nRF52840 + nPM1300 devboard
Making a devboard with the nRF52840 SoC integrating 2.4Ghz technologies such as Bluetooth, Zigbee, Thread and a complimentary nPM1300 PMIC for power management
Jun 21, 2025 | 22:50 - 00:10 | getting started
Found the datasheet for the microcontroller here: https://docs.nordicsemi.com/bundle/psnrf52840/page/keyfeatureshtml5.html
PMIC datasheet: https://docs.nordicsemi.com/bundle/psnpm1300/page/keyfeatureshtml5.html
Time to go shopping on LCSC (and Digikey for some unavailable parts):
- USB C Receptacle: https://lcsc.com/product-detail/image/GT-USB-7010ASV_C2988369.html
- nRF52840 chip: https://www.digikey.ca/en/products/detail/nordic-semiconductor-asa/NRF52840-QFAA-F-R7/15929801
- nPM1300 chip: https://www.digikey.ca/en/products/detail/nordic-semiconductor-asa/NPM1300-QEAA-R/19722479
- 2.2uH inductor: https://lcsc.com/product-detail/image/ZEMS252012T2R2M_C42462928.html
Jun 22, 2025 | 12:32 - 13:32 | making a pseudo BOM, mostly important parts
Basing from this reference schematic from the nPM1300 datasheet:
Their suggested BOM:
Already picked the inductor yesterday, so let's finish picking the resistors and capacitors.
- 10V 1uF X5R ±10% 0402: https://lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMTHRE-CGA0402X5R105K100GTC7503520.html
- 25V 10uF X5R ±10% 0805: https://lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMTSamsung-Electro-Mechanics-CL21A106KAYNNNEC15850.html
- 25V 2.2uF X7R ±10% 0805: https://www.lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMTSamsung-Electro-Mechanics-CL21B225KAFNNNEC19110.html
- 16V 100nF X7R ±10% 0402: https://www.lcsc.com/product-detail/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMTYAGEO-CC0402KRX7R7BB104C60474.html
- 62.5mW Thick Film Resistor 50V ±100ppm/℃ ±1% 10kΩ 0402 for TWI pull ups: https://www.lcsc.com/product-detail/Chip-Resistor-Surface-MountYAGEO-RC0402FR-0710KLC60490.html
- 62.5mW Thick Film Resistor 50V ±100ppm/℃ ±5% 390kΩ 0402 for initial voltage selection: https://lcsc.com/product-detail/Chip-Resistor-Surface-MountFH-Guangdong-Fenghua-Advanced-Tech-RC-02K394JTC453676.html
Let's wire the schematic for the PMIC!
Since there isn't a symbol for the nPM1300, I guess I will create my own.