ISL12059 Datasheet, PDF (2/11 Pages) Intersil Corporation – Low Cost and Low Power I2C Bus™ Real Time Clock/Calendar

Block Diagram
ISL12059
SDA
SCL
X1
X2
V_DD
SDA
BUFFER
SCL
BUFFER
I²C
INTERFACE
RTC
CONTROL
LOGIC
CRYSTAL
OSCILLATOR
POR
RTC
DIVIDER
FREQUENCY
OUT
INTERNAL
SUPPLY
SECONDS
MINUTES
HOURS
DAY OF WEEK
DATE
MONTH
YEAR
CONTROL
REGISTERS
FT/OUT
Pin Descriptions
PIN
NUMBER
1
2
3
4
5
6
7
8
SYMBOL
X1
X2
NC
GND
SDA
SCL
FT/OUT
V_DD
DESCRIPTION
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 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.
No Connection. Can be connected to GND or left floating.
Ground
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.
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. It has a default output of high impedance at power-up.
Power supply
2
FN6757.0
June 15, 2009