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Low-Current, SPI-Compatible
Real-Time Clock
Maxim Integrated
5
DS1347
Pin Configuration
VCC
CS
GND
1
2
8
7
X1
X2
DOUT
DIN
SCLK
TDFN
TOP VIEW
3
4
6
5
DS1347
+
EP
Pin Description
PIN
NAME
FUNCTION
1
SCLK
Serial-Clock Input. SCLK is used to synchronize data movement on the serial interface for either 3-wire or
SPI communications.
2
DOUT
Serial-Data Output. When SPI communication is enabled, the DOUT pin is the serial-data output for the SPI
bus.
3
DIN
Serial-Data Input. When SPI communication is enabled, the DIN pin is the serial-data input for the SPI bus.
4
GND
Ground
5
CS
Active-Low Chip Select. The chip-enable signal must be asserted low during a read or a write for SPI
communications.
6
VCC
Power-Supply Input
7
X2
8
X1
Connections for Standard 32.768kHz Quartz Crystal (see the Crystal Characteristics table).
—
EP
Exposed Pad. Connect to GND or leave unconnected.
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