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ISL12023
2
FN6682.3
December 6, 2011
Block Diagram
Pin Configuration
ISL12023
(14 LD TSSOP)
TOP VIEW
GND
I2C
INTERFACE
CONTROL
LOGIC
ALARM
FREQUENCY
OUT
RTC
DIVIDER
SDA
BUFFER
CRYSTAL
OSCILLATOR
POR
SWITCH
SCL
BUFFER
SDA
SCL
X1
X2
VDD
VBAT
INTERNAL
SUPPLY
VTRIP
SECONDS
MINUTES
HOURS
DAY OF WEEK
DATE
MONTH
YEAR
USER
SRAM
CONTROL
REGISTERS
IRQ
FOUT
BROWNOUT
LVRST
ALARM
TEMPERATURE
SENSOR
FREQUENCY
CONTROL
VDD
IRQ
SCL
SDA
X1
X2
VBAT
2
3
4
5
13
12
11
GND
FOUT
LVRST
NC
1
6
7
8
9
10
14
Pin Descriptions
PIN
NUMBER SYMBOL
DESCRIPTION
1, 7, 8, 14
NC
No connect. Do not connect.
2X1
Crystal Input. 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.
3X2
Crystal Output. 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. X2 should be left open when X1 is
driven from external source.
4VBAT
Backup Supply. 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.
5GND
Ground.
6LVRST
Low Voltage Reset pin for VCC Brownout Mode.
Open drain configuration
9FOUT
Frequency Output. Frequency selectable through
Control Register. Open drain configuration.
10
SDA
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.
11
SCL
Serial Clock. The SCL input is used to clock all
serial data into and out of the device.
12
IRQ
Interrupt Output. Provides active low interrupt
signal. Open drain configuration.
13
VDD
Power Supply.
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