BQ24745_14 Datasheet, PDF (19/39 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery

www.ti.com
bq24745
SLUS761D – DECEMBER 2007 – REVISED OCTOBER 2011
a) Write-Word Format
S
SLAVE
ADDRESS
W
ACK
COMMAND
BYTE
ACK
LOW DATA
BYTE
ACK
HIGH DATA
BYTE
ACK P
7 BITS
1b 1b
8 BITS
1b 8 BITS
1b
8 BITS
1b
MSB LSB 0
0
MSB LSB
0
MSB LSB
0
MSB LSB
0
Preset to 0b0001001
D7 D0
ChargeCurrent() = 0x14
ChargeVoltage() = 0x15
InputCurrent() = 0x3F
D15 D8
b) Read-Word Format
S
SLAVE
ADDRESS
W
ACK
COMMAND
BYTE
ACK S
SLAVE
ADDRESS
R
ACK
LOW DATA
BYTE
ACK
HIGH DATA
BYTE
NACK P
7 BITS 1b 1b
8 BITS
1b
7 BITS
1b 1b
8 BITS
1b
8 BITS
1b
MSB LSB 0 0
MSB LSB
0
MSB LSB 1
0
MSB LSB 0
MSB LSB
1
Preset to 0b0001001
Register
ChargeMode() = 0x14
ChargeMode() = 0x15
ChargeMode() = 0x3F
Preset to
0b0001010
D7 D0
D15 D8
LEGEND:
S = START CONDITION OR REPEATED START CONDITION
ACK = ACKNOWLEDGE (LOGIC-LOW)
W = WRITE BIT (LOGIC-LOW)
P = STOP CONDITION
NACK = NOT ACKNOWLEDGE (LOGIC-HIGH)
R = READ BIT (LOGIC-HIGH)
MASTER TO SLAVE
SLAVE TO MASTER
Figure 33. SMBus Write-Word and Read-Word Protocols
Figure 34. SMBus Write Timing
Copyright © 2007–2011, Texas Instruments Incorporated
Product Folder Link(s) :bq24745
Submit Documentation Feedback
19