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ht1670 128 32 lcd controller for i/o mcu patented pat no. : 099352 rev. 1.60 1 november 9, 2010 features operating voltage: 2.7v~5.2v built-in 32khz rc oscillator external 32.768khz crystal oscillator or 32khz fre - quency source input standby current: <1 a at 3v, <2 aat5v internal resistor type: 1/6 bias or 1/5 bias, 1/32 duty, and 1/16 duty three selectable lcd frame frequencies: 64hz, 89hz or 170hz max. 128 32 patterns, 128 segments and 32 com- mons 144 segments and 16 commons selectable by com- mand method built-in bit-map display ram: 4096 bits (=128 32 bits) built-in internal resistor type bias generator six-wire interface (four data wires) eight kinds of time base/wdt selection time base or wdt overflow output r/w address auto increment built-in buzzer driver (2khz/4khz) power down command reduces power consumption software configuration feature data mode and command mode instructions three data accessing modes provides vlcd pin to adjust lcd operating voltage and max. vlcd voltage up to 7v provides three kinds of bias current programming control of tn-type and stn-type lcds 208-pin qfp package general description ht1670 is a peripheral device specially designed for i/o type mcu used to expand the display capability. the max. display segment of the device are 4096 patterns (128 segments and 32 commons). it also supports four data bits interface, buzzer sound, watchdog timer or time base timer functions. the ht1670 is a memory mapping and multi-function lcd controller. since the ht1670 can control tn-type (twisted nematic) or stn-type (super twisted nematic) lcds. the software configuration feature of the ht1670 make it suitable for multiple lcd applications including lcd modules and display subsystems. only six lines (cs ,wr , db0~db3) are required for the interface between the host controller and the ht1670. applications leisure products games personal digital assistant cellular phone global positioning system consumer electronics technical document tools information faqs application note
block diagram pin assignment ht1670 rev. 1.60 2 november 9, 2010 patented

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pad assignment chip size: 4620 5305 (m) 2 * the ic substrate should be connected to vss in the pcb layout artwork. pad coordinates unit: m pad no. x y pad no. x y pad no. x y 1 2203.000 2546.300 62 697.300 2463.250 123 2203.000 969.550 2 2203.000 2413.950 63 602.300 2463.250 124 2203.000 1064.550 3 2203.000 2293.950 64 496.700 2463.250 125 2203.000 1159.550 ht1670 rev. 1.60 3 november 9, 2010 patented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
pad no. x y pad no. x y pad no. x y 4 2203.000 2173.950 65 401.700 2463.250 126 2203.000 1254.550 5 2203.000 2053.950 66 292.850 2463.250 127 2203.000 1349.550 6 2203.000 1933.950 67 179.350 2434.850 128 2203.000 1444.550 7 2203.000 1827.850 68 79.050 2434.850 129 2203.000 1539.550 8 2203.000 1732.850 69 17.950 2434.850 130 2203.000 1634.550 9 2203.000 1637.850 70 113.100 2434.850 131 2203.000 1729.550 10 2203.000 1542.850 71 505.400 2447.250 132 2203.000 1824.550 11 2203.000 1447.850 72 611.000 2447.250 133 2203.000 1930.650 12 2203.000 1352.850 73 706.000 2447.250 134 2203.000 2050.650 13 2203.000 1257.850 74 842.450 2432.500 135 2203.000 2170.650 14 2203.000 1162.850 75 956.050 2432.500 136 2203.000 2290.650 15 2203.000 1067.850 76 1069.650 2432.500 137 