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SC7001Q
33/4 DIGITS LCD DISPLAY ,3260-COUNT A/D FOR DMM
DESCRIPTION
The SC7001Q is a low power CMOS dual-slope A/D converter with 3 3/4-digit numeric and 33-segment bar-graph LCD display driver, autoranging, and single 3V battery operation. It is ideal for high performance auto-range DMM applications with 3260 counts full-scale. The SC7001Q provides many user function: Manual Range Hold/Data Hold/Auto Power-off/Voltage/Current/Resistance measurement/Diode
QFP-80-14x20-0.8
Test/Continuity Check(Beeper). The built-in high temperature-stable CMOS bandgap reference and a CMOS Op Amp for ac-to-dc conversion are economical of saving external components. In addition, the voltage doubler enables a high performance digital multimer to be built with single 3V power supply operation.
ORDERING INFORMATION
Part no. SC7001Q Package QFP-80-14X20-0.8
FEATURES
* Auto range function --Voltage (DC/AC):326.0mV(NA for AC), 3.260V, 326.0V, 3260V --Resistance: 326.0,3.260k, 32.60k, 326.0k, 3.260M, 32.60 M -- Current (DC/AC): 326.0A, 3260A, 32.60mA, 326.0mA, 10A * Triplex LCD driver including decimal points, bargraph, and annunciators * Low power consumption: less than 1.8mW. * 3V battery operation. * Internal voltage doubler, ac-to-dc conversion Op Amp. * Range Selection/Display Hold/Auto Power-off/Diode Test/Continuity Check(Beeper) function * Built-in CMOS bandgap reference.
APPLICATIONS
Hand-held DMM * Pocket DMM * Pen-type DMM
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SC7001Q
BLOCK DIAGRAM
1. Analog block
2. Digital block
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SC7001Q
ABSOLUTE MAXIMUM RATING (note1)
Characteristics Supply Vltage (VDD to A COM) Supply Vltage (VSS to A COM) Digital Input Voltage Analog Input Voltage Digital Output Current Analog Output Current Beep Output Current LCD Output Current Operating Temperature Range Storage Temperature Range Symbol VDD VSS DVIN AVIN DIOUT AIOUT IBEEP ILCD TOPR TSTG Value 4 -4 -0.3~VDD+0.3 VSS-0.3~VDD+0.3 -1~+1 -3~+3 -1~+1 -0.1~+0.1 0~+50 -40~+125 Unit V V V V mA mA mA mA C C
Note: 1. All voltage are measure with respect to the A COM, unless otherwise noted. The separate A GND, D GND and A COM should always be wired together.
RECOMMENDED OPERATING CONDITIONS
Characteristics Supply voltage Supply voltage Digital input "L" voltage Digital input "H" voltage Reference input voltage LCD-ON drive voltage LCD-OFF drive voltage Operating temperature range Clock frequency Symbol VDD VSS DVIL DVIH REF IN VLCD-ON VLCD-OFF Topr f 0 32.768 2.5 1.3 50 VDD-0.5 0.32768 Value Min. 2.4 -2.4 Typ. 3.0 -3.0 Max. 3.6 -3.6 0.5 Unit V V V V V V V C KHz
ELECTRICAL CHARACTERISTICS (Tamb=25C, VDD=3V, REF IN=0.32768V, f =32.768KHz,unless
otherwise specified) Characteristics Supply current Power-off supply current Digital input "H" current Digital input "L" current Measuring pin leakage Digital input "H" voltage Digital input "L" voltage Symbol IDD IPO IIH IIL ILEAK VIH VIL Test conditions At DCV mode, VIN=0mV with voltage doubler operated At power off(down) VIH =3V VIL=0V -1.0 -10 -10 2.5 0.5 +10 0 Min. Typ. Max. 600 4.0 +1.0 Unit A A A A pA V V
(To be continued)
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SC7001Q
(Continued)
Characteristics Built-in reference voltage output range Built-in reference voltage output voltage coefficient Battery check internal comparator off-set voltage LCD-on drive voltage LCD-off drive voltage DCV measurement DCA measurement Linearity ACV measurement ACA measurement Resistance measurement Diode test Option measurement Beep out frequency Continuity check value AC-to-DC conversion Amp gain O.L display count
