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AS2591 Datasheet(PDF) 1 Page - ams AG |
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AS2591 Datasheet(HTML) 1 Page - ams AG |
1 / 10 page Preliminary AS2591 Rev. 1.0 Page 1 May 1999 Key Features q q 16-digit LCD driver on a 44 pin CMOS chip q q Operating voltage range: 3.2 to 4.8V q q Low power consumption: max. 150 µA q q Driving 7-segment displays with up to 16 digits and 12 symbols q q Option for 12 digits q q Buffer for 32 digits q q 4 backplanes q q 2-wire interface q q On chip timer for showing elapsed time q q Contrast adjustable q q On chip oscillator using 32.768 kHz crystal q q Compatible with AS2525 Block Diagramme 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. SERIAL I/F 7- SEGMENT DECODER DIGIT MEMORY 32 DIGITS COMMAND DECODER BACKPLANE COUNTER ELAPSE TIME COUNTER TIMER POR OSC CONTRAST VOLTAGE CONTROL 4 16 16 LCD VDD DI SCLK CS VLCD 32.768 kHz AS2591 DATA ADDRESS CONTROL COM1-4 S1_n S2_n Figure 1: Block diagram Austria Mikro Systeme International AG 16-Digit LCD Driver CMOS Integrated Circuit |
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