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FN6690.1
September 26, 2008
Block Diagram
I2C
INTERFACE
RTC
CONTROL
LOGIC
FREQUENCY
OUT
RTC
DIVIDER
SDA
BUFFER
CRYSTAL
OSCILLATOR
POR
SWITCH
SCL
BUFFER
SDA
SCL
X1
X2
VDD
VBAT
FT/OUT
INTERNAL
SUPPLY
VTRIP
SECONDS
MINUTES
HOURS
DAY OF WEEK
DATE
MONTH
YEAR
CONTROL
REGISTERS
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. X1 can also be driven directly from a 32.768kHz source.
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.
3VBAT
This input provides a backup supply voltage to the device. VBAT supplies power to the device in the event that the VDD supply
fails. This pin should be tied to ground if not used.
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.
7
FT/OUT
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.
8VDD
Power supply
ISL12008
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