BQ24150A Datasheet, PDF (26/41 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support

bq24150A
bq24151A
SLUS931 – APRIL 2009 ..................................................................................................................................................................................................... www.ti.com
bq24150A/1A I²C Update Sequence
The bq24150A/1A requires a start condition, a valid I²C address, a register address byte, and a data byte for a
single update. After the receipt of each byte, bq24150A/1A device acknowledges by pulling the SDA line low
during the high period of a single clock pulse. A valid I²C address selects the bq24150A/1A. The bq24150A/1A
performs an update on the falling edge of the acknowledge signal that follows the LSB byte.
For the first update, bq24150A/1A requires a start condition, a valid I²C address, a register address byte, a data
byte. For all consecutive updates, bq24150A/1A needs a register address byte, and a data byte. Once a stop
condition is received, the bq24150A/1A releases the I²C bus, and awaits a new start conditions.
S SLAVE ADDRESS
R/W
‘0’ (Write)
A REGISTER ADDRESS A DATA _A/A P
Data Transferred
(n Bytes + Acknowledge)
From master to bq24150
From bq24150/1 to master
A = Acknowledge (SDA LOW)
A = Not acknowledge (SDA
HIGH)
S = START condition
Sr = Repeated START condition
P = STOP condition
(a) F/S-Mode
F/S-Mode
HS-Mode
F/S-Mode
S HS-MASTER CODE
A ^{Sr SLAVE ADDRESS R/W}
‘0’ (write)
A REGISTER ADDRESS A DATA
Data Transferred
(n Bytes + Acknowledge)
A/A ^P
HS-Mode
Continues
(b) HS- Mode
Figure 31. Data Transfer Format in F/S Mode and H/S Mode
Sr Slave A.
Slave Address Byte
MSB
LSB
X
1
1
0
1
0
1
1
The slave address byte is the first byte received following the START condition from the master device. The
address bits are factory preset to ‘1101011’.
Register Address Byte
MSB
LSB
0
0
0
0
0
D2
D1
D0
Following the successful acknowledgment of the slave address, the bus master will send a byte to the
bq24150A/1A, which contains the address of the register to be accessed. The bq24150A/1A contains five 8-bit
registers accessible via a bidirectional I²C-bus interface. Among them, four internal registers have read and write
access; and one has only read access.
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