tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt6554 v1.1 - 1 - april, 2004 lcd driver ic pt6554 description pt6554 is a high performance liquid crystal display (lcd) driver ic utilizing cmos technology specially designed with key input function. it can drive up to a maximum of 164 segments and control up to 4 general purpose output ports. it includes a key scan circuit that can support up to 30 key inputs and provides on-chip voltage detection type reset cir cuit which prevents incorrect display. display data can be directly displayed wit hout using any decoder. pt6554 also supports both 1/4 duty-1/2 bias and 1/4 duty-1/3 bias drive techni ques. pin assignments and application circuit are optimized for easy pcb layout and cost saving advantages. features ? cmos technology ? up to 164 segment drivers (4 com x 41 seg) ? up to 4 general purpose output ports ? key input function ? 1/4 duty-1/2 bias and 1/4 duty-1/3 bias drive techniques ? sleep mode & all segment off function ? on-chip voltage detection type reset circuit ? rc oscillation circuit ? available in 64 pins, qfp or lqfp package application ? electronic equipment with lcd display
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt6554 v1.1 - 2 - april, 2004 lcd driver ic pt6554 pin configuration
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt6554 v1.1 - 3 - april, 2004 lcd driver ic pt6554 application circuit 1 notes: 1. a capacitor must be added to the pow er line so that both the power supply voltage (vdd) rise time when power is applied and the power supply voltage (vdd) fall time when power drops are at least 1 ms. 2. do is an open - drain output and requi res a pull-high resistor between 1k to 10k . the pull-up resistor value must be appropriate to the capacitor of t he external wiring so that the signal wave forms are not degraded.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt6554 v1.1 - 4 - april, 2004 lcd driver ic pt6554 application circuit 2 notes: 1. a capacitor must be added to the power line so that both the power supply voltage (vdd) rise time when power is applied and the power supply voltage (vdd) fall time when power drops are at least 1 ms. 2. do is an open - drain output and requi res a pull-high resistor between 1k to 10k . the pull-up resistor value must be appropriate to the capacitor of t he external wiring so that the signal wave forms are not degraded.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt6554 v1.1 - 5 - april, 2004 lcd driver ic pt6554 application circuit 3 notes: 1. a capacitor must be added to the pow er line so that both the power supply voltage (vdd) rise time when power is applied and the power supply voltage (vdd) fall time when power drops are at least 1 ms. 2. do is an open-drain output and require s a pull-high resistor between 1k to 10k . the pull-up resistor value must be appropriate to the capacitor of the external writing so that the signal wave forms are not degraded. 3. r1=r2=r3, the resistance value must be decide by the lcd panel size.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt6554 v1.1 - 6 - april, 2004 lcd driver ic pt6554 order information order part number package type top code pt6554 64 pin qfp package pt6554 pt6554lq 64 pin lqfp package pt6554lq pt6554 (l) 64 pin qfp package pt6554 pt6554lq (l) 64 pin lqfp package pt6554lq notes: 1. (l) = lead free 2. the lead free mark is put in front of the date code.
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