 5.0% to 95.0% (< 10khz@3vpp). the minimum resolution is 0.1%. if the source frequency duty cycle is smaller than 1.0%, the 0.0% will be shown on the lcd display. if the duty cycle is larger than 98.9%, the ol will be shown on the lcd sub-display. when the frequency is zero, the duty cycle display will be 0.0%. 4.0 0 0 mhz freq + duty cycle 5 0.0 % auto 4.0 0 0 mhz freq + duty cycle 5 0.0 % auto 2.10 temperature measurement mode temperature measurement mode takes input si gnal from adp pin and reference voltage from va-. ES51955 has a built-in oc-to-of scale translation circuit, and only needs an external oc scale application circuit. the app lication circuit for of sc ale is not required. the oc & of readings are shown on the dual-di splay lcd simultaneously. in temperature2 measurement mode, the default range is 5000 oc or 9032 of manual range. in temperature1 measurement mode, the default range is 500.0/5000 oc or 932.0/9032 of auto range. the tsel pin (pin104) is pulled to v-, the temper ature1 measurement mode will be set to 500.0 oc manual mode. range full scale range input terminal temp1 auto 500.0 / 5000 adp v.s. sgnd (50mv/500mv) temp2 manual 5000 adp v.s. sgnd (500mv) v2.3 10/06/25 16 ES51955(5000counts) dual display/inrush 2.11 multi-level low battery voltage detection ES51955 provides a voltage detection input (pin 121: lbat9) for multi-level low battery application. there are two intern al voltage referen ce vt1 & vt2 for comparing with lbat9. if lbat9 is larger than vt1, the lcd segmen t of slb3 ? slb1 will active always. this status implies full battery. when lbat9 is less than vt1 but larger than vt2, the lcd segment of slb3 will disappear and this status implies half battery. when lbat9 is less than vt2, the lcd segment of slb2 will disa ppear and this status implies low battery. when the low battery status lasts for 10 seconds, the lcd segment of slb1 will be blinking. when the slb1 is blinking for 20 seconds, the operation of meter will be inhibited and lcd panel will show ? lo.bt?. in this case, it is suggested to replace a new battery immediately. after ?lo.bt? appears and lasts for 60 seconds, ES51955 will enter to auto power off mode. l o.b t low battery condition > 30s operation not allowed dc 1.8 0 0 v low battery dc auto auto 1.8 0 0 v half battery dc auto 1.8 0 0 v full battery dc auto blinking l o.b t low battery condition > 30s operation not allowed dc 1.8 0 0 v low battery dc auto auto 1.8 0 0 v half battery dc auto 1.8 0 0 v full battery dc auto l o.b t low battery condition > 30s operation not allowed dc 1.8 0 0 v low battery dc auto auto 1.8 0 0 v half battery dc auto 1.8 0 0 v full battery dc auto blinking low battery test circuit (a) 150k 470k ba tt lbat9 v- agnd 0. 1u 0v 3 v low battery test circuit (b) 910k 300k ba tt lbat9 v- agnd 0. 1u 0v 9v v2.3 10/06/25 17 ES51955(5000counts) dual display/inrush 2.12 auto power off (apo) and idle time selection ES51955 has a default auto power off function. if the meter is idle for more than the given idle time, the chip automatically turns the power off. the idle time to trigger the auto power off function is determined by pin ?apose l?. if pin aposel is connected to v-, the idle time will be set to 30 minutes. if pin aposel is connected to dgnd or floating, the idle time will be set to 15 minutes. when apo happens, the state of the meter is saved. the apo sign on the lcd panel indica tes whether the auto power off is enabled or not. if user might want to disable auto power off, power on the meter when any of the push functions, except for hold, is pressed down. note : 1. powering on the meter while pressing hold and last s 2 seconds turns on all lcd segments until hold is pressed again . 2. when low battery status happened (lcd show ?lo.bt ?), the apo idle time will be reset to 60 sec. 2.13 sleep the meter enters sleep mode after auto power off. the sleep pin asserts low (v-) in the sleep mode, and asserts high (v+, not 0v) after re-power on. 2.14 re-power on after auto power-off, pushing any of the pus h function or changing the rotary mode can turn on the meter again. if the meter is re -powered on by changing the rotary mode, the saved state is cleared. if the meter is re-pow ered on by push functions, the chip restores the saved state and enters hold mode. the lcd displays the saved value. v2.3 10/06/25 18 ES51955(5000counts) dual display/inrush 3. measurement mode switching measurement mode depends on the logic leve l of svr, s50v, sac, fc1, fc2, fc3 and fc4. svr s50v sac fc1 fc2 fc3 fc4 function mode remark 0 x 1 0 0 0 0 acv (5.000v) + aca (50.00a / 500.0a) va1 0 x 1 0 0 0 1 acv (5.000v) + aca (500.0a / 5000a) va2 0 x 1 0 1 0 0 acv (5.000v) + aca (50.00a) va3 0 x 1 0 1 0 1 acv (5.000v) + aca (500.0a) va4 0 x 1 0 1 1 0 acv (5.000v) + aca (5000a) va5 1 0 1 0 0 0 0 acv (50.00v) + aca (50.00a / 500.0a) va1 1 0 1 0 0 0 1 acv (50.00v) + aca (500.0a / 5000a) va2 1 0 1 0 1 0 0 acv (50.00v) + aca (50.00a) va3 1 0 1 0 1 0 1 acv (50.00v) + aca (500.0a) va4 1 0 1 0 1 1 0 acv (50.00v) + aca (5000a) va5 1 1 1 0 0 0 0 acv (500.0v) + aca (50.00a / 500.0a) va1 1 1 1 0 0 0 1 acv (500.0v) + aca (500.0a / 5000a) va2 1 1 1 0 1 0 0 acv (500.0v) + aca (50.00a) va3 1 1 1 0 1 0 1 acv (500.0v) + aca (500.0a) va4 1 1 1 0 1 1 0 acv (500.0v) + aca (5000a) va5 0 x 0 0 0 0 0 dcv (5.000v) + dca (50.00a / 500.0a) va1 0 x 0 0 0 0 1 dcv (5.000v) + dca (500.0a / 5000a) va2 0 x 0 0 1 0 0 dcv (5.000v) + dca (50.00a) va3 0 x 0 0 1 0 1 dcv (5.000v) + dca (500.0a) va4 0 x 0 0 1 1 0 dcv (5.000v) + dca (5000a) va5 1 0 0 0 0 0 0 dcv (50.00v) + dca (50.00a / 500.0a) va1 1 0 0 0 0 0 1 dcv (50.00v) + dca (500.0a / 5000a) va2 1 0 0 0 1 0 0 dcv (50.00v) + dca (50.00a) va3 1 0 0 0 1 0 1 dcv (50.00v) + dca (500.0a) va4 1 0 0 0 1 1 0 dcv (50.00v) + dca (5000a) va5 1 1 0 0 0 0 0 dcv (500.0v) + dca (50.00a / 500.0a) va1 1 1 0 0 0 0 1 dcv (500.0v) + dca (500.0a / 5000a) va2 1 1 0 0 1 0 0 dcv (500.0v) + dca (50.00a) va3 1 1 0 0 1 0 1 dcv (500.0v) + dca (500.0a) va4 1 1 0 0 1 1 0 dcv (500.0v) + dca (5000a) va5 x x 0 0 0 1 0 dcua (500.0ua) dcua1 x x 0 0 0 1 1 dcua (5000ua) dcua2 x x x 1 0 0 0 freq + duty cycle fmode x x x 1 0 0 1 ncv (ef) efmode x x x 1 0 1 0 temp (500.0 o c / 5000 o c ) (auto) 1 temp1 x x x 1 0 1 1 temp (5000 o c) temp2 x x 0 1 1 0 0 r (resistance mode) r x x 0 1 1 0 1 s (continuity mode) s x x 0 1 1 1 0 d (diode check mode) d x x 0 1 1 1 1 c (capacitance mode) 2,3 c x x 1 1 1 0 0 r,s rs x x 1 1 1 0 1 r,s,d rsd x x 1 1 1 1 0 r,s,d,c 2,3 rsdc x x 1 1 1 1 1 auto scan rsdc smart x means ?don?t care?. 1 50mv full scale is for 500 o c range and 500mv full scale is for 5000 o c range. when tsel (pin104) is pulled to v-, the 500 o c range is fixed 2 set the c_clamp (pin98) to v- to change initial range of c to 5.000uf. set the