component
Control Panel: Workcell
Public Unreviewedby Caleb
Control Panel: Workcell — Raspberry Pi CM5 carrier and smart power-distribution hub for Adom workcells. Four metered supply inputs (4× INA228, 20-bit) feed a switched, isolation-capable rail set delivered to the docked Control Panel: Scaffold over a Samtec ET60 blade dock with SWD/UART debug and RP2350 boot/reset control. On board: gigabit Ethernet, M.2 Wi-Fi + Bluetooth, USB-C/USB-A 3.0 with eFuse-protected VBUS, CAN FD, an 18-LED camera-feedback ring, and nested molecule slots for a PiProbe v1
CM5 Pinout Tree Map — Control-Panel Workcell V2.0.1
Compute Module 5 on two Hirose 100-pin board-to-board connectors: J4 = CM5A (pins 1–100, low-speed/GPIO side), J7 = CM5B (pins 101–200, high-speed side). Net names are the board schematic nets; generated from the routed PCB netlist (DRC-clean).
Tree map by subsystem
CM5 (J4 + J7, 200 pins)
├── Power (13 pins)
│ ├── Unused
│ │ ├── 76 VBAT -> (n.c.)
│ │ └── 99 PMIC_ENABLE -> (n.c.)
│ ├── 5 V input
│ │ ├── 77 +5v_(Input) -> +PS4_SENS
│ │ ├── 79 +5v_(Input) -> +PS4_SENS
│ │ ├── 81 +5v_(Input) -> +PS4_SENS
│ │ ├── 83 +5v_(Input) -> +PS4_SENS
│ │ ├── 85 +5v_(Input) -> +PS4_SENS
│ │ └── 87 +5v_(Input) -> +PS4_SENS
│ ├── GPIO_VREF
│ │ └── 78 GPIO_VREF(1.8v/3.3v_Input) -> GPIO_VREF
│ ├── 3.3 V output
│ │ ├── 84 +3.3v_(Output) -> +3v3_CM5
│ │ └── 86 +3.3v_(Output) -> +3v3_CM5
│ └── 1.8 V output
│ ├── 88 +1.8v_(Output) -> (n.c.)
│ └── 90 +1.8v_(Output) -> (n.c.)
├── Ground — 51 pins
│ └── pins 1-2, 7-8, 13-14, 22-23, 32-33, 42-43, 52-53, 59-60, 65-66, 71, 74, 98, 107-108, 113-114, 119-120, 125-126, 131-132, 137-138, 144, 150, 155-156, 161-162, 167-168, 173-174, 179-180, 185-186, 191-192, 197-198
├── Ethernet (GigE) (12 pins)
│ ├── Pair 3
│ │ ├── 3 Ethernet_Pair3_P -> ETH.TRD3_P
│ │ └── 5 Ethernet_Pair3_N -> ETH.TRD3_N
│ ├── Pair 1
│ │ ├── 4 Ethernet_Pair1_P -> ETH.TRD1_P
│ │ └── 6 Ethernet_Pair1_N -> ETH.TRD1_N
│ ├── Pair 2
│ │ ├── 9 Ethernet_Pair2_N -> ETH.TRD2_P
│ │ └── 11 Ethernet_Pair2_P -> ETH.TRD2_N
│ ├── Pair 0
│ │ ├── 10 Ethernet_Pair0_N -> ETH.TRD0_N
│ │ └── 12 Ethernet_Pair0_P -> ETH.TRD0_P
│ ├── LEDs
│ │ ├── 15 Ethernet_nLED3(3.3v) -> ETH_LEDG
│ │ ├── 17 Ethernet_nLED2(3.3v) -> ETH_LEDY
│ │ └── 21 LED_nACT -> LED_nACT
│ └── Unused
│ └── 18 Ethernet_SYNC_OUT(3.3v) -> (n.c.)
├── microSD (CM5 Lite) (12 pins)
│ ├── SDIO 4-bit
│ │ ├── 57 SD_CLK -> SD_CLK
│ │ ├── 61 SD_DAT3 -> SD_DAT3
│ │ ├── 62 SD_CMD -> SD_CMD
│ │ ├── 63 SD_DAT0 -> SD_DAT0
│ │ ├── 67 SD_DAT1 -> SD_DAT1
│ │ └── 69 SD_DAT2 -> SD_DAT2
│ ├── Unused
│ │ ├── 64 SD_DAT5 -> (n.c.)
│ │ ├── 68 SD_DAT4 -> (n.c.)
│ │ ├── 70 SD_DAT7 -> (n.c.)
