3

FN8232.4

October 18, 2006

Pin Descriptions

PIN NUMBER

SYMBOL

BRIEF DESCRIPTION

SOIC

TSSOP

1

3

X1

The X1 pin is the input of an inverting amplifier and is intended to be connected to one pin of an external

32.768kHz quartz crystal. X1 can also be driven directly from a 32.768kHz source.

2

4

X2

The X2 pin is the output of an inverting amplifier and is intended to be connected to one pin of an external

32.768kHz quartz crystal.

3

5

RESET

RESET. This is a reset signal output. This signal notifies a host processor that the “watchdog” time period

output. Recommended value for the pull-up resistor is 5k

Ω, If unused, connect to ground.

4

6

GND

Ground.

5

7

SDA

Serial Data (SDA) is a bidirectional pin used to transfer serial data into and out of the device. It has an

open drain output and may be wire OR’ed with other open drain or open collector outputs.

6

8

SCL

The Serial Clock (SCL) input is used to clock all serial data into and out of the device. The input buffer on

this pin is always active (not gated).

71

82

Power Supply.

ISL12027