opt_nf(p in97) to v- to change initial range of c to 50.00nf. 3 set the opt_nf(pin97) to v- to change initial range of c to 50.00nf. v2.3 10/06/25 19 ES51955(5000counts) dual display/inrush push function all the enabled push functions will be rese t when the measurement mode is changed by rotary switch. the following table lists the available function versus every measurement mode. range hold sel bklit inrush dcv o o o o x dcv + dca o ( v only) o o o x acv o o o o x acv + aca o ( v only) o o o o dcua x o x o x frequency o o x o x ncv ( ef ) x x x o x 3 temp1 o o x o x temp2 x o x o x resistance o o x o x continuity x o x o x diode x o x o x capacitance o o x o x r , s 1 o ( r only) o o o x r , s 1 , d o ( r only) o o o x r , s 1 , d , c o (r/c only) o o o x smart 2 x x o o x note: 1 continuity mode 2 auto check for rsdc mode: max range for r is 5.000m and max range for c is 500.0uf 3 auto range configuration v2.3 10/06/25 20 ES51955(5000counts) dual display/inrush 3.1. hold and delay hold feature hold mode makes the meter stop updating the lc d panel. this mode can be nested in most of the special modes. enabling hold function in automatic mode makes the meter switch to manual mode, but the full-scale range remains the same. ES51955 provides a delay hold feature. to activate delay hol d feature, press dow n the hold bottom and last for 2 seconds. the meter will delay for 6 seconds, than enters hold mode. in the 6-secnod delayed time, the hold symbol on lcd panel will blink. hold function and the delayed state can be cancelled by changing the measurement mode, pressing range, or push hold again. normal mode (auto/manual) hold mode (manual) push < 2s delay state (auto/manual) push > 2s push < 2s push < 2s push > 2s 6sec past 3.2. range range pin configuration is shown below. it is available for voltage, resistance, capacitance, frequency and temperature (temp1) modes. automatic mode manual mode 1 push < 1 sec 1 push > 1 sec 1 p ush < 1 sec range up v2.3 10/06/25 21 ES51955(5000counts) dual display/inrush measurement mode auto manual control range initial range v(dc/ac) vr2 ? vr5 vri vri + 1, vr5 vr1 500.0mv ? 1000v 5.000v 1 auto a(dc/ac) ir1 ? ir2 n/a 3 500.0a ? 5000a 500.0a auto a(ac/dc) ir1 ir2 n/a 3 50.00a ? 500.0a 50.00a 50.00a 50.00a 500.0a 500.0a manual a(ac/dc) fixed fixed 5000a 5000a 500.0ua 500.0ua manual dcua fixed fixed 5000ua 5000ua capacitance c1 ? c8 ci ci + 1, c8 c1 5.000nf? 50.00mf 5.000nf 2 ? or1 ? or6 ori ori + 1, or6 or1 500.0 ? ? 50.00m ? 500.0? continuity fixed fixed 500.0 ? 500.0? diode fixed fixed 5.000v 5.000v temp1 t1-t2 t1 t2 t2 t1 500.0 o c ? 5000 o c 500.0 o c frequency fr1 ? fr6 fri fri + 1 fr6 fr1 500.0hz ? 50.00mhz 500.0hz note: pushing range resets all existing special modes. 1 initial range depends on status of svr & s50v. see measurement mode switching 2 initial range depends on status of c_clamp & opt_nf. 3 when inrush mode is active and waiting for signal triggered, push enir key could change the range of aca. v2.3 10/06/25 22 ES51955(5000counts) dual display/inrush 3.3. inrush function ES51955 provides an inrush function for ac current measurement for clampmeter to dectect the starting-up curre nt of a motor. push enir (pin 109) key to enable the inrush function. in inrush mode, second-display s hows ?