BQ25601 Datasheet, PDF (31/60 Pages) Texas Instruments – I2C Controlled 3-A, Single-Cell Battery Charger for High Input Voltage and Narrow Voltage DC (NVDC) Power Path Management

bq25601
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SLUSCK5 – MARCH 2017
8.4.11.5 Slave Address and Data Direction Bit
After the START, a slave address is sent. This address is 7 bits long followed by the eighth bit as a data direction
bit (bit R/W). A zero indicates a transmission (WRITE) and a one indicates a request for data (READ).
SDA
SCL
S
START
1-7
ADDRESS
8
9
1-7
8
9
R / W ACK
DATA
ACK
Figure 23. Complete Data Transfer
1-7
8
DATA
9
ACK
P
STOP
8.4.11.6 Single Read and Write
If the register address is not defined, the charger IC send back NACK and go back to the idle state.
1
7
1
1
S Slave Address 0 ACK
8
Reg Addr
1
ACK
8
Data to Addr
1
1
ACK P
Figure 24. Single Write
1
7
1
1
S Slave Address 0 ACK
8
Reg Addr
1
1
ACK S
7
Slave Addr
1
1
1 ACK
Figure 25. Single Read
8
Data
1
1
NCK P
8.4.11.7 Multi-Read and Multi-Write
The charger device supports multi-read and multi-write on REG00 through REG0B.
1
7
1
1
S Slave Address 0 ACK
8
Reg Addr
1
ACK
8
Data to Addr
1
8
1
ACK Data to Addr + N ACK
Figure 26. Multi-Write
8
1
1
Data to Addr + N ACK P
1
7
1
1
S Slave Address 0 ACK
8
Reg Addr
1
1
7
1
1
ACK S Slave Address 1 ACK
8
Data @ Addr
1
8
1
ACK Data @ Addr + 1 ACK
Figure 27. Multi-Read
8
1
1
Data @ Addr + N NCK P
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