Datasheet

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L SB 0
Preset to0b0001001
ChargeCurrent()= 0x14
D7D0 D15D8
ChargeVoltage()=0x15
InputCurrent() = 0x3F
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 Presetto D7D0 D15D8
ChargerMode()=0x12 0b0001001
ChargeMode()=0x14
ChargeMode()=0x15
ChargeMode()=0x3F
LEGEND:
S=START CONDITIONORREPEATEDSTART CONDITION
ACK= ACKNOWLEDGE(LOGIC-LOW)
W=WRITEBIT (LOGIC-LOW)
MASTER TOSLAV
E
SLAVE TOMASTER
P =STOP CONDITION
NACK=NOT ACKNOWLEDGE(LOGIC-HIGH)
R=READBIT (LOGIC-HIGH)
ChargerMode
()= 0x12
tSU:STA tHD:STA tSU:DAT tHD:DAT tHD:DAT tSU:STOtBUF
bq24765
www.ti.com SLUS999 –NOVEMBER 2009
Figure 28. SMBus Write-Word and Read-Word Protocols
Figure 29. SMBus Write Timing
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