- - - -? until the motor starting up and being detected. if the startin g-up current is detected, ES51955 execute the inrush current measurement and held the inrush rms current value with 100ms in tegration period at second-display. when the inrush current measurement is done, press enir could enter inrush mode (waiting state) again. to exit inrush mode, press enir key more than one second. enter inrush mode in automatic ac a modes (fc1-fc4 = [0,0,0,x] will force the range to be locked in manual ra nge. during the waiting state, push enir key to change the manual range of inrush mode. to have the de tail application circuit, please refer to application circuit. any change of the component value may have influence on the inrush characteristic. so it?s not recommended to ha ve any change on these component value. for inrush function, an external true rms-to-dc es636 ic must be required. the flow chart of inrush function is shown below. normal state inrush mode ?waiting state? inrush mode ?first-display n/a? ?second-display: inrush value? press enir detected press enir <1sec press enir key >1sec press enir < 1sec to change range in auto aca mode v2.3 10/06/25 23 ES51955(5000counts) dual display/inrush 3.4. zero function in manual dc 50.00a, 500.0a and 5000a, au to dc 50.00a/500.0a and auto dc 500.0a/5000a mesurement modes, ES51955 provides zero function to remove the residual current value. during dcv and dca mode are active simultaneously, push sel key less than one second to enter zero mode. in zero mode, second-display shows d n+k - d n , where n = 1, 2, 3, , d n is the last conversion value before sel is pushed, and d n+k is the current conversion value. if sel is pushed ag ain in zero mode, second -display will update the d n value and displays the d n+k - d n again. the meter returns to dcv operation only if sel is pressed and held for longer than one second. in 2-range auto dca modes for clampmeter (500.0a/5000a or 50.00a/500.0a), th e system will stay in automatic mode, even if the zero function is activated. in other words, it could achieve real automatic operation. in automatic mode, zero function co uld not be entered fr om higher range, but it could be still activated if current range is lo wer one. this is because most residual current value is so small that the range should stay at lower one in automatic mode. when enter zero mode in lower range, the system will store the nonzero counts (residual current value). if the range goes up to higher one automatically, the non-zero c ounts will be divided by ten. so this function will still work well in automatic modes. state diagram for zero mode: original state (dcv only) ?zero? active main-display: d n+k - d n press se l > 1s press se l < 1s press se l < 1s dcv+dca press sel < 1s v2.3 10/06/25 24 ES51955(5000counts) dual display/inrush miscellaneous the conditions, which the meter turns on the buzzer, include: (1) changing measurement mode generates one beep. (2) pressing any of the push functions genera tes one beep, if the function is valid. (3) power on and re-power on generate one beep. (4) input overflow in voltage and current mode generates one beep every 0.3 seconds (or 3.33 beeps per second.) (5) continuity(diode) check generates a continuous 2khz beep whenever the measurement is less then 30 ? (30mv) (6) auto power off generates a 2khz beep which lasts for 1.5 seconds. the following figures show the output waveform from the buzout pin. 0.5 ms (a) continuous 2khz beep 0.3 