# 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

| Property | Value |
|---|---|
| **Molecule ID** | `teazzers-solenoid-driver-rp2040-v1-1` |
| **Customer** | Teazzers |
| **Board Size** | 102.4 × 70.4 mm |
| **MCU Module** | [RP2040 PICAN Castellated v1](https://wiki-ufypy5dpx93o.adom.cloud/molecules/rp2040-pican-castellated-v1) (U401) — RP2040 + MCP251863 CAN FD |
| **MOSFET Drivers** | 5× PSMN1R2-30YLD (LFPAK56) — low Rds(on) N-channel |
| **Power Input** | 24V DC via screw terminals |
| **Regulator** | LM2596S-5 — 24V to 5V, 3A buck converter |
| **USB** | USB-C 2.0 (UFP, 5.1k pull-down) for programming |
| **Connectors** | Screw terminals (Phoenix/WAGO), JST-XH, Molex, pin headers |
| **KiCad Version** | 7/8 |

## Sub-Modules

This molecule contains the **[RP2040 PICAN Castellated v1](https://wiki-ufypy5dpx93o.adom.cloud/molecules/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](https://wiki-ufypy5dpx93o.adom.cloud/molecules/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)

| RP2040 GPIO | PICAN Pad | Driver Net | Function |
|---|---|---|---|
| GPIO4 | X9 | /FET5_GATE | Solenoid CH5 gate |
| GPIO5 | X10 | /FET4_GATE | Solenoid CH4 gate |
| GPIO6 | X11 | /FET3_GATE | Solenoid CH3 gate |
| GPIO7 | X12 | /FET2_GATE | Solenoid CH2 gate |
| GPIO8 | X13 | /FET1_GATE | Solenoid CH1 gate |

### Pump Control

| RP2040 GPIO | PICAN Pad | Driver Net | Function |
|---|---|---|---|
| GPIO11 | X16 | /PUMP1 | Pump 1 control |
| GPIO12 | X17 | /PUMP2 | Pump 2 control |
| GPIO13 | X18 | /PUMP3 | Pump 3 control |
| GPIO14 | X19 | /PUMP4 | Pump 4 control |
| GPIO15 | X20 | /PUMP5 | Pump 5 control |

### Status LEDs

| RP2040 GPIO | PICAN Pad | Driver Net | Function |
|---|---|---|---|
| GPIO9 | X14 | /LED1 | LED1 indicator |
| GPIO10 | X15 | /LED2 | LED2 indicator |
| GPIO16 | X21 | /LED3 | LED3 indicator |
| GPIO18 | X38 | /LED4 | LED4 indicator |

### Programming & Debug

| Signal | PICAN Pad | Driver Net | Machine Contact |
|---|---|---|---|
| USB D+ | X41 | /USB_D+ | MC402 |
| USB D- | X40 | /USB_D- | MC403 |
| SWD_CLK | X34 | /SWD_CLK | MC411 |
| SWD_IO | X35 | /SWD_IO | MC412 |
| BOOT | X36 | /BOOT | MC413 |
| RST | X57 | /RST | MC414 |

### Unused PICAN GPIOs

22 PICAN pads are not connected on the driver board:

| PICAN Pad | GPIO / Function |
|---|---|
| X5 | GPIO0 / UART0 TX |
| X6 | GPIO1 / UART0 RX |
| X7 | GPIO2 / I2C1 SDA |
| X8 | GPIO3 / I2C1 SCL |
| X22 | GPIO17 / LED data |
| X23 | GPIO19 |
| X24–X27 | GPIO20–23 / SPI (SDI, CS, SCK, SDO) |
| X29 | GPIO25 |
| X30–X33 | A0–A3 (GPIO26–29) / ADC |
| X37 | GPIO24 |
| X42–X43 | nINT1, nINT0/XSTBY (MCP251863) |
| X44, X53 | RXD, TXD (MCP251863) |
| X47 | nINT (MCP251863) |
| X54 | STBY (MCP251863) |
| X55–X56 | CANH, CANL (CAN bus) |