2203.000 2410.650 16 2203.000 972.850 77 1183.250 2432.500 138 2203.000 2546.300 17 2203.000 877.850 78 1296.850 2432.500 139 2043.000 2546.300 18 2203.000 782.850 79 1420.400 2432.500 140 1910.000 2546.300 19 2203.000 687.850 80 1558.700 2546.350 141 1815.000 2546.300 20 2203.000 592.850 81 1653.700 2546.350 142 1720.000 2546.300 21 2203.000 497.850 82 1748.700 2546.350 143 1625.000 2546.300 22 2203.000 402.850 83 1843.700 2546.350 144 1530.000 2546.300 23 2203.000 307.850 84 1950.650 2546.350 145 1435.000 2546.300 24 2203.000 212.850 85 2058.700 2546.350 146 1340.000 2546.300 25 2203.000 117.850 86 2203.000 2546.350 147 1245.000 2546.300 26 2203.000 22.850 87 2203.000 2451.350 148 1150.000 2546.300 27 2203.000 72.150 88 2203.000 2356.350 149 1055.000 2546.300 28 2203.000 167.150 89 2203.000 2261.350 150 960.000 2546.300 29 2203.000 262.150 90 2203.000 2165.450 151 865.000 2546.300 30 2203.000 357.150 91 2203.000 2070.450 152 770.000 2546.300 31 2203.000 452.150 92 2203.000 1975.450 153 675.000 2546.300 32 2203.000 547.150 93 2203.000 1880.450 154 580.000 2546.300 33 2203.000 642.150 94 2203.000 1785.450 155 485.000 2546.300 34 2203.000 737.150 95 2203.000 1695.450 156 390.000 2546.300 35 2203.000 832.150 96 2203.000 1595.450 157 295.000 2546.300 36 2203.000 927.150 97 2203.000 1500.450 158 200.000 2546.300 37 2203.000 1022.150 98 2203.000 1405.450 159 105.000 2546.300 38 2203.000 1117.150 99 2203.000 1310.450 160 10.000 2546.300 39 2203.000 1212.150 100 2203.000 1215.450 161 85.000 2546.300 40 2203.000 1307.150 101 2203.000 1120.450 162 180.000 2546.300 41 2203.000 1402.150 102 2203.000 1025.450 163 275.000 2546.300 42 2203.000 1497.150 103 2203.000 930.450 164 370.000 2546.300 43 2203.000 1592.150 104 2203.000 835.450 165 465.000 2546.300 44 2203.000 1687.150 105 2203.000 740.450 166 560.000 2546.300 45 2203.000 1782.150 106 2203.000 645.450 167 655.000 2546.300 46 2203.000 1877.150 107 2203.000 550.450 168 750.000 2546.300 47 2203.000 1972.150 108 2203.000 455.450 169 845.000 2546.300 48 2203.000 2067.150 109 2203.000 360.450 170 940.000 2546.300 49 2203.000 2162.150 110 2203.000 265.450 171 1035.000 2546.300 50 2203.000 2257.150 1 11 2203.000 170.450 172 1130.000 2546.300 51 2203.000 2352.150 112 2203.000 75.450 173 1225.000 2546.300 52 2203.000 2447.150 113 2203.000 19.550 174 1320.000 2546.300 53 2203.000 2542.150 114 2203.000 114.550 175 1415.000 2546.300 54 1521.950 2546.350 115 2203.000 209.550 176 1510.000 2546.300 55 1426.950 2546.350 116 2203.000 304.550 177 1605.000 2546.300 56 1331.950 2546.350 117 2203.000 399.550 178 1700.000 2546.300 57 1236.950 2546.350 118 2203.000 494.550 179 1795.000 2546.300 58 1141.950 2546.350 119 2203.000 589.550 180 1890.000 2546.300 59 1003.500 2463.250 120 2203.000 684.550 181 2043.000 2546.300 60 897.900 2463.250 121 2203.000 779.550 61 802.900 2463.250 122 2203.000 874.550 ht1670 rev. 1.60 4 november 9, 2010 patented
pad description pad no. pad name i/o description 1~42 96~181 seg86~seg127 seg0~seg85 o lcd segment outputs 43~58 80~95 com31~com16 com0~com15 o lcd common outputs, under 144 16 command mode, com16~com31 will share to seg128~seg143. com31/seg128, com30/seg129, com29/ seg130....., com18/seg141, com17/seg142, com16/seg143 59 cs i chip selection input with pull-high resistor. when the cs is logic high, the data and command read from or write to the ht1670 are disabled. the serial interface circuit is also reset. but if the cs is at a logic low level and is input to the cs pad, the data and command transmission between the host controller and the ht1670 are all enabled. 