bq24735
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SLUSAK9 –SEPTEMBER 2011
Figure 19. SMBus Write Timing
A
B
C
D
E
F
G
H
I
J
K
tLOW tHIGH
SMBCLK
SMBDATA
A
= START CONDITION
E = SLAVE PULLS SMBDATA LINE LOW
I = ACKNOWLEDGE CLOCK PULSE
J = STOP CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
K = NEW START CONDITION
Figure 20. SMBus Read Timing
Battery-Charger Commands
The bq24735 supports six battery-charger commands that use either Write-Word or Read-Word protocols, as
summarized in Table 2. ManufacturerID() and DeviceID() can be used to identify the bq24735. The
ManufacturerID() command always returns 0x0040H and the DeviceID() command always returns 0x000BH.
Table 2. Battery Charger Command Summary
REGISTER ADDRESS
0x12H
REGISTER NAME
ChargeOption()
ChargeCurrent()
ChargeVoltage()
InputCurrent()
READ/WRITE
Read or Write
Read or Write
Read or Write
Read or Write
Read Only
DESCRIPTION
Charger Options Control
7-Bit Charge Current Setting
11-Bit Charge Voltage Setting
6-Bit Input Current Setting
Manufacturer ID
POR STATE
0xF902H
0x0000H
0x0000H
0x1000H
0x0040H
0x000BH
0x14H
0x15H
0x3FH
0XFEH
ManufacturerID()
DeviceID()
0xFFH
Read Only
Device ID
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