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2.4 Test Procedure
2.4.1 Initial Settings
Use the following steps to enable the EVM test setup.
1. Make sure
Section 2.2 steps have been followed.
2. Remove the shunt on JP17 to disable charge.
3. Make sure the PROG pin jumpers, JP22-JP29, are set to the desired frequency and cell count.
4. Make sure the TS Jumpers are installed to the correct posistions if a thermistor is being simulated.
5. If using BQStudio, launch the BQSTUDIO software and select Charger then BQ25792EVM, if not already
done.
6. If using TI Charger GUI, go to the TI Charger GUI website and select the charger from the list.
7. Turn on PS1 and Load #1:
• Measure
➡
V
SYS-PGND
(TP26 and TP48) = 8.55 V ±0.2 V
8. Verify PG LED (D13) is on.
Note
If the PG LED is not lit, confirm a valid PS1 is connected and the correct shunt configuration was
placed.
Note
If the device is not communicating and does not ACK, verify that Section 2.2 and the steps in
this section have been followed. Verify the voltage across TP42 (PULLUP) and TP49 (AGND) is
approximately 3.3 V.
2.4.2 Communication Verification
If using Battery Management Studio, use the following steps for communications verification:
1. In Battery Management Studio, select "READ REGISTER" at the top of the page. "Device ACK OK" should
appear at the top of the page.
2. Select Field View in the top right of the screen. Note there are two tabs, one for 8-bit registers and one
for 16-bit registers. In the 8-bit tab, there are sections for chip, charger and OTG single-bit and multi-bit
registers. In the 16-bit tab are the charger and OTG multi-bit registers for setting voltages and currents. In
addition, the ADC registers are on the 16-bit tab.
3. Prepare the charge mode charger register settings in the following way if not already set there by default:
• On the 8-bit Registers tab in the Chip Config Single-bit Registers section
– Change Watchdog Timer to disabled
– Check the "ShipFET Present?" check box
Figure 2-2. Single-Bit Registers Section
• On the 8-bit Registers tab in the Charger Multi-bit Registers section
– Set the Precharge current to 240 mA
– Set ABS VINDPM to 4000 mV
– Set VSYSMIN to 7000 mV
www.ti.com Test Setup and Results
SLUUCB5E – JUNE 2020 – REVISED JULY 2022
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BQ25792EVM, BQ25798EVM and BQ25798BKUPEVM (BMS034) Evaluation
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