60 rd i read clock input with pull-high resistor. data in the ram of the ht1670 are clocked out on the falling edge of the rd signal. the clocked out data will ap - pear on the data line. the host controller can use the next rising edge to latch the clocked out data. 61 wr i write clock input with pull-high resistor. data on the data line are latched into the ht1670 on the rising edge of the wr signal. 62~65 db0~db3 i/o parallel data input/output with a pull-high resistor 66 vss negative power supply for logic circuit, ground 67 68 osci osco i o the osci and osco pads are connected to a 32.768khz crystal in order to generate a system clock. if the system clock comes from an external clock source, the external clock source should be connected to the osci pad. but if an on-chip rc oscillator is selected, the osci and osco pads can be left open. 69 vdd positive power supply for logic circuit 70, 79 vlcd i power supply for lcd driver circuit 71 irq o time base or watchdog timer overflow flag, nmos open drain output. 72, 73 bz, bz o 2khz or 4khz frequency output pair (tristate output buffer) 74~78 t1~t4, t000 i vary bias current pin it is usually not connected absolute maximum ratings supply voltage ...........................v ss 0.3v to v ss +5.5v storage temperature ............................ 50 cto125 c input voltage.............................v ss 0.3v to v dd +0.3v operating temperature........................... 25 cto75 c note: these are stress ratings only. stresses exceeding the range specified under absolute maximum ratings may cause substantial damage to the device. functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. ht1670 rev. 1.60 5 november 9, 2010 patented
d.c. characteristics ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v dd operating voltage 2.7 5.2 v i dd1 operating current 3v no load/lcd on on-chip rc oscillator 150 250 a 5v 250 370 a i dd2 operating current 3v no load/lcd on crystal oscillator 135 200 a 5v 200 300 a i dd11 operating current 3v no load/lcd off on-chip rc oscillator 15 30 a 5v 50 70 a i dd22 operating current 3v no load/lcd off crystal oscillator 210 a 5v 310 a i stb standby current 3v no load, power down mode 1 a 5v 2 a v il input low voltage 3v db0~db3, wr ,cs ,rd 0 0.6 v 5v 0 1.0 v v ih input high voltage 3v db0~db3, wr ,cs ,rd 2.4 3v 5v 4.0 5v i ol1 bz, bz , irq sink current 3v v ol =0.3v 1.2 2.5 ma 5v v ol =0.5v 36 ma i oh1 bz, bz source current 3v v oh =2.7v 0.9 1.8 ma 5v v oh =4.5v 2 4 ma i ol2 db0~db3 sink current 3v v ol =0.3v 1.2 2.5 ma 5v v ol =0.5v 36 ma i oh2 db0~db3 source current 3v v oh =2.7v 0.9 1.8 ma 5v v oh =4.5v 2 4 ma i ol3 lcd common sink current 3v v ol =0.3v 80 160 a 5v v ol =0.5v 180 360 a i oh3 lcd common source current 3v v oh =2.7v 40 80 a 5v v oh =4.5v 90 180 a i ol4 lcd segment sink current 3v v ol =0.3v 50 100 a 5v v ol =0.5v 120 240 a i oh4 lcd segment source current 3v v oh =2.7v 30 60 a 5v v oh =4.5v 70 140 a r ph pull-high resistor 3v db0~db3, wr ,cs ,rd 150 250 410 k 5v 60 125 210 k ht1670 rev. 1.60 6 november 9, 2010 patented