│ │ ├── 72 SD_DAT6 -> (n.c.)
│ │ └── 73 SD_VDD_Override -> (n.c.)
│ └── Power
│ └── 75 SD_PWR_ON -> SD_PWR_ON
├── I2C buses (7 pins)
│ ├── SENSOR_I2C-2 (GPIO13/12)
│ │ ├── 28 GPIO13 -> SENSOR_I2C-2.SCL
│ │ └── 31 GPIO12 -> SENSOR_I2C-2.SDA
│ ├── SENSOR_I2C-2 INT (GPIO16)
│ │ └── 29 GPIO16 -> SENSOR_I2C-2.INT
│ ├── PWR_I2C-1 (GPIO2/3)
│ │ ├── 56 GPIO3 -> PWR_I2C-1.SCL
│ │ └── 58 GPIO2 -> PWR_I2C-1.SDA
│ └── LED_I2C-0 (SCL0/SDA0)
│ ├── 80 SCL0 -> LED_I2C-0.SCL
│ └── 82 SDA0 -> LED_I2C-0.SDA
├── CAN FD (SPI4) (7 pins)
│ ├── Interrupts
│ │ ├── 30 GPIO6 -> CAN_SPI-4.nINT0
│ │ ├── 34 GPIO5 -> CAN_SPI-4.nINT
│ │ └── 37 GPIO7 -> CAN_SPI-4.nINT1
│ └── SPI
│ ├── 38 GPIO11 -> CAN_SPI-4.SCK
│ ├── 39 GPIO8 -> CAN_SPI-4.nCS
│ ├── 40 GPIO9 -> CAN_SPI-4.SDO
│ └── 44 GPIO10 -> CAN_SPI-4.SDI
├── I2S microphone (3 pins)
│ └── MIC_I2S-0 (GPIO19/20/18)
│ ├── 26 GPIO19 -> MIC_I2S-0.WS
│ ├── 27 GPIO20 -> MIC_I2S-0.SD
│ └── 49 GPIO18 -> MIC_I2S-0.SCK
├── USB 2.0 OTG (3 pins)
│ ├── USB_OTG ID
│ │ └── 101 USB_OTG_ID -> USB_OTG
│ └── USB2 D±
│ ├── 103 USB2_N -> DEBUG_USB2_N
│ └── 105 USB2_P -> DEBUG_USB2_P
├── USB3-0 (USB-C J10) (6 pins)
│ └── SuperSpeed + D±
│ ├── 128 USB3-0-RX_N -> USER_USB3-0.RX_N
│ ├── 130 USB3-0-RX_P -> USER_USB3-0.RX_P
│ ├── 134 USB3-0-D_P -> USER_USB3-0.D_P
│ ├── 136 USB3-0-D_N -> USER_USB3-0.D_N
│ ├── 140 USB3-0-TX_N -> USER_USB3-0.TX_N
│ └── 142 USB3-0-TX_P -> USER_USB3-0.TX_P
├── USB3-1 (USB-A J9) (6 pins)
│ └── SuperSpeed + D±
│ ├── 157 USB3-1-RX_N -> USER_USB3-1.RX_N
│ ├── 159 USB3-1-RX_P -> USER_USB3-1.RX_P
│ ├── 163 USB3-1-D_P -> MUX_USB3-1.D_P
│ ├── 165 USB3-1-D_N -> MUX_USB3-1.D_N
│ ├── 169 USB3-1-TX_N -> USER_USB3-1.TX_N
│ └── 171 USB3-1-TX_P -> USER_USB3-1.TX_P
├── USB3-1 mux control (2 pins)
│ ├── MUX_USB3-1_SEL (GPIO27)
│ │ └── 48 GPIO27 -> MUX_USB3-1_SEL
│ └── MUX_USB3-1_OEn (GPIO17)
│ └── 50 GPIO17 -> MUX_USB3-1_OEn
├── PCIe Gen2 x1 (11 pins)
│ ├── Control
│ │ ├── 102 PCIe_nCLKREQ -> PCIE.nCLKREQ
│ │ ├── 104 PCIE_nWAKE -> PCIE.nWAKE
│ │ └── 109 PCIe_nRST -> PCIE_nRST
│ ├── Power enable
│ │ └── 106 PCIE_PWR_EN -> PCIE.PWR_EN
│ ├── Lanes
│ │ ├── 110 PCIe_CLK_P -> WIFI_PCIE.CLK_P
│ │ ├── 112 PCIe_CLK_N -> WIFI_PCIE.CLK_N
│ │ ├── 116 PCIe_RX_P -> WIFI_PCIE.RX_P
│ │ ├── 118 PCIe_RX_N -> WIFI_PCIE.RX_N
│ │ ├── 122 PCIe_TX_P -> WIFI_PCIE.TX_P
│ │ └── 124 PCIe_TX_N -> WIFI_PCIE.TX_N
│ └── VBUS_EN
│ └── 111 VBUS_EN -> 3v3_PWR_EN
├── M.2 / PCIe control (2 pins)
│ ├── BT_REG_ON (GPIO25)
│ │ └── 41 GPIO25 -> PCIE.BT_REG_ON
│ └── WL_REG_ON (GPIO24)
│ └── 45 GPIO24 -> PCIE.WL_REG_ON
