PCF8801

Features:

· Single-chip LCD controller/driver
· Fixed backplane multiplexing at a rate of 1 : 2
· Internal LCD bias generation (0.5VDD)
· 140 segment outputs configured to drive seven 40-segment characters
· On-chip oscillator with one external resistor
· Wide power supply range (2.7 V up to 5.5 V)
· Low power consumption
· Compatible with most microprocessors/microcontrollers
· 1 MHz serial bus interface (280-bit shift register)
· Easily cascaded for large LCD applications (two cascade directions possible)
· Compatible with chip-on-glass technology
· Manufactured by silicon gate CMOS process.


Specifications

SYMBOL	PARAMETER	MIN.	MAX.	UNIT
VDD	supply voltage	-0.5	+6.5	V
VI	input voltage	VSS - 0.5	VDD + 0.5	V
VO	output voltage	VSS - 0.5	VDD + 0.5	V
II	DC input current	-10	+10	mA
IO	DC output current	-10	+10	mA
IDD	VDD current	-50	+50	mA
ISS	VSS current	-50	+50	mA
Ptot	total power dissipation	-	500	mW
P/out	power dissipation per output	-	10	mW
Tamb	ambient temperature	-40	+85
Tstg	storage temperature	-65	+150

Description

The PCF8801 is a peripheral device which interfaces a multiplexed Liquid Crystal Display (LCD) having two backplanes and up to 140 segments. It generates drive signals at a multiplex rate of 1 : 2 allowing seven 40-segment (5 x 8) characters to be driven.

The chip can easily be cascaded for larger LCD applications, and the direction of the information flow in the cascade can be selected. The PCF8801 is compatible with most microprocessors/microcontrollers and communicates via a serial bus interface comprising a 280-bit shift register.

The outputs are multiplexed by a clock signal generated by the internal oscillator which needs only one external resistor. Cascade applications only require the clock signal to be generated by the first device with the internal oscillators in the other devices disabled.
The PCF8801 is designed for chip-on-glass applications. It has a narrow package with raised points (bumps) for easy assembly on to LCD glass.