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• Measure
➡
I
BAT_SENSE
(voltage across 0.01-Ω resistor between TP19 and TP20) = 500 mA ±50 mA
• Measure
➡
I
VAC1_SENSE
(voltage across 0.01-Ω resistor between TP1 and TP2) = 900 mA ±60 mA
• Click READ ALL REGISTERS and Verify
➡
REG1Cb[7:5] reports fast charge
5. Increase Load #1 regulation voltage to 8.4 V and take measurements as follows:
• Measure
➡
V
BAT-PGND
(TP29 and TP46) = 8.4 V ±0.04 V
• Measure
➡
I
BAT_SENSE
(voltage across 0.01-Ω resistor between TP19 and TP20) = 0 mA ±10 mA
• Click READ ALL REGISTERS and Verify
➡
REG1Cb[7:5] reports termination
6. Helpful hints when changing voltages and register settings from those above during charge mode:
• If increasing charge current or adding a load at SYS J3 terminal, you will likely need to disable the
EN_ILIM bit using 8-bit register tab/Charger Single-bit Registers/REG14b[1] and increase the IINDPM
register setting in 16-bit register tab/Charger Multi-bit Registers/REG06b[8:0].
• If increasing the input voltage above 8 V for the charger to enter buck mode, you will need to increase the
VAC_OVP from 7 V default using 8-bit register tab/Charger Multi-bit Registers/REG10b[5:4].
• The battery configuration is set at startup using the PROG pin (Jumpers JP24 to JP31). The battery
configuration can also be changed using 16-bit register tab/Charger Multi-bit Registers/REG0Ab[7:6].
Note that the SYSMIN and charge current charge with cell configuration.
• The status, fault and interrupt bits report are helpful debug tools.
2.4.4 OTG Mode Verification
Use the following steps for OTG mode verification for boost operation:
1. Power up then turn off Load#2 output. Set to CR = 12 V/0.5 A = 24 Ω. Disconnect PS1 from J1 and attach
Load#2 to J1 (VIN1 and GND).
2. Increase Load #1 regulation voltage to 8.0 V and take measurements as follows:
• Measure
➡
V
BAT-PGND
(TP27 and TP46) = 8.0 V ±0.1 V
3. For BQStudio, prepare the OTG mode charger register settings in the following way:
• On the 8-bit Registers tab in the Chip Config Single-bit Registers section:
– Check the EN OTG Mode box
– Check the EN ACDRV1 box
• On the 8-bit Registers tab in the OTG Multi-bit Registers section:
– Set IOTG 1000 mA to change the OTG current limit.
Figure 2-8. Single-Bit Register Section
• On the 16-bit Registers tab in the OTG Multi-bit Registers section:
– Set the OTG mode regulation voltage to 12000 mV
Test Setup and Results www.ti.com
12 BQ25792EVM, BQ25798EVM and BQ25798BKUPEVM (BMS034) Evaluation
Module SLUUCB5E – JUNE 2020 – REVISED JULY 2022
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