├── PiProbe debug (2 pins)
│ ├── DEBUG_BOOT (GPIO22)
│ │ └── 46 GPIO22 -> DEBUG_BOOT
│ └── DEBUG_RST (GPIO23)
│ └── 47 GPIO23 -> DEBUG_RST
├── Scaffold dock (J2) (7 pins)
│ ├── MCU_RST (GPIO21)
│ │ └── 25 GPIO21 -> MCU_RST
│ ├── SPARE.IO0 (ID_SD)
│ │ └── 36 ID_SD -> SPARE.IO0
│ ├── SPARE.IO15 (GPIO15)
│ │ └── 51 GPIO15 -> SPARE.IO15
│ ├── SPARE.IO4 (GPIO4)
│ │ └── 54 GPIO4 -> SPARE.IO4
│ ├── SPARE.IO14 (GPIO14)
│ │ └── 55 GPIO14 -> SPARE.IO14
│ ├── MCU_BOOT (CAM_GPIO0)
│ │ └── 97 CAM_GPIO0 -> MCU_BOOT
│ └── PS2 enable (CAM_GPIO1)
│ └── 100 CAM_GPIO1 -> +PS2_EN_IO35
├── System (12 pins)
│ ├── Unused
│ │ ├── 16 FAN_TACHO -> (n.c.)
│ │ ├── 19 FAN_PWM -> (n.c.)
│ │ ├── 24 GPIO26 -> (n.c.)
│ │ ├── 89 WiFi_nDisable -> (n.c.)
│ │ ├── 91 BT_nDisable -> (n.c.)
│ │ ├── 93 nRPIBOOT -> (n.c.)
│ │ ├── 94 CC1 -> (n.c.)
│ │ └── 96 CC2 -> (n.c.)
│ ├── EEPROM_nWP
│ │ └── 20 EEPROM_nWP -> EEPROM_nWP
│ ├── EXPD_NRST (ID_SC)
│ │ └── 35 ID_SC -> EXPD_NRST.IO1
│ ├── PWR_BUT
│ │ └── 92 PWR_BUT -> PWR_BUT
│ └── LED_nPWR
│ └── 95 LED_nPWR -> nPWR_LED
├── HDMI (unused) (24 pins)
│ └── pins 143, 145, 146, 147, 148, 149, 151, 152, 153, 154, 158, 160, 164, 166, 170, 172, 176, 178, 182, 184, 188, 190, 199, 200
│ (Headless design — HDMI0/HDMI1 not brought out)
└── MIPI CSI/DSI (unused) (20 pins)
└── pins 115, 117, 121, 123, 127, 129, 133, 135, 139, 141, 175, 177, 181, 183, 187, 189, 193, 194, 195, 196
(No camera/display connectors fitted)
Subsystem notes
Power
- Unused — VBAT RTC backup — not connected (no RTC battery)
- Unused — PMIC_ENABLE — not connected
- 5 V input — Main 5 V from +PS4_SENS (PS4 input, fused 6.3 A, INA228-metered)
- GPIO_VREF — GPIO bank reference — strapped on CM5_GPIO sheet (3.3 V logic)
- 3.3 V output — CM5 3.3 V out (600 mA max) — I2C pull-ups, misc logic
- 1.8 V output — CM5 1.8 V out — unused
Ethernet (GigE)
- Pair 3 — To HR911130A magjack J6 (TRD3)
- Pair 1 — To HR911130A magjack J6 (TRD1)
- Pair 2 — To HR911130A magjack J6 (TRD2) — note P/N crossed vs pin name
- Pair 0 — To HR911130A magjack J6 (TRD0)
- LEDs — Green speed LED in RJ45 bezel
- LEDs — Yellow speed LED in RJ45 bezel
- LEDs — Activity LED (LED_nACT)
- Unused — Ethernet SYNC_OUT — not used
microSD (CM5 Lite)
- SDIO 4-bit — Molex 503398-1892 socket J5, SDR25 @50 MHz
- Unused — SD_DAT4-7 not used (4-bit bus)
- Unused — SD_VDD_Override not used
- Power — Enables RT9742 switch gating 3v3 to SD socket
I2C buses
- SENSOR_I2C-2 (GPIO13/12) — Sensor molecule bus: N2 + N4 8x8 Bosch-standard slots
