Texas Instruments bq35100 - Factory Calibration; Calibration Method and Sequences

10
SLUUBH1C–August 2016–Revised March 2018
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Copyright © 2016–2018, Texas Instruments Incorporated
Factory Calibration
Chapter 3
SLUUBH1C–August 2016–Revised March 2018
Factory Calibration
The bq35100 fuel gauge requires factory calibration. The gauge performs only a limited number of
calibration functions. The rest must be performed by a host system using commands provided by the
gauge for this purpose. The following sections give a detailed description of the various calibration
sequences with the help of flowcharts.
3.1 General I
2
C Command Information
In the following flowcharts, all I
2
C functions take three arguments.
Write command arguments:
• Address
• Data
• Wait time in ms
Read command arguments:
• Address
• Number of bytes read
• Wait time in ms
3.2 Calibration Overview
3.2.1 Method
The calibration method is broken up into the following sections. The first four sequences are subroutines
to be used in the main calibration sequences. Once in CALIBRATION mode, it is important to perform
voltage calibration first.
• Section 3.3, Enter CALIBRATION Mode
• Section 3.4, Voltage Calibration
• Section 3.5, CC Offset
• Section 3.6, Board Offset
• Section 3.7, Obtain Raw Calibration Data
• Section 3.8, Current Calibration
• Section 3.9, Temperature Calibration
• Section 3.10, Floating Point Conversion
• Section 3.11, Exit CALIBRATION Mode
3.2.2 Sequence
Perform the following calibration sequence during battery pack manufacturing process:
1. Perform Voltage Calibration.
2. Perform CC Offset.
3. Perform Board Offset.
4. Perform Current Calibration.
5. Perform Temperature Calibration.