Teazzers Solenoid Driver RP2040 v1.1

Solenoid driver molecule for the Teazzers beverage dispensing workcell — 102.4×70.4 mm, 5-channel MOSFET driver with RP2040 PICAN castellated module (CAN FD + USB-C), 24V-to-5V buck regulator, and 29 machine contacts. Controls up to 5 solenoid valves and 1 pressure pump via individual high-side MOSFET switches.

Overview

Sub-Modules

This molecule contains the RP2040 PICAN Castellated v1 as a soldered castellated sub-module (U401). For firmware development, programming, SWD debugging, USB bootloader usage, CAN bus configuration, and the full GPIO/SPI/I2C pinout of the MCU, refer to the PICAN module's wiki page. The PICAN provides the RP2040 MCU, MCP251863 CAN FD controller/transceiver, 16 MB QSPI flash, and USB-C connectivity.

Functional Blocks

5V Buck Regulator

• U201: LM2596S-5 — 24V input, 5V/3A output
• L201: SRR1260-470M (47 µH inductor)
• C202, C203: 220 µF electrolytic caps (input/output)
• D201: SS34 Schottky flyback diode
• Jumper JP201 selects power source: VBUS (USB), +5V_OUT (regulator), or +5V input

MCU — RP2040 PICAN Castellated Module

• U401: RP2040 PICAN Castellated v1 — soldered as a castellated sub-module
• Dual-core Arm Cortex-M0+ with integrated MCP251863 CAN FD controller/transceiver
• 16 MB QSPI flash, 12 MHz crystal
• USB-C routed through to J402 on the carrier board
• SWD debug pads (MC411/MC412) and BOOT/RST pads (MC413/MC414) on right edge

PICAN GPIO → Driver Function Mapping

MOSFET Gate Drives (solenoid switching)

Pump Control

Status LEDs

Programming & Debug

Unused PICAN GPIOs

22 PICAN pads are not connected on the driver board:

5-Channel MOSFET Driver

Each channel (Q301, Q503, Q601, Q701, Q801) is identical:

• PSMN1R2-30YLD N-channel MOSFET (30V, 1.2 mΩ Rds(on), LFPAK56)
• 24k gate pull-down resistor
• 10 Ω gate series resistor (current limiting)
• 10k pull-up for status feedback
• SS34 Schottky flyback diode per channel
• Red LED per channel for activity indication

Solenoid/Pump Outputs

Each output pair has one drain contact and one +24V contact for the solenoid return path.

Machine Contact Pin Mapping

29 machine contacts across 3 edges.

Top Edge (Y = -1) — Signal & Control

Right Edge (X = 97) — Debug & Programming

Left Edge — Power Input

Bottom Edge (Y = -65) — Solenoid Outputs

Connectors

Power Architecture

+24V input ──→ LM2596S-5 ──→ +5V (3A)
                                  │
                        JP201 selects: VBUS / +5V_OUT / +5V
                                  │
                                  ▼
                        RP2040 PICAN module (internal 3.3V LDO)

Status LEDs

Fabrication

• BOM: jlcpcb/production_files/BOM-Taprite-MOSFET-board-as-molecule_rework_PICAN_v1.csv
• CPL: jlcpcb/production_files/CPL-Taprite-MOSFET-board-as-molecule_rework_PICAN_v1.csv
• Gerbers: jlcpcb/production_files/GERBER-Taprite-MOSFET-board-as-molecule_rework_PICAN_v1.zip

3D Models

• Teazzers_Solenoid_Driver_RP2040_v1.1.glb — assembled board with PICAN module (5.1 MB)
• Taprite-MOSFET-board-as-molecule_rework_v1-1.glb — board-only variant (6.0 MB)