Texas Instruments BQ2419X I²C Controlled 4.5A Single Cell USB / Adaptor Charger Evaluation Module BQ24195LEVM-193 BQ24195LEVM-193 Datenbogen
Produktcode
BQ24195LEVM-193
1
7
Slave Address
S
1
1
ACK
8
Reg Addr
ACK
1
0
8
Slave Address
1
ACK
8
Data to Addr+1
ACK
1
8
Data to Addr+1
ACK
1
P
1
1
7
Slave Address
S
1
1
ACK
8
Reg Addr
ACK
1
ACK
1
1
P
7
0
1
Data
NCK
8
Slave Address
1
1
1
S
1
7
Slave Address
S
1
1
ACK
8
Reg Addr
ACK
1
Data Addr
ACK
1
1
P
8
0
START
SCL
SDA
S
1-7
8
9
ACK
1-7
8
9
ACK
1-7
8
9
STOP
P
ADDRESS
R/W
DATA
ACK
DATA
SLUSB97 – OCTOBER 2012
Acknowledge (ACK) and Not Acknowledge (NACK)
The acknowledge takes place after every byte. The acknowledge bit allows the receiver to signal the transmitter
that the byte was successfully received and another byte may be sent. All clock pulses, including the
acknowledge 9
that the byte was successfully received and another byte may be sent. All clock pulses, including the
acknowledge 9
th
clock pulse, are generated by the master.
The transmitter releases the SDA line during the acknowledge clock pulse so the receiver can pull the SDA line
LOW and it remains stable LOW during the HIGH period of this clock pulse.
LOW and it remains stable LOW during the HIGH period of this clock pulse.
When SDA remains HIGH during the 9th clock pulse, this is the Not Acknowledge signal. The master can then
generate either a STOP to abort the transfer or a repeated START to start a new transfer.
generate either a STOP to abort the transfer or a repeated START to start a new transfer.
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).
bit (bit R/W). A zero indicates a transmission (WRITE) and a one indicates a request for data (READ).
Figure 26. Complete Data Transfer
Single Read and Write
Figure 27. Single Write
Figure 28. Single Read
If the register address is not defined, the charger IC send back NACK and go back to the idle state.
Multi-Read and Multi-Write
The charger device supports multi-read and multi-write on REG00 through REG08.
Figure 29. Multi-Write
Copyright © 2012, Texas Instruments Incorporated
31
Product Folder Links: