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May 12, 2010
 
IDT Confidential
Pin Assignment
Pin Description
Pin Functional Descriptions
Serial Clock (SCL)
This input signal is used to strobe all data in and out of the device. In applications where this signal is used by slave devices to synchronize the bus
to a slower clock, the bus master must have an open drain output, and a pull-up resistor can be connected from Serial Clock (SCL) to V
DDSPD
. (refer
to the Maximum R
L
 Value vs. Bus Capacitance figure on how the value of the pull-up resistor can be calculated). In most applications, though, this
method of synchronization is not employed, and so the pull-up resistor is not necessary, provided that the bus master has a push-pull (rather than
open drain) output.
Serial Data (SDA)
This bi-directional signal is used to transfer data in or out of the device. It is an open drain output that may be wire-ORed with other open drain or
open collector signals on the bus. A pull up resistor must be connected from Serial Data (SDA) to the most positive V
DDSPD
 in the I
2
C chain. (refer to
the Maximum R
L
 Value vs. Bus Capacitance figure on how the value of the pull-up resistor can be calculated).
Pin #
Pin Name
Definition
1
SA0
Select Address 0
2
SA1
Select Address 1
3
SA2
Select Address 2
4
V
SSSPD
Ground
5
SDA
Serial Data In
6
SCL
Serial Clock In
7
EVENT
Temperature Event Out
8
V
DDSPD
Supply Voltage
STBY
6
5
EVENT
V
SSSPD
8
7
3
4
1
2
SA0
SA2
SDA
SA1
V
DDSPD
SCL
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