sec 0.15 sec (b) 3.33 beep/sec v2.3 10/06/25 25 ES51955(5000counts) dual display/inrush 3.5. lcd panel v2.3 10/06/25 26 ES51955(5000counts) dual display/inrush lcd backplane waveform 3.1 v- + 3.6. lcd display on condition lcd annunciator condition v in voltage measurement mode, and diode measurement mode. a in current measurement mode. ? in resistance measurement mode, and continuity mode. f in capacitance measurement mode. in continuity check mode. in diode mode. % in duty cycle measurement. hz hz for frequency mode (voltage signal to freq input) hz 2 hz for aca mode (adp/ivsh/ivsl) dc in dc voltage or current mode. ac in ac voltage or current mode. auto when automatic range selection is enabled. (voltage, resistance, capacitance, frequency mode) manu in manual mode. scan when smart (resistance, continuity, diod e, capacitance auto check mode) is active. hold when hold function is enabled. inrush when inrush function is enabled. m 1 in capacitor measurement mode and the fu ll scale range is in the order of mf. 1 in capacitor measurement mode and the fu ll scale range is in the order of uf. n in capacitor measurement mode and the fu ll scale range is in the order of nf. m 2 in voltage measurement mode and the full scale range is in the order of 10 -3 . 2 in dcua current measurement mode and the full scale range is in the order of ua. m in resistance measurement mode and th e full scale range is in the order of m ? k in resistance measurement mode and th e full scale range is in the order of k ? when the reading is exceeding 30v or ol in dcv or acv, the hv warning symbol will be displayed. v- + 3.1 v- v- v- +3.1 v- +3.1 v- +3.1 v- v- v- +3.1 v- v- +3.1 v- v- +3.1 v- v2.3 10/06/25 27 ES51955(5000counts) dual display/inrush in temperature measurement mode and when the unit is H in temperature measurement mode and when the unit is H slb3 when voltage (ref. to v-) of lbat9 pin is less than vt1, slb3 will disappear. slb2 when voltage (ref. to vo) of lbat9 pin is less than vt2, slb2 will disappear. slb1 when slb2 disappears for 8 seconds, slb1 will be blinking. apo when auto power off function is enabled. v2.3 10/06/25 28 ES51955(5000counts) dual display/inrush 3.7. operating timing ES51955 incorporates a dual slope adc with four phases: zi, az, int and dint. the timing of each phase is listed below. * voltage / current / ohm / adp / temp erature (high range) measurement: phase period zi 50ms az 24ms int 100ms dint 126ms * temperature mode (low range: 500 o c mode) phase period zi 50ms az 24ms int 1000ms dint 126ms *capacitance measurement: range total measurement time 6.600nf 0.35 sec 66.00nf 0.35 sec 660.0nf 0.95 sec 6.600 f 0.7 sec 66.00 f 0.7 sec 660.0 f 1.4 sec 6.600mf 2.8 sec (max) 66.00mf 14.0 sec (max) * frequency + duty cycle mode measurement in range 500.0hz~50mhz, the measurement cycle = 1.05 sec p.s . in the frequency measurement with auto mode, if the range is changed, the internal clock rate will increase ten times and the new measurement cycle becomes 1/10 times of the original cycle until the range is stable. v2.3 10/06/25 29 ES51955(5000counts) dual display/inrush 4. application circuit 4.1 eeprom is used 1 2 3 4 56 a b c d 6 5 4 3 2 1 d c b a title number revision size b date: 8-jun-2010 sheet of file: f:\protel file\ka030.ddb drawn by : r19 10m vr1 c3 470nf r21 9k r20 1k detailed + c22 1uf c25 220pf r23 2.2k p tc r27 2k