a.c. characteristics ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions f sys1 system clock 5v on-chip rc oscillator 24 32 40 khz f sys2 system clock crystal oscillator 32768 hz f sys3 system clock external clock source 32768 hz f lcd1 lcd frame frequency 5v on-chip rc oscillator 61/117 89/170 111/213 hz f lcd2 lcd frame frequency crystal oscillator 64 hz f lcd3 lcd frame frequency external clock source 64 hz t com lcd common period n: number of com n/f lcd sec f clk1 4-bit data clock (wr pin) 3v duty cycle 50% 150 khz 5v 300 khz f clk2 4-bit data clock (rd pin) 3v duty cycle 50% 75 khz 5v 150 khz t cs 4-bit interface reset pulse width (figure 3) cs 150 250 ns t clk wr ,rd input pulse width (figure 1) 3v write mode 3.34 s read mode 6.67 5v write mode 1.67 s read mode 3.34 t r ,t f rise/fall time serial data clock width (figure 1) 120 160 ns t su setup time for data to wr , rd clock width (figure 2) 80 120 ns t h hold time for data to wr , rd clock width (figure 2) 60 120 ns t su1 setup time for cs to wr , rd clock width (figure 3) 50 100 ns t h1 hold time for cs to wr , rd clock width (figure 3) 50 100 ns f tone2k tone frequency 5v on-chip rc oscillator 1.5 2.0 2.5 khz f tone4k tone frequency 5v on-chip rc oscillato 3.0 4.0 5.0 khz ht1670 rev. 1.60 7 november 9, 2010 patented
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2 & & " . . figure 3 functional description system oscillator the ht1670 system clock is used to generate the time base/watchdog timer (wdt) clock frequency, lcd driving clock, and tone frequency. the clock source may be from an on-chip rc oscillator (32khz), a crystal oscillator (32.768khz), or an external 32khz clock by the s/w setting. the configuration of the system oscilla - tor is as shown. after the sys dis command is exe- cuted, the system clock will stop and the lcd bias generator will turn off. that command is available only for the on-chip rc oscillator or for the crystal oscillator. once the system clock stops, the lcd display will be- come blank, and the time base/wdt loses its function as well. the lcd off command is used to turn the lcd bias generator off. after the lcd bias generator switches off by issuing the lcd off command, using the sys dis command reduces power consumption, thus serving as a system power down command. but if the external clock source is chosen as the system clock, using the sys dis command can neither turn the oscillator off nor carry out the power down mode. the crystal oscillator option can be applied to connect an external frequency source of 32khz to the osci pin. in this case, the sys- tem fails to enter the power down mode, similar to the case in the external 32khz clock source operation. at the initial system power on, the ht1670 is at the sys dis state. ! " # ! " !
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ht1670 rev. 1.60 9 november 9, 2010 patented display memory ram structure the static display ram is organized into 1024 4 bits and stores the display data. the contents of the ram are directly mapped to the contents of the lcd driver. data in the ram can be accessed by the read, write and read-modify-write commands. the following is a mapping from the ram to the lcd patterns. 