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projects:electronics:nrf52:nrf52840_notes
Table of Contents
nRF52840 Notes
High Voltage Mode
Motivation
- Simplify BoM and layout by using the nrf52840 VDDH → VDD LDO instead of an external 3.3 V LDO
Limitations
- <25 mA output from VDDH to VDD (REG0)
- 2.5 V < VDDH < 5.5 V
Requirements
- VDD must not be connected to VDDH or any power supply at reset
- Adafruit nRF52 Bootloader → board.h →
#define UICR_REGOUT0_VALUE UICR_REGOUT0_VOUT_3V3(Adafruit nRF52 Bootloader GitHub search)- If not defined, default REGOUT0 output = VDD = 1.8 V and GPIO output high = VDD = 1.8 V
Notes
nice_nanoseems like a good bootloader variant to use if you need High Voltage mode
Further Reading
NFC Pins as GPIO
Motivation
- Have more usable GPIO pins
Requirements
- Adafruit nRF52 Bootloader → board.mk →
USE_NFCTmust not be= yes(Adafruit nRF52 Bootloader GitHub search)
Flash Bootloader with ST-Link
openocd -f interface/stlink.cfg -f target/nrf52.cfg -c "program nice_nano_bootloader-0.9.2_s140_6.1.1.hex verify reset exit"
projects/electronics/nrf52/nrf52840_notes.txt · Last modified: by Andrew Yong
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