### 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
| Channel | Gate Net | Drain Net | Output Connector | Function |
|---|---|---|---|---|
| 1 | /FET1_GATE | /DRAIN1 | J301 + MC301/MC302 | Solenoid 1 |
| 2 | /FET2_GATE | /DRAIN2 | J502 + MC503/MC504 | Solenoid 2 |
| 3 | /FET3_GATE | /DRAIN3 | J601 + MC601/MC602 | Solenoid 3 |
| 4 | /FET4_GATE | /DRAIN4 | J701 + MC701/MC702 | Solenoid 4 |
| 5 | /FET5_GATE | /DRAIN5 | J801 + MC801/MC802 | Solenoid 5 |

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

| Contact | Net | Function |
|---|---|---|
| MC203 | +5V_OUT | 5V regulated output |
| MC204 | GND | Ground |
| MC405 | PUMP1 | Pump control 1 |
| MC406 | PUMP2 | Pump control 2 |
| MC407 | PUMP3 | Pump control 3 |
| MC408 | PUMP4 | Pump control 4 |
| MC409 | PUMP5 | Pump control 5 |
| MC410 | GND | Ground |
| MC401 | VBUS | USB VBUS |
| MC402 | USB_D+ | USB data + |
| MC403 | USB_D- | USB data - |
| MC404 | GND | Ground |

### Right Edge (X = 97) — Debug & Programming

| Contact | Net | Function |
|---|---|---|
| MC411 | SWD_CLK | SWD debug clock |
| MC412 | SWD_IO | SWD debug data |
| MC413 | BOOT | Bootloader select |
| MC414 | RST | Reset |

### Left Edge — Power Input

| Contact | Net | Function |
|---|---|---|
| MC201 | GND | Ground |
| MC202 | +24V | 24V power input |

### Bottom Edge (Y = -65) — Solenoid Outputs

| Contact | Net | Function |
|---|---|---|
| MC301 | DRAIN1 | Solenoid 1 drain |
| MC302 | +24V | Solenoid 1 supply |
| MC503 | DRAIN2 | Solenoid 2 drain |
| MC504 | +24V | Solenoid 2 supply |
| MC601 | DRAIN3 | Solenoid 3 drain |
| MC602 | +24V | Solenoid 3 supply |
| MC701 | DRAIN4 | Solenoid 4 drain |
| MC702 | +24V | Solenoid 4 supply |
| MC801 | DRAIN5 | Solenoid 5 drain |
| MC802 | +24V | Solenoid 5 supply |

## Connectors

| Ref | Type | Function |
|---|---|---|
| J201 | Screw terminal (Phoenix, 5.00mm) | 24V power input |
| J202 | Screw terminal (Phoenix, 5.00mm) | 5V power output |
| J203 | Screw terminal (WAGO 2601, 3.50mm) | 24V power input (alt) |
| J204 | Screw terminal (WAGO 2601, 3.50mm) | 5V power output (alt) |
| J205 | Pin header 1×03 (2.54mm) | Power source jumper |
| J301 | Pin header 1×02 | Solenoid 1 output |
| J401 | JST-XH 1×06 (2.50mm) | 3.3V logic connector |
| J402 | USB-C receptacle | Programming / power (UFP) |
| J502–J801 | Pin header 1×02 | Solenoid 2–5 outputs |

## Power Architecture

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

## Status LEDs

| LED | Color | Function |
|---|---|---|
| D202 | Yellow | 24V power indicator |
| D203 | Red | Fault indicator |
| D401 | Yellow | 5V power indicator |
| D402 | Green | MCU status |
| D403 | Yellow | CAN activity |
| D404 | Green | USB activity |
| LED301, LED502, LED601, LED701 | Red | Per-channel solenoid activity |

## 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)