NANOPSU
NANOPSU is a USB PPS based small form factor Voltage source for powering electronics projects. It's using an STM32 WB-series controller for BLE connectivity as main UI. Predefined voltages can be set using the onboard toggle switch.
Features
- USB-C PPS
- BLE Connectivity using the STM32WBA55 μC
- Current, Voltage sensing
- Onboard toggle switch for setting predefined voltages
(1.8V, 3.3V, 5V, 9V, 12V, 16V) - Small form factor
- Onboard RGB LED for feedback
- Reverse current protection
- OCP, OVP
- Fully customizable Voltage table and debug via SWD
Hardware
Microcontroller: STM32WBA55KGU6
- 32-bit Arm® Cortex®-M33 core with TrustZone®
- Up to 100 MHz CPU frequency
- 512 kB Flash memory
- 128 kB SRAM
- Integrated Bluetooth® Low Energy 5.3 radio (2 Mbps, LE Audio, long-range, AoX)
- Security: Arm TrustZone®, AES, PKA, RNG, SHA, secure boot
- 12-bit ADC up to 16-channels
- Low-power modes with <1 µA standby
- Rich peripherals: I²C, SPI, USART, LPUART, LPTIM, timers, RTC
- Debug: SWD, SWO, ETM trace
- Package: QFN-32
USB PD Sink Controller: AP33772S
- USB Power Delivery (PD) 3.0 / 3.1 sink controller
- Supports Fixed, PPS (Programmable Power Supply), and AVS (Adjustable Voltage Supply) contracts
- Input voltage range: 3.3V - 24V
- I²C interface for voltage/current request and monitoring
- Integrated protections: OVP, UVP, OCP, OTP
- Drives back-to-back N-channel MOSFETs for VBUS control (reverse current blocking)
- Configurable power levels via NVM registers or I²C commands
- Package: QW-QFN4040-24
DCP3601NMR Buck converter for μC power/logic rail
CLMUD-FKC RGB LED
Schematics
Keybinds
- Select
LMB - Zoom In/Out
Scroll - Pan
RMB Drag - Reset View
R
PCB
Keybinds
- Select
LMB - Zoom In/Out
Scroll - Pan
RMB Drag - Rotate in 3D
LMB Drag - Reset View
R - Switch to 2D
2 - Switch to 3D
3 - Next / Previous Layer
+/- - Fold / Unfold in 3D (rigid-flex)
5 - Flip Board Top / Bottom
F
Quick start
- Plug into a USB-C PPS capable charger
- Set output voltage via BLE app or toggle switch
-
RGB LED indicates active voltage preset
-
RGB LED indicates state/voltage (see table below):
| Voltage | LED color |
|---|---|
| 1.8 V | WHITE |
| 3.3 V | RED |
| 5 V | GREEN |
| 9 V | BLUE |
| 12 V | CYAN |
| 16 V | PINK |
Still waiting for board, stay tuned
Safety
- Max theoretical output current: 5A (Limited by PD spec)
- Device defaults to 1.8V upon loss of power/restart
🔜Code
Still waiting for board, stay tuned