00h 08h 10h 18h 20h--------- 3d8h 3e0h 3e8h 3f0h 3f8h com0 bit0 bit0 bit0 bit0 bit0 bit0 com1 bit1 bit1 bit1 bit1 bit1 bit1 com2 bit2 bit2 bit2 bit2 bit2 bit2 com3 bit3 bit3 bit3 bit3 bit3 bit3 01h 09h 11h 19h 21h--------- 3d9h 3e1h 3e9h 3f1h 3f9h com4 bit0 bit0 bit0 bit0 bit0 bit0 com5 bit1 bit1 bit1 bit1 bit1 bit1 com6 bit2 bit2 bit2 bit2 bit2 bit2 com7 bit3 bit3 bit3 bit3 bit3 bit3 02h 0ah 12h 1ah 22h--------- 3dah 3e2h 3eah 3f2h 3fah com8 bit0 bit0 bit0 bit0 bit0 bit0 com9 bit1 bit1 bit1 bit1 bit1 bit1 com10 bit2 bit2 bit2 bit2 bit2 bit2 com11 bit3 bit3 bit3 bit3 bit3 bit3 03h 0bh 13h 1bh 23h--------- 3dbh 3e3h 3ebh 3f3h 3fbh com12 bit0 bit0 bit0 bit0 bit0 bit0 com13 bit1 bit1 bit1 bit1 bit1 bit1 com14 bit2 bit2 bit2 bit2 bit2 bit2 com15 bit3 bit3 bit3 bit3 bit3 bit3 04h 0ch 14h 1ch 24h--------- 3dch 3e4h 3ech 3f4h 3fch com16 bit0 bit0 bit0 bit0 bit0 bit0 com17 bit1 bit1 bit1 bit1 bit1 bit1 com18 bit2 bit2 bit2 bit2 bit2 bit2 com19 bit3 bit3 bit3 bit3 bit3 bit3 05h 0dh 15h 1dh 25h--------- 3ddh 3e5h 3edh 3f5h 3fdh com20 bit0 bit0 bit0 bit0 bit0 bit0 com21 bit1 bit1 bit1 bit1 bit1 bit1 com22 bit2 bit2 bit2 bit2 bit2 bit2 com23 bit3 bit3 bit3 bit3 bit3 bit3 06h 0eh 16h 1eh 26h--------- 3deh 3e6h 3eeh 3f6h 3feh com24 bit0 bit0 bit0 bit0 bit0 bit0 com25 bit1 bit1 bit1 bit1 bit1 bit1 com26 bit2 bit2 bit2 bit2 bit2 bit2 com27 bit3 bit3 bit3 bit3 bit3 bit3 07h 0fh 17h 1fh 27h--------- 3dfh 3e7h 3efh 3f7h 3ffh com28 bit0 bit0 bit0 bit0 bit0 bit0 com29 bit1 bit1 bit1 bit1 bit1 bit1 com30 bit2 bit2 bit2 bit2 bit2 bit2 com31 bit3 bit3 bit3 bit3 bit3 bit3 seg0 seg1 seg2 seg3 seg124 seg125 seg126 seg127 128 32 selection mode ram mapping table
ht1670 rev. 1.60 10 november 9, 2010 patented 00h 04h 08h 0ch 10h--------- 22ch 230h 234h 238h 23ch com0 bit0 bit0 bit0 bit0 bit0 bit0 com1 bit1 bit1 bit1 bit1 bit1 bit1 com2 bit2 bit2 bit2 bit2 bit2 bit2 com3 bit3 bit3 bit3 bit3 bit3 bit3 01h 05h 09h 0dh 11h--------- 22dh 231h 235h 239h 23dh com4 bit0 bit0 bit0 bit0 bit0 bit0 com5 bit1 bit1 bit1 bit1 bit1 bit1 com6 bit2 bit2 bit2 bit2 bit2 bit2 com7 bit3 bit3 bit3 bit3 bit3 bit3 02h 06h 0ah 0eh 12h--------- 22eh 232h 236h 23ah 23eh com8 bit0 bit0 bit0 bit0 bit0 bit0 com9 bit1 bit1 bit1 bit1 bit1 bit1 com10 bit2 bit2 bit2 bit2 bit2 bit2 com11 bit3 bit3 bit3 bit3 bit3 bit3 03h 07h 0bh 0fh 13h--------- 22fh 233h 237h 23bh 23fh com12 bit0 bit0 bit0 bit0 bit0 bit0 com13 bit1 bit1 bit1 bit1 bit1 bit1 com14 bit2 bit2 bit2 bit2 bit2 bit2 com15 bit3 bit3 bit3 bit3 bit3 bit3 seg0 seg1 seg2 seg3 seg140 seg141 seg142 seg143 144 16 selection mode ram mapping table name command code function 144 16 mode x100 -0001-1111-xxxx change segment from 144 to 96 and common from 32 to 16 the default value after power on reset is 128 32 mode, set normal command will change 144 16 mode to 12832 mode. frame frequency ht1670 provides three kinds of frame frequency option by command code; 64hz, 89hz and 170hz respectively. frame 64hz provides 64hz frame frequency. frame 89hz provides 89hz frame frequency. frame 170hz provides 170hz frame frequency. name command code function frame 170hz x 100 -0001-1000-xxxx select 170hz frame frequency frame 89hz x 100 -0001-1101-xxxx select 89hz frame frequency frame 64hz x 100 -0001-1110-xxxx select 64hz frame frequency frame frequency selection command code time base and watchdog timer wdt the time base generator and wdt share the same counter which is divided by 256. the irq clock can be programmed as 1hz, 2hz, ...., 128hz output. timer dis/en/clr, wdt dis/en/clr and irq en/dis are independent from each other. once the wdt time-out occurs, the irq pin will remain at a logic low level until the clr wdt or the irq dis command is issued. if an external clock is selected as the system frequency source, the sys dis command turns out invalid and the power down mode fails to be carried out until the external clock source is removed.