- SENSOR_I2C-2 INT (GPIO16) — Shared interrupt from sensor slots
- PWR_I2C-1 (GPIO2/3) — Power telemetry bus: 4x INA228 @ 0x40/0x44/0x41/0x45 (internal 1.8k pulls on CM5)
- LED_I2C-0 (SCL0/SDA0) — TCA6424A LED expander @ 0x22 (+ CM5 ID EEPROM bus)
CAN FD (SPI4)
- Interrupts — MCP251863 nINT / nINT0(RX) / nINT1(TX)
- SPI — MCP251863 CAN-FD controller U15: SCK/nCS/SDO/SDI
I2S microphone
- MIC_I2S-0 (GPIO19/20/18) — N3 Carrier_I2S MEMS mic slot (mono, SEL=GND)
USB 2.0 OTG
- USB_OTG ID — OTG ID strap (0 = host) — CM5 USB2 hosts the PiProbe
- USB2 D± — Dedicated USB2 port -> PiProbe N1 (CMSIS-DAP + UART bridge)
USB3-0 (USB-C J10)
- SuperSpeed + D± — Via HD3SS3212 orientation mux; TUSB321 CC (DFP host, 3 A); VBUS from PS2 via TPS25940 eFuse + Q2
USB3-1 (USB-A J9)
- SuperSpeed + D± — SS lanes direct to USB-A; D± via TMUXHS221 mux (shared with M.2 Bluetooth USB)
USB3-1 mux control
- MUX_USB3-1_SEL (GPIO27) — TMUXHS221: routes CM5 USB3-1 D± to USB-A (NO) or M.2 Bluetooth (NC)
- MUX_USB3-1_OEn (GPIO17) — TMUXHS221 output enable, active low
PCIe Gen2 x1
- Control — nCLKREQ / nWAKE / nRST to M.2
- Power enable — Enables AP3441 buck U14 -> 3.3 V to M.2 slot
- Lanes — CLK/RX/TX pairs to M.2 Key-E slot J8 (Wi-Fi, e.g. AX210)
- VBUS_EN — Enables AP3441 buck U5 -> board +3v3 rail
M.2 / PCIe control
- BT_REG_ON (GPIO25) — Bluetooth regulator enable to M.2 Key-E
- WL_REG_ON (GPIO24) — Wi-Fi regulator enable to M.2 Key-E
PiProbe debug
- DEBUG_BOOT (GPIO22) — BOOTSEL strap of on-board PiProbe RP2040 (N1)
- DEBUG_RST (GPIO23) — Reset of on-board PiProbe RP2040 (N1)
Scaffold dock (J2)
- MCU_RST (GPIO21) — Direct reset of Scaffold RP2350 via J2.5
- SPARE.IO0 (ID_SD) — Spare GPIO to J2.1 via jumper JP1
- SPARE.IO15 (GPIO15) — Spare GPIO to J2.7 via JP4 (alt: UART0 RX console)
- SPARE.IO4 (GPIO4) — Spare GPIO to J2.2 via jumper JP2
- SPARE.IO14 (GPIO14) — Spare GPIO to J2.6 via JP3 (alt: UART0 TX console)
- MCU_BOOT (CAM_GPIO0) — Boot strap of Scaffold RP2350 via J2.4
- PS2 enable (CAM_GPIO1) — Drives NSi8210 isolator -> TPS22990 switch: PS2 rail to Scaffold blade P2
System
- Unused — Fan tach/PWM — not used
- Unused — GPIO26 — unconnected (only free GPIO)
- Unused — WiFi/BT nDisable — not used (M.2 module instead of onboard radio)
- Unused — nRPIBOOT — not broken out (CM5 Lite + SD workflow assumed)
- Unused — CM5 CC1/CC2 — unused, USB-C CC handled by TUSB321
- EEPROM_nWP — CM5 EEPROM write protect, jumper JP5 to GND
- EXPD_NRST (ID_SC) — TCA6424A LED expander reset (force_eeprom_read=0)
- PWR_BUT — Power button SW1 (SKRPACE010)
