bq20z45
SLUS800–MARCH 2009 .................................................................................................................................................................................................. www.ti.com
COMMUNICATIONS
The bq20z45 uses SMBus v1.1 with Master Mode and package error checking (PEC) options per the SBS
specification.
SMBus On and Off State
The bq20z45 detects an SMBus off state when SMBC and SMBD are logic-low for ≥ 2 seconds. Clearing this
state requires either SMBC or SMBD to transition high. Within 1 ms, the communication bus is available.
SBS Commands
Table 1. SBS COMMANDS
SBS
Cmd
Size in
Bytes
Min
Value
Max
Value
Mode
Name
Default Value
Unit
Format
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0a
0x0b
0x0c
0x0d
0x0e
0x0f
R/W
R/W
R/W
R/W
R/W
R
ManufacturerAccess
RemainingCapacityAlarm
RemainingTimeAlarm
BatteryMode
hex
2
0x0000
0xffff
—
—
unsigned int
unsigned int
hex
2
0
65535
65535
0xe383
32767
65534
65534
65535
65535
65535
32767
32767
100
300
mAh or 10mWh
2
0
10
min
2
0x0000
—
—
AtRate
signed int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
signed int
signed int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
unsigned int
hex
2
–32768
—
mA or 10mW
AtRateTimeToFull
AtRateTimeToEmpty
AtRateOK
2
0
—
min
R
2
0
—
min
R
2
0
—
—
R
Temperature
2
0
—
0.1°K
R
Voltage
2
0
—
mV
R
Current
2
–32768
—
mA
R
AverageCurrent
MaxError
2
–32768
—
mA
R
1
0
—
%
R
RelativeStateOfCharge
AbsoluteStateOfCharge
RemainingCapacity
FullChargeCapacity
RunTimeToEmpty
AverageTimeToEmpty
AverageTimeToFull
ChargingCurrent
ChargingVoltage
BatteryStatus
1
0
100
—
%
R
1
0
100+
65535
65535
65534
65534
65534
65534
65534
0xffff
—
%
R/W
R
2
0
—
mAh or 10mWh
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1a
0x1b
0x1c
0x20
0x21
0x22
0x23
0x2f
2
0
—
mAh or 10mWh
R
2
0
—
min
R
2
0
—
min
R
2
0
—
min
R
2
0
—
mA
R
2
0
—
mV
R
2
0x0000
—
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
CycleCount
2
0
65535
65535
16000
0xffff
—
—
DesignCapacity
DesignVoltage
SpecificationInfo
ManufactureDate
SerialNumber
2
0
4400
14400
0x0031
01-Jan-1980
0x0001
Texas Inst.
bq20z45
LION
—
mAh or 10mWh
2
7000
mV
—
2
0x0000
2
0
65535
0xffff
—
2
0x0000
—
ManufacturerName
DeviceName
String
20+1
20+1
4+1
14+1
20+1
2
—
—
—
—
—
0
—
—
String
—
—
DeviceChemistry
ManufacturerData
Authenticate
String
—
—
String
—
—
R/W
R
String
—
—
—
0x3c
0x3d
0x3e
0x3f
CellVoltage4
unsigned int
unsigned int
unsigned int
unsigned int
65535
65535
65535
65535
—
mV
mV
mV
mV
R
CellVoltage3
2
0
—
R
CellVoltage2
2
0
—
R
CellVoltage1
2
0
—
14
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