Symbol REF OUT
Test conditions
Min. 1.1 -2000 -60 2.5
Typ. 1.28
Max. 1.4
Unit V
REF OUT VDD=2.4~3.6V VBATT VLCD-ON VLCD-OFF ERR-DCV ERR-DCA ERR-ACV ERR-ACA ERR-R ERR-D ERR-OPT fBEEP RCC AV D O.L Input range = -1~1v Except 32.6M 32.6M range Full-scale =2.0V On pin 47 voltage
+2000 ppm/V +60 mV V 1.3 V
-0.08 -0.15 -0.1 -0.2 -0.08 -0.5 -0.2 -0.08 4095 18.3 70 3240 4096
+0.08 %/FS +0.15 %/FS +0.1 +0.2 %/FS %/FS
+0.08 %/FS +0.5 +0.2 %/FS %/FS
+0.08 %/FS 4097 20.7 Hz dB 3290 count
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SC7001Q
PIN CONFIGURATION
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SC7001Q
PIN DESCRIPTION
PIN No. 1 2~27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 Symbol BP1 SDP1~SDP26 LOWBAT PWRMON AUTO PWR1 AUTO PWR2 VDD CINTH CAUTO ZERO(H) RINTH(H) RINTH(L) A COM REF IN AC AMP OUT AC AMP IN(-) AC CKT IN (+) CFILT OUT CFILT IN AC CKT IN(-) A GND NC REF OUT CINTL CAUTO ZERO(L) RINTL(L) RINTL(H) R MEAS IN D MEAS IN I MEAS IN V MEAS IN 1.1111M 101.01K 10.010 K 1.0001K 10.000M RREF COM VSS Backplane 1 of LCD display Segment display Low battery check voltage input Power monitor output Auto power ON/OFF selection 1 Auto power ON/OFF selection 2 Supply voltage High-speed A/D integrating capacitor connection High-speed A/D auto zero capacitor connection High-speed A/D integrating resistor connection(H) High-speed A/D integrating resistor connection(L) Analog circuit reference voltage Reference voltage input Built-in AC Amp output Built-in AC Amp negative input AC measurement position input Output pin for external filter Input pin for external filter AC measurement negative input Analog ground No connection. This pin should be open in normal operation Built -in bandgap reference voltage output Low-speed A/D integrating capacitor connection Low-speed A/D auto zero capacitor connection Low-speed A/D integrating resistor connection (L) Low-speed A/D integrating resistor connection (H) Resistor and current measurement input Diode and current of high range measurement pin Input for current measurement Input for voltage measurement Voltage measurement / 10 attenuator(326.0k range) Voltage measurement / 100 attenuator(32.60k range) Voltage measurement / 1000 attenuator(3.260k range) Voltage measurement / 1000 attenuator(326.0 range) Resistance measurement 3.260M range Attenuator resistor common connection Negative supply voltage connection of analog circuit
(To be continued)
Description
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SC7001Q
(Continued)
PIN No. 63 64~72 73 74 75 76 77 78 79 80
Symbol D GND F1~F9 CVD OUT CVD(-) CVD(+) OUT OSC OUT OSC IN BP2 BP3 Digital ground Function input pin 1~9 Voltage double output
Description
Voltage double capacitor connection (-) Voltage double capacitor connection(+) Beep frequency output (4096Hz) X-tal connection (32.768KHz) X-tal connection Backplane 2 of LCD display Backplane 3 of LCD display
FUNCTIONAL DESCRIPTION
1. SC7001Q INTEGRATING DUAL-SLOPE A/D CONVERTER The SC7001Q consists of a low-speed A/D and a high-speed A/D conversion circuit. Low-speed A/D conversion circuit When an analog DC input signal under 320mV is applied, the low-speed conversion proceeds like a sequence of AUTO ZERO (A.Z)INTEGRATION (INT) DEINTEGRATION (DEINT) AUTO ZERO. One conversion takes 519.7ms is the voltage measurement mode. The counter data of DEINTEGRATION interval is transferred to the LCD and the output value is determined. High-speed A/D conversion circuit Range selection and barograph display operate by the high-speed conversion which is like that of low-speed A/D conversion. One conversion takes 80ms in the voltage measurement mode.