- LED_nPWR — Power LED via Q1 SS8550 buffer
HDMI (unused)
- Headless design — HDMI0/HDMI1 not brought out
MIPI CSI/DSI (unused)
- No camera/display connectors fitted
Appendix: J4 — CM5A (pins 1–100)
| Pin | CM5 function | Board net | Subsystem |
|---|---|---|---|
| 1 | GND | GND |
Ground |
| 2 | GND | GND |
Ground |
| 3 | Ethernet_Pair3_P | ETH.TRD3_P |
Ethernet (GigE) |
| 4 | Ethernet_Pair1_P | ETH.TRD1_P |
Ethernet (GigE) |
| 5 | Ethernet_Pair3_N | ETH.TRD3_N |
Ethernet (GigE) |
| 6 | Ethernet_Pair1_N | ETH.TRD1_N |
Ethernet (GigE) |
| 7 | GND | GND |
Ground |
| 8 | GND | GND |
Ground |
| 9 | Ethernet_Pair2_N | ETH.TRD2_P |
Ethernet (GigE) |
| 10 | Ethernet_Pair0_N | ETH.TRD0_N |
Ethernet (GigE) |
| 11 | Ethernet_Pair2_P | ETH.TRD2_N |
Ethernet (GigE) |
| 12 | Ethernet_Pair0_P | ETH.TRD0_P |
Ethernet (GigE) |
| 13 | GND | GND |
Ground |
| 14 | GND | GND |
Ground |
| 15 | Ethernet_nLED3(3.3v) | ETH_LEDG |
Ethernet (GigE) |
| 16 | FAN_TACHO | *n.c.* |
System |
| 17 | Ethernet_nLED2(3.3v) | ETH_LEDY |
Ethernet (GigE) |
| 18 | Ethernet_SYNC_OUT(3.3v) | *n.c.* |
Ethernet (GigE) |
| 19 | FAN_PWM | *n.c.* |
System |
| 20 | EEPROM_nWP | EEPROM_nWP |
System |
| 21 | LED_nACT | LED_nACT |
Ethernet (GigE) |
| 22 | GND | GND |
Ground |
| 23 | GND | GND |
Ground |
| 24 | GPIO26 | *n.c.* |
System |
| 25 | GPIO21 | MCU_RST |
Scaffold dock (J2) |
| 26 | GPIO19 | MIC_I2S-0.WS |
I2S microphone |
| 27 | GPIO20 | MIC_I2S-0.SD |
I2S microphone |
| 28 | GPIO13 | SENSOR_I2C-2.SCL |
I2C buses |
| 29 | GPIO16 | SENSOR_I2C-2.INT |
I2C buses |
| 30 | GPIO6 | CAN_SPI-4.nINT0 |
CAN FD (SPI4) |
| 31 | GPIO12 | SENSOR_I2C-2.SDA |
I2C buses |
| 32 | GND | GND |
Ground |
| 33 | GND | GND |
Ground |
| 34 | GPIO5 | CAN_SPI-4.nINT |
CAN FD (SPI4) |
| 35 | ID_SC | EXPD_NRST.IO1 |
System |
| 36 | ID_SD | SPARE.IO0 |
Scaffold dock (J2) |
| 37 | GPIO7 | CAN_SPI-4.nINT1 |
CAN FD (SPI4) |
| 38 | GPIO11 | CAN_SPI-4.SCK |
CAN FD (SPI4) |
| 39 | GPIO8 | CAN_SPI-4.nCS |
CAN FD (SPI4) |
| 40 | GPIO9 | CAN_SPI-4.SDO |
CAN FD (SPI4) |
| 41 | GPIO25 | PCIE.BT_REG_ON |
M.2 / PCIe control |
| 42 | GND | GND |
Ground |
| 43 | GND | GND |
Ground |
| 44 | GPIO10 | CAN_SPI-4.SDI |
CAN FD (SPI4) |
| 45 | GPIO24 | PCIE.WL_REG_ON |
M.2 / PCIe control |
| 46 | GPIO22 | DEBUG_BOOT |
PiProbe debug |
| 47 | GPIO23 | DEBUG_RST |
PiProbe debug |
| 48 | GPIO27 | MUX_USB3-1_SEL |
USB3-1 mux control |
| 49 | GPIO18 | MIC_I2S-0.SCK |
I2S microphone |
| 50 | GPIO17 | MUX_USB3-1_OEn |
USB3-1 mux control |
| 51 | GPIO15 | SPARE.IO15 |