ht1670 rev. 1.60 11 november 9, 2010 patented buzzer tone output a simple tone generator is implemented in the ht1670. the tone generator can output a pair of differential driv - ing signals on the bz and bz which are used to generate a single tone. by executing the tone 4k and tone 2k commands there are two tone frequency outputs selectable that can turn on the tone output. the tone 4k and tone 2k commands set the tone frequency to 4khz and 2khz, re - spectively. the tone output can be turned off by invoking the tone off command. the tone outputs, namely bz and bz , are a pair of differential driving outputs used to drive a piezo buzzer. once the system is disabled or the tone output is inhibited, the bz and the bz outputs will remain at low level. command format the ht1670 can be configured by software setting. there are two mode commands to configure the ht1670 resource and to transfer the lcd display data. the configuration mode of the ht1670 is called com - mand mode, and its command mode id is 100. the command mode consists of a system configuration command, a system frequency selection command, an lcd configuration command, a tone frequency selec - tion command, a bias current selection command, a timer/wdt setting command, and an operating com - mand. the data mode, on the other hand, includes read, write, and read-modify-write opera - tions. the following are the data mode id and the command mode id: operation mode id read data 110 write data 101 read-modify-write data 101 command command 100 if successive commands have been issued, the com - mand mode id can be omitted. while the system is op - erating in the non-successive command or the non-successive address data mode, the cs pin should be set to 1 and the previous operation mode will also be reset. the cs pin returns to 0 , so a new operation mode id should be issued first.
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' / # " time base and wdt configurations name command code function tone off x100 -0000-1000-xxxx turn-off tone output tone 4k x100 -0001-0000-xxxx turn-on tone output, tone frequency is 4khz tone 2k x100 -0001-0001-xxxx turn-on tone output, tone frequency is 2khz buzzer tone output command code the following are the data mode id and the command id: operation mode id read data 110 write data 101 read-modify-write data 101 command command 100 if successive commands have been issued, the command mode id can be omitted. while the system is operating in the non-successive address data mode, the cs pin should be set 1 and the previous operation mode will also be reset. the cs pin returns to 0, so a new operation mode id should be issued first.
ht1670 rev. 1.60 12 november 9, 2010 patented bias generator the ht1670 bias voltage belongs to internal resistor type. it provides two kinds of bias option named 1/6 bias and 1/5 bias respectively. it also provides three kinds of bias current option by programming to suitably drive an lcd panel. the three kinds of bias current are large, middle, and small, respectively. usually, large panel lcd can be excellently displayed by large bias current. relatively, it consumes large current when lcd on command is used. small bias current provides low power consumption during on condition when the lcd is normally displayed. the following are the reference value table. when the bias current for lcd is more than large bias current setting. it is recommended to add external cir - cuit to increase driving current. interfacing only six lines are required to interface with the ht1670. the cs line is used to initialize the serial interface circuit and to terminate the communication between the host controller and the ht1670. if the cs pin is set to 1, the data and command issued between the host controller and the ht1670 are first disabled and then initialized. before issuing a mode command or mode switching, a high level pulse is required to initialize the serial inter - face of the ht1670. the db0~db3 are the 4-bit parallel data input/output lines. data to be read or written or commands to be written have to pass through the db0~db3 lines. the rd line is the read clock input. data in the ram are clocked out on the falling edge of the rd signal, and the clocked out data will then appear on the db0~db3 lines. it is recommended that the host controller read correct data during the interval between the rising edge and the next falling edge of the rd signal. the wr line is the write clock input. the data, ad - dress, and command on the db0~db3 lines are all clocked into the ht1670 on the rising edge of the wr signal. there is an optional irq line to be used as an in - terface between the host controller and the ht1670. the irq pin can be selected as a timer output or a wdt overflow flag output by the s/w setting. the host con - troller can perform the time base or the wdt function by connecting with the irq pin of the ht1670. bias vlcd large bias current middle bias current small bias current 1/5 3v 165a7 0 a3 0 a 5v 270a 110a5 0 a 1/6 3v 140a5 5 a2 5 a 5v 225a9 0 a4 0 a

internal resistor type bias generator configurations note: the voltage applied to v lcd pin must be equal to or lower than 7v. adjust vr to fit lcd display.
