BQ20Z655 Datasheet, PDF (17/23 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE AND PROTECTION ENABLED WITH IMPEDANCE TRACK

bq20z655
www.ti.com
SLUSAH8 – APRIL 2011
COMMUNICATIONS
The bq20z655 uses SMBus v1.1 with Master Mode and package error checking (PEC) options per the SBS
specification.
SMBus On and Off State
The bq20z655 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
MODE
R/W
R/W
R/W
NAME
ManufacturerAccess
RemainingCapacityAlarm
RemainingTimeAlarm
0x03 R/W
0x04 R/W
0x05
R
BatteryMode
AtRate
AtRateTimeToFull
0x06
R
AtRateTimeToEmpty
0x07
R
AtRateOK
0x08
R
Temperature
0x09
R
Voltage
0x0a
R
0x0b
R
0x0c
R
Current
AverageCurrent
MaxError
0x0d
R
RelativeStateOfCharge
0x0e
R
AbsoluteStateOfCharge
0x0f R/W
RemainingCapacity
0x10
R
FullChargeCapacity
0x11
R
RunTimeToEmpty
0x12
R
AverageTimeToEmpty
0x13
R
AverageTimeToFull
0x14
R
ChargingCurrent
0x15
R
ChargingVoltage
0x16
R
0x17 R/W
BatteryStatus
CycleCount
0x18 R/W
0x19 R/W
DesignCapacity
DesignVoltage
Copyright © 2011, Texas Instruments Incorporated
Table 2. SBS COMMANDS
FORMAT
Hex
Integer
Unsigned
integer
Hex
Integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Integer
Integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Unsigned
integer
Hex
Unsigned
integer
Integer
Integer
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
MIN
VALUE
0x0000
0
0
0x0000
–32,768
0
0
0
0
0
–32,768
–32,768
0
0
0
0
0
0
0
0
0
0
0x0000
0
0
7000
Product Folder Link(s): bq20z655
MAX
VALUE
0xffff
700 or 1000
30
DEFAULT
VALUE
—
300 or 432
10
UNIT
—
mAh or 10 mWh
min
0xffff
32,767
65,535
—
—
—
mA or 10 mW
—
min
65,535
—
min
65,535
—
—
65,535
—
0.1°K
20,000
—
mV
32767
—
mA
32,767
—
mA
100
—
%
100
—
%
100+
—
%
65,535
—
mAh or 10 mWh
65,535
—
mAh or 10 mWh
65,534
—
min
65,534
—
min
65,534
—
min
65,534
—
mA
65,534
—
mV
0xdbff
—
—
65,535
0
—
32,767
18,000
4400 or 6336 mAh or 10 mWh
14,400
mV
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