AAT1142
800mA Voltage-Scaling Step-Down Converter
2.5
2.0
1.8
(default)
1.5
1.0
0.5
0.0
1
3
5
7
9
11 13 15 17 19 21 23 25 27 29 31 32
I2C/S2Cwire Register
Figure 2: AAT1142 Graphical Output Voltage Programming Map.
STOP
START
SDA
SCL
SDA
SCL
Figure 3: I2C Start and Stop Conditions.
START: A High "1" to Low "0" Transition on the SDA Line While SCL is High "1"
STOP: A Low "0" to High "1" Transition on the SDA Line While SCL is High "1"
I2C Address Bit Map
(LSB) location. The R/W bit determines the direction
of the transfer ('1' for read, '0' for write). The
AAT1142 is a write-only device and this bit must be
set low when communicating with the AAT1142. The
Acknowledge bit (ACK) is set to low by the AAT1142
slave to acknowledge receipt of the address.
Figure 4 illustrates the address bit map format. The
7-bit address is sent with the Most Significant Bit
(MSB) first and is valid when SCL is high. This is fol-
lowed by the R/W bit in the Least Significant Bit
1142.2006.07.1.0
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