sw9 sw_rc q6 c1815 q5 c1815 close to i c c27 0 ~ 100pf c23 1nf c24 220pf c28 4.7nf sleep buzin seg23 seg22 seg21 seg20 r29 200 r25 2.2k p tc q8 c1815 q9 c1815 + c29 2.2uf seg19 seg18 seg17 seg16 seg15 seg14 seg13 seg12 seg11 seg10 seg09 seg08 seg07 seg06 seg05 seg04 seg03 seg02 seg01 bp4 bp3 bp2 bp1 alarm bzout bkout bz1 buzze r v - d3 led r6 100k v - r30 10k r31 10k bzout q12 kn2907 q11 c1815 bkout r9 100 y1 4mhz c4 0.1uf v - option_nf c_cla m p s50v svr cesel dis_dca dis_dgbp dis_lpf sel bklit inrush sac range hold fc2 fc3 fc4 fc1 lbat9 c2 470nf v - v + sw4 inrush sw6 hold sw7 range sw5 bkli t bkli t inrush range hold v - sw8 sel sel sw11 sac sw12 fc4 sw3 svr sw2 s50v fc4 sac svr s50v v - sw13 fc3 sw14 fc2 sw15 fc1 fc1 fc2 fc3 + c9 10uf + c8 10uf zr2 7.5v v + c6 0.1uf c5 0.1uf zr1 5.6v sw1 power switch v - ba t- ba t+ a0 1 a1 2 a2 3 gnd 4 sda 5 scl 6 wp 7 vcc 8 u2 24c02 r22 47k cal_en sda scl aposel q7 c1815 q10 c1815 seg24 d2 led r2 100k v - q2 c1815 alarm1 r8 100 r24 2.2k p tc r28 2k q4 c1815 q3 c1815 r26 180k c1 1 0nf adp r4 100k r3 100k ivsh ivsl c15 220nf vrh c16 100nf c13 220nf c12 220nf r13 120k r12 360k c18 47n c17 22n c19 470n c14 220nf r14 100 r15 1k r17 101k r18 1.111m r16 10.0k detailed c11 220nf c10 220nf + c20 1uf + c21 1uf ES51955_rms circuit ver:4 r5 100k r11 470k sw10 acv rms vin 1 j1 c26 0 ~ 100pf 1 j2 gnd 1 j4 fin v - dc 3.0v ado_a 1 ivsh 10 adi_a 2 test5a 3 acvla 4 acvha 5 csh+ 6 csh- 7 va- 8 raz_a 12 ivsl 9 adp 11 buf_a 13 caz_a 14 ci nt_a 15 cln_a 16 vrh 18 clp _v 19 cln_v 20 ci nt_v 21 caz_v 22 buf_v 23 raz 24 ohmc3 26 ohmc2 27 ohmc1 28 vr_a 29 ohmc4 25 dacao 30 vr 31 dacvo 32 or1 33 vr5 34 vr4 35 vr2 37 vr3 36 ovsg 38 vr1 39 acvl_v 40 acvh_v 41 adi_v 42 ado_v 43 test5v 44 sgnd 45 ca- 46 ca+ 47 r9k 48 r1k 49 ovx 50 ovh 51 lpc1 53 lpc2 54 lpc3 55 lpfout 56 sleep 57 buzin 58 freq 59 cal_en 60 sda 61 scl 62 seg23 64 seg22 65 seg21 66 seg20 67 seg19 68 seg18 69 seg17 70 seg16 71 seg15 72 seg14 73 seg13 74 seg12 75 seg11 76 seg10 77 seg09 78 seg08 79 seg07 80 seg06 81 seg05 82 seg04 83 seg03 84 seg02 85 seg01 86 bp4 87 bp3 88 bp2 89 bp1 90 alarm 91 bzout 92 bkout 93 osc1 94 osc2 95 lcdcap 96 opt_nf 97 c_cla m p 98 s50v 99 svr 100 aposel 101 cal_nf 102 cesel 103 tsel 104 alarm1 105 dis_lpf 106 disdgb 107 disdca 108 enir 109 bklit 110 sel 111 hold 112 range 113 sac 114 fc4 115 fc3 116 fc2 117 fc1 118 c- 119 c+ 120 lbat9 121 v- 122 v- 123 v+ 124 v+ 125 dgnd 126 agnd 127 agnd 128 clp _a 17 ovh1 52 seg24 63 u1 ES51955 r10 0 d1 led r1 100k v - q1 c1815 alarm r7 100 tsel alarm1 bottom ground plane trms circuit acvh_v + c33 10uf + c35 10uf + vs - vs vin 1 en 2 - vs 3 cav 4 db 5 buf out 6 buf in 7 iout 8 rl 9 common 10 nc 11 nc 12 nc 13 + vs 14 u4 es636 (bin 6) + c36 3.3uf +c38 2.2uf - vs + vs + c34 22uf adi_v r33 200k + vs acvh_a + c7 10uf + c31 10uf + vs - vs vin 1 en 2 - vs 3 cav 4 db 5 buf out 6 buf in 7 iout 8 rl 9 common 10 nc 11 nc 12 nc 13 + vs 14 u3 es636 (bin 6) + c32 3.3uf +c37 2.2uf - vs + vs + c30 22uf adi_a r32 200k + vs metallized polypropylene film capacitor : c11, c12 adi_v acvh_v adi_a acvh_a hi-z v - v - sw4 cal_en semi-auto calibrate a ctive mode to v - n ormal mode to gnd v2.3 10/06/25 30 ES51955(5000counts) dual display/inrush 4.2 eeprom is not used 1 2 3 4 56 a b c d 6 5 4 3 2 1 d c b a title number revision size b date: 20-nov-2009 sheet of file: f:\protel file\ka030.ddb drawn by : ES51955_rms circuit