Scaffold dock (J2) |
| 52 | GND | GND |
Ground |
| 53 | GND | GND |
Ground |
| 54 | GPIO4 | SPARE.IO4 |
Scaffold dock (J2) |
| 55 | GPIO14 | SPARE.IO14 |
Scaffold dock (J2) |
| 56 | GPIO3 | PWR_I2C-1.SCL |
I2C buses |
| 57 | SD_CLK | SD_CLK |
microSD (CM5 Lite) |
| 58 | GPIO2 | PWR_I2C-1.SDA |
I2C buses |
| 59 | GND | GND |
Ground |
| 60 | GND | GND |
Ground |
| 61 | SD_DAT3 | SD_DAT3 |
microSD (CM5 Lite) |
| 62 | SD_CMD | SD_CMD |
microSD (CM5 Lite) |
| 63 | SD_DAT0 | SD_DAT0 |
microSD (CM5 Lite) |
| 64 | SD_DAT5 | *n.c.* |
microSD (CM5 Lite) |
| 65 | GND | GND |
Ground |
| 66 | GND | GND |
Ground |
| 67 | SD_DAT1 | SD_DAT1 |
microSD (CM5 Lite) |
| 68 | SD_DAT4 | *n.c.* |
microSD (CM5 Lite) |
| 69 | SD_DAT2 | SD_DAT2 |
microSD (CM5 Lite) |
| 70 | SD_DAT7 | *n.c.* |
microSD (CM5 Lite) |
| 71 | GND | GND |
Ground |
| 72 | SD_DAT6 | *n.c.* |
microSD (CM5 Lite) |
| 73 | SD_VDD_Override | *n.c.* |
microSD (CM5 Lite) |
| 74 | GND | GND |
Ground |
| 75 | SD_PWR_ON | SD_PWR_ON |
microSD (CM5 Lite) |
| 76 | VBAT | *n.c.* |
Power |
| 77 | +5v_(Input) | +PS4_SENS |
Power |
| 78 | GPIO_VREF(1.8v/3.3v_Input) | GPIO_VREF |
Power |
| 79 | +5v_(Input) | +PS4_SENS |
Power |
| 80 | SCL0 | LED_I2C-0.SCL |
I2C buses |
| 81 | +5v_(Input) | +PS4_SENS |
Power |
| 82 | SDA0 | LED_I2C-0.SDA |
I2C buses |
| 83 | +5v_(Input) | +PS4_SENS |
Power |
| 84 | +3.3v_(Output) | +3v3_CM5 |
Power |
| 85 | +5v_(Input) | +PS4_SENS |
Power |
| 86 | +3.3v_(Output) | +3v3_CM5 |
Power |
| 87 | +5v_(Input) | +PS4_SENS |
Power |
| 88 | +1.8v_(Output) | *n.c.* |
Power |
| 89 | WiFi_nDisable | *n.c.* |
System |
| 90 | +1.8v_(Output) | *n.c.* |
Power |
| 91 | BT_nDisable | *n.c.* |
System |
| 92 | PWR_BUT | PWR_BUT |
System |
| 93 | nRPIBOOT | *n.c.* |
System |
| 94 | CC1 | *n.c.* |
System |
| 95 | LED_nPWR | nPWR_LED |
System |
| 96 | CC2 | *n.c.* |
System |
| 97 | CAM_GPIO0 | MCU_BOOT |
Scaffold dock (J2) |
| 98 | GND | GND |
Ground |
| 99 | PMIC_ENABLE | *n.c.* |
Power |
| 100 | CAM_GPIO1 | +PS2_EN_IO35 |
Scaffold dock (J2) |
Appendix: J7 — CM5B (pins 101–200)
| Pin | CM5 function | Board net | Subsystem |
|---|---|---|---|
| 101 | USB_OTG_ID | USB_OTG |
USB 2.0 OTG |
| 102 | PCIe_nCLKREQ | PCIE.nCLKREQ |
PCIe Gen2 x1 |
| 103 | USB2_N | DEBUG_USB2_N |
USB 2.0 OTG |
| 104 | PCIE_nWAKE | PCIE.nWAKE |
PCIe Gen2 x1 |
| 105 | USB2_P | DEBUG_USB2_P |
USB 2.0 OTG |
| 106 | PCIE_PWR_EN | PCIE.PWR_EN |
PCIe Gen2 x1 |
| 107 | GND | GND |
Ground |
| 108 | GND | GND |
Ground |
| 109 | PCIe_nRST | PCIE_nRST |
PCIe Gen2 x1 |
