AS2591

Preliminary AS2591 16-Digit LCD Driver CMOS Integrated Circuit Austria Mikro Systeme International AG Key Features q 16-digit LCD driver on a 44 pin CMOS chip q Operating voltage range: 3.2 to 4.8V q Low power consumption: max. 150 µA q Driving 7-segment displays with up to 16 digits and 12 symbols q Option for 12 digits q Buffer for 32 digits q 4 backplanes q 2-wire interface q On chip timer for showing elapsed time q Contrast adjustable q On chip oscillator using 32.768 kHz crystal q Compatible with AS2525 General Description The AS2591 is a CMOS integrated circuit for driving a liquid crystal display intended for use in telephones. The driver can be used with 12- or 16-digit LCDs. The 2-wire serial interface is compatible with the AS2525, single-chip handsfree telephone circuit. The device is designed for LCDs with 4 backplanes and 24 or 31 segments providing 12 or 16 7-segment digits and 12 symbols. The AS2591 also includes a timer for showing elapsed time in minutes and seconds. The contrast can be adjusted through the serial interface. Package Available in 44 pin TQFP. Block Diagramme VDD POR DI SCLK CS DATA BACKPLANE COUNTER 4 COM1-4 SERIAL I/F 7SEGMENT DECODER SEGMENT MULTIPLEXER DIGIT MEMORY 32 DIGITS 16 S1_n LCD COMMAND ADDRESS DECODER CONTROL 16 S2_n 32.768 kHz OSC ELAPSE TIME COUNTER TIMER VLCD CONTRAST VOLTAGE CONTROL AS2591 Figure 1: Block diagram Rev. 1.0 Page 1 May 1999 Preliminary Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 Name ...