BQ24765_15 Datasheet, PDF (19/37 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs

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bq24765
SLUS999 – NOVEMBER 2009
a) Write-Word Format
S
SLAVE
ADDRESS
W
ACK
COMMAND
BYTE
ACK
LOW DATA
BYTE
7 BITS
1b 1b
8 BITS
1b 8 BITS
MSB LSB 0
0
MSB LSB
0 MSB LSB
Preset to 0b0001001
ChargerMode() = 0x12 D7 D0
ChargeCurrent() = 0x14
ChargeVoltage() = 0x15
InputCurrent() = 0x3F
ACK
1b
0
HIGH DATA
BYTE
8 BITS
MSB L SB
D15 D8
ACK P
1b
0
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
ChargerMode() = 0x12
ChargeMode() = 0x14
ChargeMode() = 0x15
ChargeMode() = 0x3F
Preset to
0b0001001
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 28. SMBus Write-Word and Read-Word Protocols
tSU:STA tHD:STA tSU:DAT tHD:DAT tHD:DAT tSU:STO tBUF
Figure 29. SMBus Write Timing
Copyright © 2009, Texas Instruments Incorporated
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