| 110 | PCIe_CLK_P | WIFI_PCIE.CLK_P |
PCIe Gen2 x1 |
| 111 | VBUS_EN | 3v3_PWR_EN |
PCIe Gen2 x1 |
| 112 | PCIe_CLK_N | WIFI_PCIE.CLK_N |
PCIe Gen2 x1 |
| 113 | GND | GND |
Ground |
| 114 | GND | GND |
Ground |
| 115 | MIPI0_D0_N | *n.c.* |
MIPI CSI/DSI (unused) |
| 116 | PCIe_RX_P | WIFI_PCIE.RX_P |
PCIe Gen2 x1 |
| 117 | MIPI0_D0_P | *n.c.* |
MIPI CSI/DSI (unused) |
| 118 | PCIe_RX_N | WIFI_PCIE.RX_N |
PCIe Gen2 x1 |
| 119 | GND | GND |
Ground |
| 120 | GND | GND |
Ground |
| 121 | MIPI0_D1_N | *n.c.* |
MIPI CSI/DSI (unused) |
| 122 | PCIe_TX_P | WIFI_PCIE.TX_P |
PCIe Gen2 x1 |
| 123 | MIPI0_D1_P | *n.c.* |
MIPI CSI/DSI (unused) |
| 124 | PCIe_TX_N | WIFI_PCIE.TX_N |
PCIe Gen2 x1 |
| 125 | GND | GND |
Ground |
| 126 | GND | GND |
Ground |
| 127 | MIPI0_C_N | *n.c.* |
MIPI CSI/DSI (unused) |
| 128 | USB3-0-RX_N | USER_USB3-0.RX_N |
USB3-0 (USB-C J10) |
| 129 | MIPI0_C_P | *n.c.* |
MIPI CSI/DSI (unused) |
| 130 | USB3-0-RX_P | USER_USB3-0.RX_P |
USB3-0 (USB-C J10) |
| 131 | GND | GND |
Ground |
| 132 | GND | GND |
Ground |
| 133 | MIPI0_D2_N | *n.c.* |
MIPI CSI/DSI (unused) |
| 134 | USB3-0-D_P | USER_USB3-0.D_P |
USB3-0 (USB-C J10) |
| 135 | MIPI0_D2_P | *n.c.* |
MIPI CSI/DSI (unused) |
| 136 | USB3-0-D_N | USER_USB3-0.D_N |
USB3-0 (USB-C J10) |
| 137 | GND | GND |
Ground |
| 138 | GND | GND |
Ground |
| 139 | MIPI0_D3_N | *n.c.* |
MIPI CSI/DSI (unused) |
| 140 | USB3-0-TX_N | USER_USB3-0.TX_N |
USB3-0 (USB-C J10) |
| 141 | MIPI0_D3_P | *n.c.* |
MIPI CSI/DSI (unused) |
| 142 | USB3-0-TX_P | USER_USB3-0.TX_P |
USB3-0 (USB-C J10) |
| 143 | HDMI1_HOTPLUG | *n.c.* |
HDMI (unused) |
| 144 | GND | GND |
Ground |
| 145 | HDMI1_SDA | *n.c.* |
HDMI (unused) |
| 146 | HDMI1_TX2_P | *n.c.* |
HDMI (unused) |
| 147 | HDMI1_SCL | *n.c.* |
HDMI (unused) |
| 148 | HDMI1_TX2_N | *n.c.* |
HDMI (unused) |
| 149 | HDMI1_CEC | *n.c.* |
HDMI (unused) |
| 150 | GND | GND |
Ground |
| 151 | HDMI0_CEC | *n.c.* |
HDMI (unused) |
| 152 | HDMI1_TX1_P | *n.c.* |
HDMI (unused) |
| 153 | HDMI0_HOTPLUG | *n.c.* |
HDMI (unused) |
| 154 | HDMI1_TX1_N | *n.c.* |
HDMI (unused) |
| 155 | GND | GND |
Ground |
| 156 | GND | GND |
Ground |
| 157 | USB3-1-RX_N | USER_USB3-1.RX_N |
USB3-1 (USB-A J9) |
| 158 | HDMI1_TX0_P | *n.c.* |
HDMI (unused) |
| 159 | USB3-1-RX_P | USER_USB3-1.RX_P |
USB3-1 (USB-A J9) |
| 160 | HDMI1_TX0_N | *n.c.* |
HDMI (unused) |
| 161 | GND | GND |
Ground |
| 162 | GND | GND |
Ground |
| 163 | USB3-1-D_P | MUX_USB3-1.D_P |
USB3-1 (USB-A J9) |
| 164 | HDMI1_CLK_P | *n.c.* |
HDMI (unused) |
