BQ24735_17 Datasheet, PDF (20/46 Pages) Texas Instruments – 1- to 4-Cell Li+ Battery SMBus Charge Controller for Supporting Turbo Boost Mode With N-Channel Power MOSFET Selector

bq24735
SLUSAK9B – SEPTEMBER 2011 – REVISED APRIL 2015
Programming (continued)
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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
ChargeCurrent() = 0x14H
ChargeVoltage() = 0x15H
InputCurrent() = 0x3FH
ChargeOption() = 0x12H
D7 D0
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
DeviceID() = 0xFFH
Preset to
D7 D0
D15 D8
ManufactureID() = 0xFEH 0b0001001
ChargeCurrent() = 0x14H
ChargeVoltage() = 0x15H
InputCurrent() = 0x3FH
ChargeOption() = 0x12H
LEGEND:
S = START CONDITION OR REPEATED START CONDITION
P = STOP CONDITION
ACK = ACKNOWLEDGE (LOGIC-LOW)
NACK = NOT ACKNOWLEDGE (LOGIC-HIGH)
W = WRITE BIT (LOGIC-LOW)
R = READ BIT (LOGIC-HIGH)
MASTER TO SLAVE
SLAVE TO MASTER
Figure 12. SMBus Write-Word and Read-Word Protocols
A
B
t_LOW t _HIGH
SMBCLK
SMBDATA
Figure 13. SMBus Write Timing
C
D
EF
G
H
I
J
K
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLA VE
D = R/W BIT CLOCKED INTO SLAVE
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E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
Figure 14. SMBus Read Timing
I = ACKNOWLEDGE CLOCK PULSE
J = STOP CONDITION
K = NEW START CONDITION
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