GA1621 lcd GA1621general description the GA1621 is a 128 dots (32x4), memory mapping, and multi-function lcd driver. the s/w con-figuration feature of the GA1621 makes it suitable for multiple lcd applications including lcd modules and display subsystems. only three or four lines are required fo r the interface between the host c ontroller and the GA1621. the GA1621 contains a power down command to reduce power consumption. GA1621features z operating voltage: 2.4v~5.2v z software configuration feature z built-in 256khz rc oscillator z data mode and command mode instructions z 8 kinds of time base/wdt clock sources z r/w address auto increment z 32x4 lcd driver z three data accessing modes z 3-wire serial interface z power down command reduces power consumption z internal lcd driving frequency source GA1621pad assignment ic size:2.20mm x 2.15mm the ic cubstrate should be connecte to vdd in pcb layout artwork ????? tel: 0755-88291843 88304213 e-mail: jja@sc-tech.cn add: ?? 16 http:// www.sc-tech.cn free datasheet http:///
GA1621 lcd GA1621 pad coordinates GA1621 pad descriptions pad no. pad name i/o description chip selection input with pull-high resistor. when the cs - is logic high, the data and command read from or written to the GA1621 are disabled. the serial interface ci rcuit is also reset. but if cs - is at logic low level and is input to the cs - pad, the data and command transmission between the host controller and the GA1621 are all enabled. 1 cs- i read clock input with pull-high resistor. data in the ram of the GA1621 are clocked out on the falling edge of the rd - signal. the clocked out data will appear on the data line. the host controller can use the next rising edge to latch the clocked out data. 2 rd- i write clock input with pull-high resistor. da ta on the data line are latched into the GA1621 on the rising edge of the wr-signal. 3 wr- i 4 data i/o serial data input/output with pull-high resistor 5 gnd -- negative power supply, ground ????? tel: 0755-88291843 88304213 e-mail: jja@sc-tech.cn add: ?? 16 http:// www.sc-tech.cn 6 osco 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 and on-chip rc oscillator is selected instead, the osci and osco pads can be left open. 7 osci i 8 vlcd i vlcd i lcd power input 9 vdd -- positive power supply 10 irq o time base or wdt overflow flag, nmos open drain output 11,12 bz,bz- o 2khz or 4khz tone frequency output pair 13~116 com0~com3 o lcd common outputs 48~17 seg0 ~ 31 o lcd segment outputs GA1621 absolute maximum ratings storage temperature ------------------ -50 ~ 125 supply voltage ---------------------- -0.3v ~ 5.5v operating temperature ---------------- -25 ~ 75 input voltage -------- vss - 0.3v ~ vdd + 0.3v free datasheet http:///
GA1621 lcd ????? tel: 0755-88291843 88304213 e-mail: jja@sc-tech.cn add: ?? 16 http:// www.sc-tech.cn GA1621 d.c. characteristics test conditions parameter sym min typ max units v dd conditions operating voltage v dd 3.0 -- 5.0 v -- -- 0.1 5.0 3v stand by current i dd -- 0.3 10.0 ua 5v no load power down mode -- 150 300 3v operating current i op -- 300 600 ma 5v no load/lcd on on-chip rc oscillator -- 60 120 3v operating current i op -- 120 240 ma 5v no load/lcd on crystal oscillator -- 100 200 3v operating current i op -- 200 400 ma 5v no load/lcd on external clock source 0 -- 0.6 3v input low voltage v il 0 -- 1.0 v 5v data, wr-, cs-, rd- 2.4 -- 3.0 3v input high voltage v ih 4.0 -- 5.0 v 5v data, wr-, cs-, rd- 0.5 1.2 -- 3v v ol =0.3v data, bz, bz-, irq- i ol1 1.3 2.6 -- ma 5v v ol =0.5v -0.4 -0.8 -- 3v v oh =2.7v data, bz, bz- i oh1 -0.9 -1.8 -- ma 5v v oh =4.5 v 80 150 -- 3v v ol =0.3v lcd common sink current i ol2 150 250 -- ua 5v v ol =0.5v -80 -120 -- 3v v oh =2.7v lcd common source current i oh2 -120 -200 -- ua 5v v oh =4.5 v 60 120 -- 3v v ol =0.3v lcd segment sink current i ol3 120 200 -- ua 5v v ol =0.5v -40 -70 -- 3v v oh =2.7v lcd segment source current i oh3 -70 -100 -- ua 5v v oh =4.5 v 40 80 150 3v pull high resistor r ph 30 60 100 k 5v data, wr - , cs - free datasheet http:///
GA1621 lcd ????? tel: 0755-88291843 88304213 e-mail: jja@sc-tech.cn add: ?? 16 http:// www.sc-tech.cn GA1621 a.c. characteristics test conditions parameter sym min typ max units v dd conditions -- 256 -- 3v system clock f sys1 -- 256 -- khz 5v on chip rc oscillator 32.768 3v system clock f sys2 32.768 khz 5v crystal oscillator 256 3v system clock f sys3 256 khz 5v external clock source -- f sys1 /1024 -- on-chip rc oscillator -- f sys2 /128 -- crystal oscillator lcd clock f lcd -- f sys3 /1024 -- hz -- external clock source lcd common period t com -- n/f lcd -- s n: number of com -- -- 150 3v serial date clock (wr- pin) f clk1 -- -- 300 khz 5v duty cycle 50% -- -- 75 3v serial date clock (rd- pin) f clk2 -- -- 150 khz 5v duty cycle 50% tone frequency f tone -- 2.0 or 4.0 -- khz -- on-chip rc oscillator 3v serial interface reset pulse width (figure 3) t cs -- 250 -- ns 5v cs- 3.34 -- -- 3v write mode 6.67 -- -- 5v read mode 1.67 -- -- 3v write mode wr-, rd- input pulse width (figure 1) t clk 3.34 -- -- us 5v read mode 3v rise/full time serial data clock width (figure 1) t r, t f -- 120 -- ns 5v 3v setup time for data to wr-, rd- clock width (figure 1) t su -- 120 -- ns 5v 3v hold time for data to wr-, rd- clock width (figure 1) t h -- 120 -- ns 5v 3v setup time for data to cs- clock width (figure 1) t su1 -- 100 -- ns 5v 3v hold time for data to cs- clock width (figure 1) t h1 -- 100 -- ns 5v free datasheet http:///
GA1621 lcd GA1621 commanded formant the GA1621 can be configured by the s/w setting. there are two mode commands to configure the GA1621 resources and to transfer the lcd display data. the configuration mode of the GA1621 is called command mode, and its command mode id is 1 0 0 . the command mode consists of a system configuration command, a system frequency selection command, a lcd configuration command, a tone frequency selection command, a timer/wdt setting command, and an operating command. the data mode, on the other hand, includes read, write, and read-modify-write operations. the following are the data mode ids and the comm and mode id: operation mode id data read 110 data write 101 data read-modify-write 101 command command 100 the mode command should be issued before the data or command is transferred. if successive commands have been issued, the command mode id, namely 1 0 0 , 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 be reset also. once the cs- pin returns to ?0? a new operation mode id should be issued first. ????? tel: 0755-88291843 88304213 e-mail: jja@sc-tech.cn add: ?? 16 http:// www.sc-tech.cn free datasheet http:///
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