3

FN6731.3

November 24, 2008

Pin Descriptions

PIN

NUMBER

SYMBOL

DESCRIPTION

SOIC

MSOP

1

1

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

2

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

3

4

GND

Ground

-

5

NC

No Connect

46

IRQ2

Interrupt Output 2 is a multi-functional pin that can be used as alarm interrupt or timer interrupt pin. The

function is set via the configuration register.

5

7

SDA

Serial Data (SDA) is a bi-directional 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.

79

output pin. The function is set via the configuration register.

810

Power supply

ISL12082