BQ2060A_15 Datasheet, PDF (53/61 Pages) Texas Instruments – SBS v1.1-Compliant Gas Gauge IC

bq2060A
www.ti.com
SLUS500D – OCTOBER 2001 – REVISED OCTOBER 2011
[(ADC Reading + ADC Offset) x ADC Sense Resistor Gain]
Current =
16384
(31)
The nominal value for ADC Sense Resistor Gain is given by Equation 4.
VFC
To calibrate the coulomb counting measurement for VFC gain errors and sense resistor tolerance, the value of
VFC Sense Resistor Gain EE 0x6a–0x6b may be adjusted from its nominal value.
The nominal value of VFC Sense Resistor Gain is given by Equation 5.
The bq2060A VFC circuit can introduce a signal opposite in sign from that of the inherent device and circuit
offset to cancel this error. The offset calibration routine is initiated with commands to ManufacturerAccess().
The bq2060A calculates the offset with the calibration routine and stores the calibration value using the least 21
bits of VFC Offset in EE 0x5e–0x60.
The least 20 bits store the offset calibration value (OCV). The sign of the offset calibration value is positive if the
21st bit is 0.
0.6 V
OCV =
VFC Offset_19-0
(32)
Temperature
The bq2060A uses Temperature Offset in EE 0x61 to calibrate the Temperature() function for offset. The
required offset adjustment, TOFF ©), sets Temperature Offset according to Equation 33.
Temperature Offset + TOFF 10
(33)
where –12.8 ≤ TOFF ≤ 12.7
CONSTANTS AND STRING DATA
EEPROM Constants
Check/Byte 1 EE 0x00–0x01 and Check Byte 2 EE 0x7e–0x7f must be programmed to 0x3c7f and 0xa55a,
respectively.
Specification Information
Specification Information EE 0x14–0x15 stores the default value for the SpecificationInfo() function. It is stored in
EEPROM in the same format as the data returned by the SpecificationInfo().
Manufacture Date
Manufacture Date EE 0x16–0x17 stores the default value for the ManufactureDate() function. It is stored in
EEPROM in the same format as the data returned by the ManufactureDate().
Serial Number
Serial Number EE 0x18–0x19 stores the default value for the SerialNumber() put Range function. It is stored in
EEPROM in the same format as the data returned by the SerialNumber().
Manufacturer Name Data
Manufacturer Name Length EE 0x20 stores the length of the desired string that is returned by the
ManufacturerName() function. Locations EE 0x21–0x2a store the characters for ManufacturerName() in ASCII
code.
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