PRODUCT DATASHEET
AAT1272
TM
SwitchReg
1.5A Step-Up Current Regulator for Flash LEDs
ack from slave
ack from slave
ack from slave
MSB
Device Address
LSB
w
ack
MSB
Register Address
LSB
ack
MSB
DATA
LSB
ack
stop
start
SCL
SDA
start
Data = 06h
AAT1272 Device Address = 37h
w
ack
Register Address = 00h
ack
ack
stop
Figure 2: I2C Interface Diagram.
STOP
START
SDA
SCL
SDA
SCL
Figure 3: I2C STOP and START 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”
4
3
8
SCL
SDA
1
2
5
6
7
9
MSB
A6
LSB
R/W
A5
A4
A3
A2
A1
A0
ACK
Device Address
Figure 4: I2C Address Bit Map;
7-bit Slave Address (A6-A0), 1-bit Read/Write (R/W), 1-bit Acknowledge (ACK).
4
3
8
SCL
SDA
1
2
5
6
7
9
MSB
D7
LSB
D0
D6
D5
D4
D3
D2
D1
ACK
Register Address /
Data
Figure 5: I2C Register Address and Data Bit Map;
8-bit Data (D7-D0), 1-bit Acknowledge (ACK).
w w w . a n a l o g i c t e c h . c o m
1272.2009.04.1.2
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