timing diagrams read mode (command id code :110) ht1670 rev. 1.60 13 november 9, 2010 patented & 7
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t care application circuits host controller with an ht1670 display system *note: the connection of irq and rd pin can be selected depending on the mcu. adjust vr to fit lcd display adjust r (external pull-high resistance) to fit user
s time base clock. it is recommended that the internal equivalent capacitance between seg and com of lcd panel should be lower than 10pf. (lcr meter test condition: frequency in 1khz) ht1670 rev. 1.60 15 november 9, 2010 patented % " f f ) % ( & & 8 ( f & $ $ $ 7 & f $ $
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instruction set summary name command code d/c function def. read x110-xxa9a8-a7a6a5a4-a3a2a1a0- d3d2d1d0 d read data from the ram write x101-xxa9a8-a7a6a5a4-a3a2a1a0- d3d2d1d0 d write data to the ram read-modify- write x101-xxa9a8-a7a6a5a4-a3a2a1a0- d3d2d1d0 d read and write data to the ram sys dis x100-0000-0000-xxxx-xxxx c turn off both system oscillator and lcd bias generator yes sys en x100-0000-0001-xxxx-xxxx c turn on system oscillator lcd off x100-0000-0010-xxxx-xxxx c turn off lcd display yes lcd on x100-0000-0011-xxxx-xxxx c turn on lcd display timer dis x100-0000-0100-xxxx-xxxx c disable time base output yes wdt dis x100-0000-0101-xxxx-xxxx c disable wdt time-out flag output yes timer en x100-0000-0110-xxxx-xxxx c enable time base output wdt en x100-0000-0111-xxxx-xxxx c enable wdt time-out flag output tone off x100-0000-1000-xxxx-xxxx c turn off tone outputs yes clr timer x100-0000-1101-xxxx-xxxx c clear the contents of the time base generator clr wdt x100-0000-1111-xxxx-xxxx c clear the contents of the wdt stage tone 4k x100-0001-0000-xxxx-xxxx c turn on tone output, tone frequency output: 4khz tone 2k x100-0001-0001-xxxx-xxxx c turn on tone output, tone frequency output: 2khz irq dis x100-0001-0010-xxxx-xxxx c disable irq output yes irq en x100-0001-0011-xxxx-xxxx c enable irq output rc 32k x100-0001-0100-xxxx-xxxx c system clock source, on-chip rc oscillator yes ext (x
tal) x100-0001-0101-xxxx-xxxx c system clock source, external 32khz clock source or crystal oscillator 32.768khz large bias x100-0001-0110-xxxx-xxxx c large bias current option yes middle bias x100-0001-0111-xxxx-xxxx c middle bias current option small bias x100-0001-1000-xxxx-xxxx c small bias current option bias 1/6 x100-0001-1010-xxxx-xxxx c lcd 1/6 bias option yes bias 1/5 x100-0001-1001-xxxx-xxxx c lcd 1/5 bias option frame 170hz x100-0001-1100-xxxx-xxxx c selects 170hz frame frequency frame 89hz x100-0001-1101-xxxx-xxxx c selects 89hz frame frequency frame 64hz x100-0001-1110-xxxx-xxxx c selects 64hz frame frequency yes select 144 16 x100-0001-1111-xxxx-xxxx c this command will change segment from 128 to 144 and common from 32 to 16 f1 x100-1010-0000-xxxx-xxxx c time base clock output: 1hz the wdt time-out flag after: 4s f2 x100-1010-0001-xxxx-xxxx c time base clock output: 2hz the wdt time-out flag after: 2s f4 x100-1010-0010-xxxx-xxxx c time base clock output: 4hz the wdt time-out flag after: 1s ht1670 rev. 1.60 16 november 9, 2010 patented
