ISL12032 Datasheet, PDF (3/26 Pages) Intersil Corporation – Low Power RTC with Battery Backed SRAM and 50/60 Cycle AC Input and Xtal Back-up

ISL12032
Functional Pin Descriptions
PIN
NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SYMBOL
X1
X2
VBAT
GND
AC
LV
EVIN
EVDET
F_OUT
ACRDY
SDA
SCL
IRQ
V_DD
DESCRIPTION
The input of an inverting amplifier and is intended to be connected to one pin of an external 32.768kHz quartz crystal.
X1 also can be driven directly from a 32.768kHz source with no crystal connected.
The output of an inverting amplifier and is intended to be connected to one pin of an external 32.768kHz quartz crystal.
X2 should be left open when X1 is driven from an external source.
Battery Voltage. This pin provides a backup supply voltage to the device. VBAT supplies power to the device in the
event that the V_DD supply fails. This pin should be tied to ground if not used.
Ground.
AC Input. The AC input pin accepts either 50Hz of 60Hz AC 2.5V_P-P sine wave signal.
Low Voltage detection output/Brownout Alarm. Open drain active low output.
Event Input - The EVIN is a logic input pin that is used to detect an externally monitored event. When a high signal
is present at the EVIN pin, an “event” is detected.
Event Detect Output. Active when EVIN is triggered. Open Drain active low output.
Frequency Output. Register selectable frequency clock output. CMOS output levels.
AC Ready. Open Drain output. When High, AC input signal is qualified for timing use.
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.
Serial Clock. The SCL input is used to clock all serial data into and out of the device.
Interrupt Output. Open Drain active low output. Interrupt output pin to indicate alarm is triggered.
Power supply.
3
FN6618.2
April 16, 2009