Waveform and block diagram of dual-slope A/D converter (Negative input) Conversion time Tim Speed Low-speed A/D High-speed A/D T1 100ms 40ms T2 200ms 20ms T3 219.7ms(109.8ms)* 20ms(10ms) Conversion time T1+T2+T3 519.7ms(409.8ms) 80ms(70ms)
* : The value of parenthesis is for current measurement mode.
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SC7001Q
2. VOLTAGE MEASUREMENT In the voltage measurement mode, input impedance is very high because input signal is applied to the integrator through a internal buffer amplifier. Ranges are automatically changed by internal switch select a proper route and attenuate an unknown voltage input to the ratio of 1/1, 1/10, 1/100, 1/1000, 1/10000. 1.1111M, 101.10K, and 1.0001K of attenuator resistors are connected to 10M resistor tandemly. Range 326.0(R1) 3.260(R2) 32.60(R3) 326.0(R4) 3260(R15) Attenuator (in tandem) 10 10M&1.1111M 10M&101.01K 10M&10.01K 10M&1.0001K Attenuation ratio 1 1/10 1/100 1/1000 1/10000 Resolution 0.1mV 1 mV 10 mV 100 mV 1V
Counter INT DEINT 3277 3600
Timer 200.0ms 219.7ms
Rint 327k 327 k
Vout (Vin * Tint)/(R * Cint) VOUT-(Vref *Tdeint)/(R* Cint)
3. CURRENT MEASUREMENT Input terminals consist of A, mA, and 10A ranges consist of two auto ranges according to the level of the input. Input terminal A mA 10A Range 326.0A 3260A 32.60 mA 326.0 mA 10A Internal switch S
S
Attenuation ratio 1 1/10 1 1/10
Resolution 0.1A 1A 10A 1A
S
S
S
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SC7001Q
Counter INT DEINT 3277 3600
Timer 200.0ms 109.8ms
Rint 327k 327k
Vout VOUT-(Vref *Tdeint/2)/(R* Cint)
4.RESISTANCE CONTINUITY MEASUREMENT In the resistance measurement mode, each attenuation resistor is connected to a 10M resistor parallelly.
10M
s 1.28V REF IN R MEAS IN Rk 1K
100K
INT 900K
DEINT
DUAL SLOPE A/D
Rx
Range Resistance Except 32.60M 32.60 M Continuity 5. DIODE TEST INT DEINT INT DEINT
Counter 3277 3600 3050 3600
Time 200.0ms 129.7ms 186.0ms 219.7ms
Rint 327 k 1 M 1 M 327 k
Same as 326.0 range
In the diode test mode, if an input voltage is over 2.01V(201counts) then "O.L" is displayed in the LCD and any more measurement is impossible.
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SC7001Q
FUNCTION AND RANGE TABLE
1. When F5=0 No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 F2 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 F1 0 0 0 0 1 1 1 1 0 0 0 1 1 1 1 F4 0 0 1 1 0 0 1 1 0 1 1 0 0 1 1 F3 0 1 0 1 0 1 0 1 0 0 1 0 1 0 1 F9=1/ F9=0 DC/AC VOLT DC/AC VOLT DC/AC VOLT OHM/Contiuity OPTION only DC VOLT DC VOLT Contiuity /Diode LCD test CD/AC VOLT OHM OPTION DC/AC mA DC/AC A DC/AC VOLT x * * * x x x * x * * * x x x * x * * * x * x * x * * * x * * * x * * * x x * * x x * x x x x x F6=1 F6=0 326m VOLT R1, DP1 * * * * x * * R2, DP3 * * * * x * * R3, DP2 * * * x x * * R4, DP1 * * * x x * * R5, DP3 * * * x x * * R32M, DP2 x x x x x x x F9=1, F7:T Display 1999 F8=0,F9:T 326m VOLT Remark TPD
