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Step 4: Use BQStudio to generate the ot.fs file, which contains I
the OTP with the values that were just setup in RAM.
Step 5: Use the ot.fs file with the SmartFlash programming tool; the OTP on the BQ27220 device can be
programmed.
8.4 General Setup and Software Installation to Program OTP
1. Equipment needed:
a. Lab power supply configured for 7.4-V output (expect ~5-mA maximum current)
b. Battery or second power supply with ≥ 3.0-V output (expect ~1-mA maximum current)
c. EV2300 (v3.1r or later) or EV2400 USB with I
d. Un-programmed BQ27220 device assembled in the battery pack or on the EVM
e. Example .gg file provided by factory
f.
Battery Management Studio (BQStudio)
g. SmartFlash software executable
2. Install the
BQStudio
3. Connect the EV2300 or EV2400 to the unprogrammed device or EVM.
4. Connect the battery to BAT(+) and V
5. With output disabled, connect the lab power supply to GPOUT and V
Do not apply 7.4 V to the device until prompted by software.
8.5 Launch BQStudio Software
1. Launch BQStudio software.
2. Confirm Gauge Dashboard panel detects the EV2x00 adapter and the BQ27220 device.
3. If the device has been previously SEALED, UNSEAL it by sending the appropriate keys to Control() (0x00
and 0x01). The BQ27220 boots up in UNSEAL mode, but not in FULL ACCESS mode. Enter FULL ACCESS
mode to gain access to the Data Memory. See
4. Click Data Memory to show the OTP factory defaults that are in data memory (RAM).
5. Click Import to load Data Memory contents from provided sample .gg file.
SLUUBD4A – APRIL 2016 – REVISED NOVEMBER 2022
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software installer
software.
(–) pins.
SS
Copyright © 2022 Texas Instruments Incorporated
2
C instructions (with data) on how to program
2
C interface adapter
(–) pins.
SS
Note
Chapter 6
for the procedure to enter FULL ACCESS.
Updating BQ27220 Configuration Parameters
BQ27220
77
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