ISL12030 Datasheet, PDF (2/17 Pages) Intersil Corporation – Low Power RTC with 50/60 Cycle AC Input, Alarms and Daylight Savings Correction

Block Diagram
SDA
SCL
V_DD
ISL12030
SDA
BUFFER
SCL
BUFFER
INTERNAL
SUPPLY
I²C
INTERFACE
CONTROL
LOGIC
REGISTERS
RTC
DIVIDER
ALARM
AC INPUT
BUFFER
AC
GND
SECONDS
MINUTES
HOURS
DAY OF WEEK
DATE
MONTH
YEAR
CONTROL
REGISTERS
USER
SRAM
IRQ
Functional Pin Descriptions
PIN
NUMBER
2
3
5
6
7
8
1, 4
SYMBOL
GND
AC
SDA
SCL
IRQ
V_DD
NC
DESCRIPTION
Ground.
AC Input. The AC input pin accepts either 50Hz of 60Hz AC 2.5V_P-P sine wave signal.
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.
No Connection. Do not connect to any electrical circuit, power or ground.
2
FN6617.1
January 15, 2008