* R1~R5: Range 1~Range 5. * R32M: R32M is 32M range of resistance measurement. * DP1~DP3: Dot point 1, 2, 3 on the LCD. * F7: Manual Range Hold (to release `RH', F7=0 during over 1sec). * F8: Data Hold (by toggling). * F5: Mode can be changed by a toggle switch with F9 (F9=10) when F5=0. Mode can be changed by a touch switch with F9 (F9=101). * TPD: Auto power off time (10 minutes). * F1~F9: Initial state using internal pull up (DC 326.0mV Range) . So every function pin (F1~F9) is "1" state unless certain input is given. * T: Toggle. 2. When F5=1 No 16 17 18 19 F2 0 0 0 0 F1 0 0 0 0 F4 0 0 1 1 F3 0 1 0 1 F9=1/ F9=0 DC/AC VOLT DC/AC VOLT DC/AC VOLT OHM CONTINUITY DIODE 20 0 1 1 1 CONTINUITY DIODE R1, DP1 * * * * * x * x R2, DP3 * * * * x * x * R3, DP2 * * * * x x x x R4, DP1 * * * * x x x x R5, DP3 * * * * x x x x R32M, DP2 x x x * x x x x F9:T F9:T F9:T Remark TPD
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SC7001Q
3. Auto power off function Power turned off by 10 minutes unless input value changed within a defined time. * This function selected as follows. Auto PWR1(Pin30) + Auto PWR2(PIN31) POWER 0+0 Power on 1+0 Auto power off 0+1 Off 1+1 Off
4.Full display value according to mode Mode Voltage DC AC Current (AC/CD) mA A 326.0 3.260K 32.60K R1 326.0mV R2 3.260V 3.260V R3 32.60V 32.60V 32.60mA R4 326.0V 326.0V 326.0mA 326.0A 326.0K 3260A 3.260M 32.60M R5 3260V 3260V R32M
Resistance()
DP3 of R4 is not displayed under voltage, current mode.
LCD DRIVE WAVEFORM
BACKPLANE 1
BACKPLANE 2
3V
BACKPLANE 3
2V 1V D GND
SEGMENT ON
3V
D GND
256/6=42.67Hz
2V
SEGMENT OFF
1V
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SC7001Q
LCD DISPLAY
AC D-H DC
p0 pdp3 dp2 dp1
R-H mV MK
p33
TRIPLEXED LCD DISPLAY FORMAT
IC PIN BP NO BP2 BP3 BP1 NO 79 80 1 IC PIN BP NO BP2 BP3 BP1 NO 79 80 1 d3 e3 a3, g3 AC D-H DC p27 p26 p25 p22 p23 p24 p21 p20 p19 p16 p17 p18 p15 p14 p13 p10 p11 p12 p9 p8 p7 p4 p5 p6 p3 p2 p1 pp0 15 16 17 18 19 20 21 22 23 24 25 26 27 p31 p32 p33 V R-H K M m c0 b0 d0 g0 a0 p30 e0 f0 dp1 c1 b1 d1 g1 a1 p29 e1 f1 dp2 c2 b2 d2 g2 a2 p28 e2 f2 dp3 c3 b3 2 3 4 5 6 7 8 9 10 11 12 13 14
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SC7001Q
TYPICAL APPLICATION CIRCUIT
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SC7001Q
COMPONENT VALUE
No R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R27 R28 R32 R33 R34 R36 R37 Value 9900 909 100 900 1.1 101.01 10.01 1.001 10 100 470 0.1 100 160 150 324 1 8.2 100 10 10 100 50 150 39 495 4.995 324 990 Unit K K K K M K K K M K K M K VR1 K K K M K K K K K K K K K Z1 ZENAMIC 220 Q1 Q2 Q3 X-Tal C2500 C2500 C945 32768 Hz D1 D2 D3 D4 D5 D6 D7 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 VR2 VR3 20 200 500 K K No C1 C2 C3 C4 C5 C7 C8 C9 C10 C11 C12 C13 C14 Value 0.022 0.022 10 10 10 0.015 0.22 10 0.1 0.0068 0.15 1 10 Unit F F F F pF F F F F F F F F
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SC7001Q
TEST CIRCUIT
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SC7001Q
PACKAGE OUTLINE
QFP-80-14x20-0.8 UNIT: mm
23.90.4 20.00.2 3.35MAX 0.80.2 0.05MIN 16.30.4 17.90.4 14.00.2 1 0.35 0.80 12.0 0.150.05
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: * Persons at a work bench should be earthed via a wrist strap. * Equipment cases should be earthed. * All tools used during assembly, including soldering tools and solder baths, must be earthed. * MOS devices should be packed for dispatch in antistatic/conductive containers.
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