Preliminary

AS2591

Rev. 1.0

Page 2

May 1999

Pin Description

Pin #

Name

Type

Description

1

2

3

4

5

6

7

8

9

10

11

12

S2_10

S1_10

S2_11

S1_11

S2_12

S1_12

S2_13

S1_13

S2_14

S1_14

S2_15

S1_15

AO

Segment Outputs

Output pins for driving segments of LCD.

13

CS

DI

Chip Select

Chip select signal from CPU (e.g. AS2525).

14

DI

DI

Data Input

Data input pin for serial interface.

15

SCLK

DI

Serial Clock Input

Clock input pin for serial interface.

16

V

DD

Supply

Positive Voltage Supply

This pin is the positive power supply for the device.

17

V

SS

Supply

Negative Voltage Supply

This pin is the negative power supply for the device.

18

19

XTAL1

XTAL2

Oscillator Pins

Oscillator pins for connection of a 32.768 kHz crystal.

20

V

LCD

AI

LCD Reference Voltage

This is the input pin for setting the internal LCD reference voltage (see

also Figure 4: Supply arrangement).

21

22

23

24

COM1

COM2

COM3

COM4

AO

Backplane Outputs

Ouput pins for driving backplanes of LCD.

Continues…