Step 1: Disable the DCDC in settings (Valid for PNEV5190B and OM27642EVK)
- Write 0x21 into EEPROM PWR_CONFIG (address: 0x0000)
- This disables the DCDC.
- & selects that the VUP must be supplied with the same supply voltage like VBAT = VBATPWR.
Do not enable RF afterwards, before the hardware is modified properly!
Enabling the RF without supplying the VUP might kill the PN5190/PN7642!
Step 2: Supply VUP = VBATPWR
- Connect jumper J13 positions: 1-2:
- This supplies the VUP with VBATPWR = 3.3V
Note: OM27642EVK does not require any jumper settings (DC-DC is not used by default), User only must to disable DC-DC in EEPROM (address 0x0000, value 0x21)
Then you can turn-on RF and perform ULPCD
