Use the following steps for OTG mode verification
for boost operation:
- 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).
- Increase Load #1 regulation voltage
to 8.0 V and take measurements as follows:
- Measure ➡
VBAT-PGND (TP27 and TP46) = 8.0 V ±0.1 V
- 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.
- On the 16-bit Registers
tab in the OTG Multi-bit Registers section,
- Set the OTG mode
regulation voltage to 12000 mV.
For GUI composer, go to OTG Configuration Section and change the following
registers:
- OTG Reg Voltage to 12
V
- IOTG Limit to 1 A.
- Next go to the Chip configuration and check the EN OTG Mode box and EN ACDRV1
box.
- Take measurements as follows:
- Measure ➡
VVBUS-PGND (TP21 and TP45) = 12.0 V ±0.2 V
- Measure ➡
VAC1-PGND (TP22 and TP45) = 12.0 V ±0.2 V
- Click READ ALL
REGISTERS
- Verify ➡
REG1Bb[6] reports VINDPM or OTG
- Verify ➡
REG1Cb[4:1] reports VBUS Status as Normal OTG
- Turn on Load#2 output set to CR of
24 Ω.
- Take measurements as follows:
- Measure ➡
VAC1-PGND (TP22 and TP45) = 12.0 V ±0.2 V
- Measure ➡
IAC1-SENSE (TP1 and TP2) = 500 mA ±0.10 A
- Lower the Load#2 CR to 10 Ω.
- Take measurements as follows to
confirm OTG current function:
- Measure ➡
VAC1-PGND (TP22 and TP45) < 12.0 V ±0.2 V
- Measure ➡
IAC1-SENSE (TP1 and TP2) = 1000 mA ±0.10 A
- Click READ ALL REGISTERS
and Verify ➡ REG1Bb[7] reports IINDPM
- Tips for further OTG testing:
- Enabling OTG mode is a
two-step process: first enable OTG and then turn on the appropriate AC
drive FETs.