Texas Instruments BQ25883, Руководство пользователя, Страница: 6 / 25

Test Summary
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6 SLUUC10 – February 2019
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BQ25883 QFN boost-mode battery charger evaluation module
Advance Information
2.2.2 Charge Mode I2C Register Setup
2.2.2.1 BQ25883EVM
1. Turn on BS#1 and set for 7.6 V.
2. In the EVM software, specify the “I2C Address” as D6 (6B) .
3. Click the Read button.
4. In the EVM GUI software Field View , ensure that the following I
2
C registers have the following settings:
• Chose “Disabled” in the drop-down box for the Watchdog Timer
• Input Voltage Limit = "4.4V" (default)
• Input Current Limit = "3.3A"
• Charge Voltage Limit = "8.40V" (default)
• Fast Charge Current Limit = "1.00A"
• Pre-charge Current Limit to "0.15A" (default)
• Minimum System Voltage to "7.0V" (default)
• Deselect Enable Charge to disable charge
• Deselect Enable ILIM pin to disable the ILIM pin
• Deselect Enable HiZ , if selected
5. Click Read Register to confirm that register changes were made.
2.2.3 Charge Mode Test Procedure
Use the following steps for charge mode verification and testing:
1. Turn on PS#1 and click the Read Register button twice.
• Observe → everything "Normal" at the Fault box
• Observe → D4 (STAT) is off because charge is disabled.
• Observe → D5 (PG) is on indicating power is good.
• Measure on VM2 → V(TP14 (SYS), TP26 (AGND)) = 6.4 V ±50 mV
2. On BQ25883EVM, use the GUI to select Enable Charge to start charging at 1.0 A. To correct for cable
resistance, adjust PS#1 until VM1 [TP7 (VBUS_S), TP26 (AGND)] measures 5.5 V ±50 mV and adjust
BS#1 until VM3 [TP15 (BAT), TP26 (AGND)] measures 7.6 V ±50 mV.
• Measure on VM6 → V(TP5 (RBAT+), TP6 (RBAT-)) = 10 mV ±0.7 mV which corresponds to ICHG
= 1.0 A ±5% through a 0.010-
Ω
±1% resistor. Voltage of 0.1 mV is added to account for DMM
accuracy.
• Measure on VM4 → V(TP1 (RAC+), TP2 (RAC-)) = 14.8 mV ±0.7 mV which corresponds to IVBUS
= 1.48 A ±5% (accounting for efficiency variation across ICs and inductors) through a 0.010-
Ω
±1%
resistor. Voltage of 0.1 mV is added to account for DMM accuracy.
3. Optionally, in the GUI, select Enable ILIM pin . Adjust the RLIM potentiometer (R5) until:
• Measure on VM4 → V(TP1 (RAC+), TP2 (RAC-)) = 10 mV ±0.7 mV which corresponds to IVBUS =
1.0 A ±5% through a 0.010-
Ω
±1% resistor. Voltage of 0.1 mV is added to account for DMM
accuracy.
• Obverse in bqStudio after Read Register
→
IINDPM Status: In IINDPM
4. Turn off and disconnect PS#1, BS#1, Load#1, and voltmeters.