Texas Instruments BMS034E1, Руководство пользователя

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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 Equipment Setup steps have been followed.
2. Remove the shunt on JP17 to disable charge.
3. Launch the TI-CHARGER-GUI software and select the BQ25672, if not already done.
4. Turn on PS1 and Load #1:
• Measure
➡
V
SYS-PGND
(TP28 and TP45) = 8.55 V ±0.2 V
2.4.2 Communication Verification
Use the following steps for communications verification:
1. In the TI Charger GUI, select the device to be evaluated, once directed, the software will be directed to
Home page. The connection status should display as Connected .
Note
If the device is not communicating and does not connect, verify that Section 2.2 and Section
2.4.1 steps have been followed. Verify the voltage across TP41 (PULLUP) and TP49 (AGND) is
approximately 3.3 V.
2. Select Menu in the top left of the screen. Note the names of the pages and the associated icons.
3. Prepare the charge mode charger register settings in the following way if not already set there by default:
• On the Quick Start page below the Quick Start section
– Set Watchdog Timer to "Disabled"
– Set Charge Current to "0.500 A"
– Set Charge Voltage to "8.400 V"
• On the Charger Configuration page below the Charging Configuration section
– Set Precharge current to "0.240 A"
– Set VSYSMIN to "7.000 V"
• On the Charger Configuration page below the Input Configuration section
– Set IINDPM to "3.000 A"
– Set ABS VINDPM to "6.000 V"
• On the Chip Configuration page below the Chip Configuration section
– Check the ShipFET Present? box
2.4.3 Charge Mode Verification
Use the following steps for charge mode verification, including pre-charge, CC and CV phases for boost
operation:
1. PS1 and Load #1 should be on from Initial Settings . In the EVM GUI, it is generally recommended to read
READ ALL REGISTERS one time in order to show all the interrupts (from status changes, automated routine
completion, faults) that occurred since the last read. Reading those registers a second clears the interrupts.
After reading the registers,
•
Verify
➡
the Status and Faults page reports all Normal, meaning no DPM loops active and no WD timer
fault, VAC1 Present, VBUS Present and Power Good
2. Reinstall the shunt on jumper J17 to enable charge
• Verify
➡
STAT LED (D13) is lit
3. Take measurements as follows, noting that you may have to adjust the output of the load to accommodate
for voltage drop across the leads from the load to the EVM:
•
Measure
➡
V
VBUS-PGND
(TP23 and TP44) = 12.0 V ±0.2 V
• Measure
➡
V
BAT-PGND
(TP29 and TP46) = 5.0 V ±0.2 V
• Measure
➡
I
BAT_SENSE
(voltage across 0.01 ohm resistor between TP19 and TP20) = 240 mA ±60 mA
• Click READ ALL REGISTERS and Verify
➡
Charge Status reports Precharge
4. Increase Load #1 regulation voltage to 8.0 V and take measurements as follows, noting that you may have
to adjust the output of the load to accommodate for voltage drop across the leads from the load to the EVM:
www.ti.com Test Setup and Results
SLUUCF3A – DECEMBER 2020 – REVISED OCTOBER 2021
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BQ25672 Evaluation Module 9
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