BQ20Z45 Datasheet, PDF (14/20 Pages) Texas Instruments – SBS 1.1-Compliant Gas Gauge and Protection Enabled With Impedance Track™

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
SBS
Cmd
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0a
0x0b
0x0c
0x0d
0x0e
0x0f
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1a
0x1b
0x1c
0x20
0x21
0x22
0x23
0x2f
0x3c
0x3d
0x3e
0x3f
Mode
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R
R
R
R
R
R/W
R
R
R
R
R
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
R
R
R
R
Name
ManufacturerAccess
RemainingCapacityAlarm
RemainingTimeAlarm
BatteryMode
AtRate
AtRateTimeToFull
AtRateTimeToEmpty
AtRateOK
Temperature
Voltage
Current
AverageCurrent
MaxError
RelativeStateOfCharge
AbsoluteStateOfCharge
RemainingCapacity
FullChargeCapacity
RunTimeToEmpty
AverageTimeToEmpty
AverageTimeToFull
ChargingCurrent
ChargingVoltage
BatteryStatus
CycleCount
DesignCapacity
DesignVoltage
SpecificationInfo
ManufactureDate
SerialNumber
ManufacturerName
DeviceName
DeviceChemistry
ManufacturerData
Authenticate
CellVoltage4
CellVoltage3
CellVoltage2
CellVoltage1
Table 1. SBS COMMANDS
Format
hex
unsigned int
unsigned int
hex
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
String
String
String
String
String
unsigned int
unsigned int
unsigned int
unsigned int
Size in
Bytes
2
2
2
2
2
2
2
2
2
2
2
2
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
20+1
20+1
4+1
14+1
20+1
2
2
2
2
Min
Value
0x0000
0
0
0x0000
–32768
0
0
0
0
0
–32768
–32768
0
0
0
0
0
0
0
0
0
0
0x0000
0
0
7000
0x0000
0
0x0000
—
—
—
—
—
0
0
0
0
Max
Value
0xffff
65535
65535
0xe383
32767
65534
65534
65535
65535
65535
32767
32767
100
100
100+
65535
65535
65534
65534
65534
65534
65534
0xffff
65535
65535
16000
0xffff
65535
0xffff
—
—
—
—
—
65535
65535
65535
65535
Default Value
—
300
10
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
4400
14400
0x0031
01-Jan-1980
0x0001
Texas Inst.
bq20z45
LION
—
—
—
—
—
—
Unit
—
mAh or 10mWh
min
—
mA or 10mW
min
min
—
0.1°K
mV
mA
mA
%
%
%
mAh or 10mWh
mAh or 10mWh
min
min
min
mA
mV
—
—
mAh or 10mWh
mV
—
—
—
—
—
—
—
—
mV
mV
mV
mV
14
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