isl12008 Intersil Corporation, isl12008 Datasheet - Page 2

• Manufacturer Part Number: isl12008
• Description: I2c Real Time Clock With Battery Backup
• Manufacturer: Intersil Corporation

Pin Descriptions
Block Diagram
NUMBER SYMBOL
PIN
1
2
3
4
5
6
7
8
FT/OUT
V
GND
SDA
V
SCL
V
V
SDA
X1
X2
SCL
BAT
DD
BAT
DD
X1
X2
V
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.
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.
This input provides a backup supply voltage to the device. V
fails. This pin should be tied to ground if not used.
Ground
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.
The Serial Clock (SCL) input is used to clock all serial data into and out of the device.
512Hz Frequency Output or digital output pin. The function is set via the configuration register. This pin is open drain and
requires an external pull-up resistor.
Power supply
TRIP
BUFFER
BUFFER
SDA
SCL
2
OSCILLATOR
CRYSTAL
POR
INTERNAL
SWITCH
SUPPLY
INTERFACE
I
2
C
FREQUENCY
DIVIDER
RTC
OUT
ISL12008
DESCRIPTION
BAT
supplies power to the device in the event that the V
CONTROL
LOGIC
RTC
DAY OF WEEK
REGISTERS
SECONDS
CONTROL
MINUTES
HOURS
MONTH
YEAR
DATE
FT/OUT
September 26, 2008
DD
FN6690.1
supply