ISL12057

FN6755 Rev 2.00

Page 3 of 18

Sep 25, 2015

Pin Descriptions

PIN

NUMBER

SYMBOL

DESCRIPTION

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. The required crystal load capacitance is 6pF. This pin can also be driven by an external 32.768kHz oscillator

with X2 pin floating.

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. The required crystal load capacitance is 6pF.

3IRQ2

Interrupt Output 2 is a multi-functional pin that can be used as an alarm interrupt. This pin is open drain and requires

an external pull-up resistor. This pin is at high impedance at power-up.

4

GND

Ground

5

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

SCL

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

pin. The function is set via the configuration register. This pin is open drain and requires an external pull-up resistor. It

has a default output of 32.768kHz at power-up.

Power supply