name command code d/c function def. f8 x100-1010-0011-xxxx-xxxx c time base clock output: 8hz the wdt time-out flag after: 1/2s f16 x100-1010-0100-xxxx-xxxx c time base clock output: 16hz the wdt time-out flag after: 1/4s f32 x100-1010-0101-xxxx-xxxx c time base clock output: 32hz the wdt time-out flag after: 1/8s f64 x100-1010-0110-xxxx-xxxx c time base clock output: 96hz the time-out flag after: 1/16s f128 x100-1010-0111-xxxx-xxxx c time base clock output: 128hz the wdt time-out flag after: 1/32s yes test x100-1111-1111-xxxx-xxxx c test mode, user don
t use. normal x100-1111-1110-xxxx-xxxx c normal mode, 128 32 mode will be set yes note: x stands for don
t care a9~a0: ram address d3~d0: ram data d/c: data/command mode def.: power-on reset default all the bold forms, namely 110, 10 1, and 10 0, are mode commands. of these, 10 0 indicates the command mode id. if successive commands have been issued, the command mode id except for the first command will be omitted. the tone frequency source and the time base/wdt clock frequency source can be derived from an on-chip 32khz rc oscillator, a 32.768khz crystal oscillator, or an external 32khz clock. calculation of the fre - quency is based on the system frequency sources as stated above. it is recommended that the host controller should initialize the ht1670 after power-on reset, otherwise, power on reset may fail, which in turn leads to the malfunctioning of the ht1670. ht1670 rev. 1.60 17 november 9, 2010 patented
package information 208-pin qfp (28mm 28mm) outline dimensions symbol dimensions in inch min. nom. max. a 1.220 1.236 b 1.098 1.106 c 1.220 1.236 d 1.098 1.106 e 0.020 f 0.008 g 0.098 0.122 h 0.134 i 0.004 j 0.014 0.026 k 0.004 0.008 07 ht1670 rev. 1.60 18 november 9, 2010 patented & 7 ) & 7 8 ( $ ; & & $ 7 7 ( 7 % & $ 9 ' * @ # i ?
symbol dimensions in mm min. nom. max. a 31.00 31.40 b 27.90 28.10 c 31.00 31.40 d 27.90 28.10 e 0.50 f 0.20 g 3.10 3.40 h 3.70 i 0.10 j 0.35 0.65 k 0.10 0.20 07 ht1670 rev. 1.60 19 november 9, 2010 patented
ht1670 rev. 1.60 20 november 9, 2010 patented copyright 2010 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek as - sumes no responsibility arising from the use of the specifications described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek
s products are not authorized for use as critical components in life support devices or systems. holtek reserves the right to alter its products without prior notification. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw. holtek semiconductor inc. (headquarters) no.3, creation rd. ii, science park, hsinchu, taiwan tel: 886-3-563-1999 fax: 886-3-563-1189 http://www.holtek.com.tw holtek semiconductor inc. (taipei sales office) 4f-2, no. 3-2, yuanqu st., nankang software park, taipei 115, taiwan tel: 886-2-2655-7070 fax: 886-2-2655-7373 fax: 886-2-2655-7383 (international sales hotline) holtek semiconductor inc. (shenzhen sales office) 5f, unit a, productivity building, no.5 gaoxin m 2nd road, nanshan district, shenzhen, china 518057 tel: 86-755-8616-9908, 86-755-8616-9308 fax: 86-755-8616-9722 holtek semiconductor (usa), inc. (north america sales office) 46729 fremont blvd., fremont, ca 94538, usa tel: 1-510-252-9880 fax: 1-510-252-9885 http://www.holtek.com

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