AATIAN17 Datasheet, PDF (2/6 Pages) SiGe Semiconductor, Inc. – I2C/S2Cwire™ Controller

EV-125
I²C/S²Cwire™ Controller
with AAT1142 Demo Board
Pinouts
Connection
The five-wire ribbon cable connector is a standard 0.1-inch (2.54mm) pitch. One end has a five-header con-
nector and the other end has two connectors (three-header and two-header). The five-header connector
should connect to the controller board. The three-header and two-header are connected to the AAT1142 demo
board in the orientation shown in Figure 1.
Order of Leads
1. GND
2. EN
3. VCC
4. SCL
5. SDA
Ground Pin
It is imperative that the controller board be on a common ground with the slave board. If the ground is not con-
nected, the signaling is entirely unpredictable and communication will likely be corrupted.
VCC Pin
VCC is the power for the master system and the voltage range is from 2.7V to 5.5V. The DC source powers
both the I²C/S²Cwire controller board and AAT1142 demo board.
I²C Pins
SCL (Serial Clock line): the signal used to synchronize communication between the master and the slave.
SDA (Serial Data line): the signal used to transfer data between the transmitter and the receiver.
EN Pin
EN (EN/SET): When using the I²C protocol interface, this EN pin provides logic high to enable the demo board
device. When using the S²Cwire protocol interface, the demo board provides clock edges. (Please refer to the
AAT1142 product datasheet for more information.)
Pull-Up Resistors
There is a 4.7kΩ resistor on each I²C line (SCL, SDA) and S²Cwire enable (EN) pins. These pins are effec-
tively pulled up to the V_CC input rail, resulting in approximately 1mA of pull-up current. The I²C specification
allows for a maximum of 3mA pull-up current on each I²C line.
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EV-125.2006.08.1.1