2.4 Procedure
2.4.1 Charge Function
Use the following for charge function settings:
1. Make sure the
2. Set the
Tgt Address
to
12(9)
for BQ25720 or
D6(6B)
for BQ25723.
3. Write “020E” to charge option 0 register 0x12H (BQ25720) or 0x00H (BQ25723).
Measure → V(J1(V
IN
)) = 10 V ±0.5 V
Measure → V(TP28(CHRG_OK)) = 3 V to 4.5 V
Measure → V(TP21(REGN)) = 6 V ±1 V
Measure → V(TP22(ILIM_HIZ)) = 2.2 V
4. Write “0800” to charge current 0x14H (BQ25720) or 0x02H (BQ25723).
Turn on load #1.
Measure → V(J6(SYS)) = 8.4 V ±0.5 V
5. Turn on LOAD #2 (VBAT Load).
Measure → V(J5(VBAT)) = 7 V ±0.5 V
Measure → I(J5(VBAT)) = 2 A ±0.5 V
2.4.2 OTG Function
Use the following for OTG function settings:
1. Connect a 7-V power supply to the VBAT load.
Remove the V
IN
power supply from J1. (The connection must be physically removed from the board).
2. Write “20D0” to the
Charge Voltage Register
.
3. Write “09C4” to the OTG voltage register.
4. Write “4000” to the OTG current registers.
5. Remove JP2 to enable the OTG function.
6. Select
EN_OTG
in
Charge Option 3
.
Measure → V(J1(V
IN
)) = 5 V ±1 V
Figure 2-4. EN_OTG
Test Summary
SLUUC74 – MAY 2021
BQ25720, BQ25723 Evaluation Module
9
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