BQ24747 Datasheet, PDF (23/36 Pages) Texas Instruments – SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator and Charge Enable Pin

bq24747
www.ti.com ............................................................................................................................................................................................. SLUS988 – OCTOBER 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
ChargeCurrent() = 0x14 D7 D0
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
ChargeSpecInfo() = 0x11
ChargerStatus() = 0x13
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 34. SMBus Write-Word and Read-Word Protocols
Figure 35. SMBus Write Timing
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