ver:4 r19 10m vr1 c3 470nf r21 9k r20 1k detailed + c22 1uf c25 220pf r23 2.2k ptc r27 2k sw9 sw_rc q6 c1815 q5 c1815 close to i c c27 0 ~ 100pf c23 1nf c24 220pf c28 4.7nf sleep buzin seg23 seg22 seg21 seg20 r29 200 r25 2.2k ptc q8 c1815 q9 c1815 + c29 2.2uf seg19 seg18 seg17 seg16 seg15 seg14 seg13 seg12 seg11 seg10 seg09 seg08 seg07 seg06 seg05 seg04 seg03 seg02 seg01 bp4 bp3 bp2 bp1 alarm bzout bkout bz1 buzzer v - d3 led r6 100k v - r30 10k r31 10k bzout q12 kn2907 q11 c1815 bkout r9 100 y1 4mhz c4 0.1uf v - option_nf c_cla m p s50v svr cesel dis_dca dis_dgbp dis_lpf sel bklit inrush sac range hold fc2 fc3 fc4 fc1 lbat9 c2 470nf v - v + sw4 inrush sw6 hold sw7 range sw5 bkli t bkli t inrush range hold v - sw8 sel sel sw11 sac sw12 fc4 sw3 svr sw2 s50v fc4 sac svr s50v v - sw13 fc3 sw14 fc2 sw15 fc1 fc1 fc2 fc3 trms circuit + c9 10uf + c8 10uf zr2 7.5v v + c6 0.1uf c5 0.1uf zr1 5.6v sw1 power switch v - ba t- bat+ aposel q7 c1815 q10 c1815 seg24 d2 led r2 100k v - q2 c1815 alarm1 r8 100 r24 2.2k ptc r28 2k q4 c1815 q3 c1815 c1 1 0nf adp r4 100k r3 100k ivsh ivsl c15 220nf vrh c16 100nf c13 220nf c12 220nf r13 120k r12 360k c18 47n c17 22n c19 470n c14 220nf r14 100 r15 1k r17 101k r18 1.111m r16 10.0k detailed c11 220nf c10 220nf r5 100k r11 470k sw10 acv rms vin 1 j1 c26 0 ~ 100pf 1 j2 gnd 1 j4 fin dc 3.0v ado_a 1 ivsh 10 adi_a 2 test5a 3 acvla 4 acvha 5 csh+ 6 csh- 7 va- 8 raz_a 12 ivsl 9 adp 11 buf_a 13 caz_a 14 ci nt_a 15 cln_a 16 vrh 18 clp_v 19 cln_v 20 ci nt_v 21 caz_v 22 buf_v 23 raz 24 ohmc3 26 ohmc2 27 ohmc1 28 vr_a 29 ohmc4 25 dacao 30 vr 31 dacvo 32 or1 33 vr5 34 vr4 35 vr2 37 vr3 36 ovsg 38 vr1 39 acvl_v 40 acvh_v 41 adi_v 42 ado_v 43 test5v 44 sgnd 45 ca- 46 ca+ 47 r9k 48 r1k 49 ovx 50 ovh 51 lpc1 53 lpc2 54 lpc3 55 lpfout 56 sleep 57 buzin 58 freq 59 cal_en 60 sda 61 scl 62 seg23 64 seg22 65 seg21 66 seg20 67 seg19 68 seg18 69 seg17 70 seg16 71 seg15 72 seg14 73 seg13 74 seg12 75 seg11 76 seg10 77 seg09 78 seg08 79 seg07 80 seg06 81 seg05 82 seg04 83 seg03 84 seg02 85 seg01 86 bp4 87 bp3 88 bp2 89 bp1 90 alarm 91 bzout 92 bkout 93 osc1 94 osc2 95 lcdcap 96 opt_nf 97 c_cla m p 98 s50v 99 svr 100 aposel 101 cal_nf 102 cesel 103 tsel 104 alarm1 105 dis_lpf 106 disdgb 107 disdca 108 enir 109 bklit 110 sel 111 hold 112 range 113 sac 114 fc4 115 fc3 116 fc2 117 fc1 118 c- 119 c+ 120 lbat9 121 v- 122 v- 123 v+ 124 v+ 125 dgnd 126 agnd 127 agnd 128 clp_a 17 ovh1 52 seg24 63 u1 ES51955 r10 0 d1 led r1 100k v - q1 c1815 alarm r7 100 tsel alarm1 bottom gr ound plane vr1 10k r33 27k vrh_a + c7 4.7uf vr2 10k vrh_v r22 27k r32 27k vrh_a vrh_v vrh_a metallized polyprop ylene f ilm capac itor : c 11, c12 adi_v acvh_v adi_a acvh_a r26 180k vr6 50k acvh_a + c20 10uf + c21 10uf + vs - vs vin 1 en 2 - vs 3 cav 4 db 5 buf out 6 buf in 7 iout 8 rl 9 common 10 nc 11 nc 12 nc 13 + vs 14 u2 es636 + c31 3.3uf + c34 2.2uf vr5 500k r36 10k r38 200 + vs - vs + vs - vs + c30 22uf vr3 200 adi_a acvh_v + c35 10uf + c36 10uf + vs - vs vin 1 en 2 - vs 3 cav 4 db 5 buf out 6 buf in 7 iout 8 rl 9 common 10 nc 11 nc 12 nc 13 + vs 14 u3 es636 + c33 3.3uf + c37 2.2uf vr7 500k r40 10k r41 200 + vs - vs + vs - vs + c32 22uf adi_v vr4 200 r35 200k + vs r37 200k + vs hi-z v2.3 10/06/25 31 ES51955(5000counts) dual display/inrush 5. package information 8.1 128l lqfp outline drawing 8.2 dimension parameters |
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