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ISL1209 View Datasheet(PDF) - Intersil

Part Name
Description
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ISL1209 Datasheet PDF : 24 Pages
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ISL1209
Block Diagram
SDA
SCL
SDA
BUFFER
SCL
BUFFER
I2C
INTERFACE
CONTROL
LOGIC
X1
X2
VDD
VTRIP
VBAT
CRYSTAL
OSCILLATOR
RTC
DIVIDER
POR
FREQUENCY
OUT
SWITCH
INTERNAL
SUPPLY
ALARM
EVIN
GND
Seconds
Minutes
Hours
Day of Week
Date
Month
Year
CONTROL
REGISTERS
USER
SRAM
IRQ/
FOUT
EVDET
Pin Descriptions
PIN
NUMBER
SYMBOL
DESCRIPTION
1
X1
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
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. X2 should be left open when X1 is driven from external source.
3
VBAT
VBAT. 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
EVIN Event Input (EVIN). The EVIN is an input pin that is used to detect an externally monitored event. When a high signal
is present at the EVIN pin an “event” is detected.
6
EVDET Event Detect Output, active when EVIN is triggered. Open drain output.
7
SDA
Serial Data (SDA). 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.
8
SCL
Serial Clock (SCL). The SCL input is used to clock all serial data into and out of the device.
9
IRQ/FOUT Interrupt Output IRQ, /Frequency Output FOUT. Multi-functional pin that can be used as interrupt or frequency
output pin. The function is set via the configuration register.
10
VDD
VDD. Power supply.
2
FN6109.1
September 27, 2005
 

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