DA
nerve_radio_pcb
Radio and power supply module
to nerve_pcb.
Table of Contents
1 Overview
| Top | Bottom | v0.1.0-alpha |
|---|---|---|
 |
 |
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2 Board Specifications
2.1 Connectors
Connectors fixed by hardware (PCB traces or the connector itself).
| Connector | Ref | Description |
|---|---|---|
| LMR51430 buck (5 V) regulator | J1 | Pin 1: Ground, Pin 2: VIN supply (> 5 V, <= 36 V) |
| Bottom side 2x10 board-to-board | J2 | See schematic/layout for details |
| 5 V GPIO/PWM breakout | J3 | Pin 1: 5 V, Pin 2-3: GPIO/PWM 1-2 (5 V), Pin 5: Ground |
| SPI breakout | J4 | Pin 1: 3.3 V, Pin 2: MISO, Pin 3: MOSI, Pin 4: CLK, Pin 5: CS, Pin 6: Ground |
2.2 Switching Buck Regulator
The LMR51430 is used for the 5 V (3 A) supply from a 4.5 V to 36 V input.
Also chosen based on previous experience and testing from a previous
project, robotic_hand_pcb.
See documentation
at robotic_hand_pcb/blob/main/README.md#5-switching-buck-regulator.
3 Release Notes
3.1 v0.1.0-alpha
- Pre-release 4-layer board variant.
- Short-term pre-release board bring-up/testing release.
- Order date: 2025/01/13.
3.2 v1.0.0 (WIP)
- Incremented major version since
v0.1.0-alphapre-release due to partial
redesign including full component changes.- Buck converter redesign (TPSM843x20 -> LMR51430), reasoning:
- Potential supply chain risks and cost.
- Improved compatibility in common buck converter IC footprints.
- Reduced restrictions on space allocated for power supply circuits.
- Improved input voltage range (> 5 V, <= 36 V) -> (> 5 V, <= 17 V).
- Easier to test due to exposed switch node.
- Buck converter redesign (TPSM843x20 -> LMR51430), reasoning: