Texas Instruments BQ28Z610-R2 User Manual

Exp: 8-bit exponent stored with an offset bias of 127. The values 00 and FF have special meaning.
Fract: 23-bit fraction. If the exponent is > 0, then the mantissa is 1.fract. If the exponent is zero, then the
mantissa is 0.fract.
The floating point value depends on the special cases of the exponent:
• If the exponent is FF and the fraction is zero, this represents +/– infinity.
• If the exponent is FF and the fraction is non-zero this represents "not a number" (NaN).
• If the exponent is 00 then the value is a subnormal number represented by (–1)
sign
× 2
–126
× 0.fraction.
• Otherwise, the value is a normalized number represented by (–1)
sign
× 2
(exponent – 127)
× 1.fraction.
13.1.4 Hex
Bit register definitions are stored in unsigned integer format.
13.1.5 String
String values are stored with length byte first, followed by a number of data bytes defined with the length byte.
0 1 . . . N
Length Data0 . . . DataN
13.2 Calibration
13.2.1 Voltage
Class Subclass Name Type Min Max Default Unit Description
Calibration Voltage Cell Gain I2 –32768 32767 12101
(1)
— VC[n]–VC[n–1] gain
Calibration Voltage PACK Gain U2 0 65535 49669
(1)
— PACK–VSS gain
Calibration Voltage VC2 (BAT) Gain U2 0 65535 48936
(1)
— VC2 (BAT)–VSS gain
(1) Setting this value to 0 causes the gauge to use the internal factory calibration default.
13.2.2 Current
Class Subclass Name Type Min Max Default Description
Calibration Current CC Gain F4 1.00E–001 4.00E+000 3.58422 Coulomb Counter Gain
Calibration Current Capacity Gain F4 2.98E+004 1.19E+006 106903.5 Capacity Gain
13.2.3 Current Offset
Class Subclass Name Type Min Max Default Unit Description
Calibration Current Offset CC Offset I2 –32768 32767 0 — Coulomb Counter Offset
Calibration Current Offset
Coulomb Counter
Offset Samples
U2 0 65535 64 —
Coulomb Counter Offset Samples used for
averaging
Calibration Current Offset Board Offset I2 –32768 32767 0 — PCB board offset
Calibration Current Offset CC Auto Config H1 00 07 03 hex
Bit 0: AUTO_CAL_EN: Auto CC Offset calibration
enable
0 = Disabled Auto CC calibration offset
1 = Firmware will perform auto CC calibration on
entry into SLEEP mode. A min auto CC calibration
interval is set to 10 hrs to prevent false wear out.
The result is saved to CC Auto Offset.
Bit 1: AUTO_NESTON: NEST Circuit ON
0 = HW NEST circuit is always on. Individual cell
current measurement may have an error relative
to
Current(), but the Current() accuracy is not
impacted.
1 = When [OFFSET_TAKEN] = 1, FW
automatically controls the HW NEST circuit for best
current and cell current measurements.
Bit 2: OFFSET_TAKEN: CC Auto Offset is taken.
0 = CC Auto Offset has not been measured.
1 = CC Auto Offset has been measured.
Bit 3 to Bit 7: Reserved
Calibration Current Offset CC Auto Offset I2 –10000 10000 0
CC Offset collected via CC Auto Calibration.
Used for cell current measurement and is different
than CC Offset.
Data Flash Values www.ti.com
96 BQ28Z610-R2 SLUUCO0 – APRIL 2022
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Texas Instruments BQ28Z610-R2 Specifications

General

Brand	Texas Instruments
Model	BQ28Z610-R2
Category	Computer Hardware
Language	English