| 165 | USB3-1-D_N | MUX_USB3-1.D_N |
USB3-1 (USB-A J9) |
| 166 | HDMI1_CLK_N | *n.c.* |
HDMI (unused) |
| 167 | GND | GND |
Ground |
| 168 | GND | GND |
Ground |
| 169 | USB3-1-TX_N | USER_USB3-1.TX_N |
USB3-1 (USB-A J9) |
| 170 | HDMI0_TX2_P | *n.c.* |
HDMI (unused) |
| 171 | USB3-1-TX_P | USER_USB3-1.TX_P |
USB3-1 (USB-A J9) |
| 172 | HDMI0_TX2_N | *n.c.* |
HDMI (unused) |
| 173 | GND | GND |
Ground |
| 174 | GND | GND |
Ground |
| 175 | MIPI1_D0_N | *n.c.* |
MIPI CSI/DSI (unused) |
| 176 | HDMI0_TX1_P | *n.c.* |
HDMI (unused) |
| 177 | MIPI1_D0_P | *n.c.* |
MIPI CSI/DSI (unused) |
| 178 | HDMI0_TX1_N | *n.c.* |
HDMI (unused) |
| 179 | GND | GND |
Ground |
| 180 | GND | GND |
Ground |
| 181 | MIPI1_D1_N | *n.c.* |
MIPI CSI/DSI (unused) |
| 182 | HDMI0_TX0_P | *n.c.* |
HDMI (unused) |
| 183 | MIPI1_D1_P | *n.c.* |
MIPI CSI/DSI (unused) |
| 184 | HDMI0_TX0_N | *n.c.* |
HDMI (unused) |
| 185 | GND | GND |
Ground |
| 186 | GND | GND |
Ground |
| 187 | MIPI1_C_N | *n.c.* |
MIPI CSI/DSI (unused) |
| 188 | HDMI0_CLK_P | *n.c.* |
HDMI (unused) |
| 189 | MIPI1_C_P | *n.c.* |
MIPI CSI/DSI (unused) |
| 190 | HDMI0_CLK_N | *n.c.* |
HDMI (unused) |
| 191 | GND | GND |
Ground |
| 192 | GND | GND |
Ground |
| 193 | MIPI1_D2_N | *n.c.* |
MIPI CSI/DSI (unused) |
| 194 | MIPI1_D3_N | *n.c.* |
MIPI CSI/DSI (unused) |
| 195 | MIPI1_D2_P | *n.c.* |
MIPI CSI/DSI (unused) |
| 196 | MIPI1_D3_P | *n.c.* |
MIPI CSI/DSI (unused) |
| 197 | GND | GND |
Ground |
| 198 | GND | GND |
Ground |
| 199 | HDMI0_SDA | *n.c.* |
HDMI (unused) |
| 200 | HDMI0_SCL | *n.c.* |
HDMI (unused) |
# CM5 Pinout Tree Map — Control-Panel Workcell V2.0.1
Compute Module 5 on two Hirose 100-pin board-to-board connectors:
**J4** = CM5A (pins 1–100, low-speed/GPIO side), **J7** = CM5B (pins 101–200, high-speed side).
Net names are the board schematic nets; generated from the routed PCB netlist (DRC-clean).
## Tree map by subsystem
```text
CM5 (J4 + J7, 200 pins)
├── Power (13 pins)
│ ├── Unused
│ │ ├── 76 VBAT -> (n.c.)
│ │ └── 99 PMIC_ENABLE -> (n.c.)
│ ├── 5 V input
│ │ ├── 77 +5v_(Input) -> +PS4_SENS
│ │ ├── 79 +5v_(Input) -> +PS4_SENS
│ │ ├── 81 +5v_(Input) -> +PS4_SENS
│ │ ├── 83 +5v_(Input) -> +PS4_SENS
│ │ ├── 85 +5v_(Input) -> +PS4_SENS
│ │ └── 87 +5v_(Input) -> +PS4_SENS
│ ├── GPIO_VREF
│ │ └── 78 GPIO_VREF(1.8v/3.3v_Input) -> GPIO_VREF
│ ├── 3.3 V output
│ │ ├── 84 +3.3v_(Output) -> +3v3_CM5
│ │ └── 86 +3.3v_(Output) -> +3v3_CM5
│ └── 1.8 V output
│ ├── 88 +1.8v_(Output) -> (n.c.)
│ └── 90 +1.8v_(Output) -> (n.c.)
├── Ground — 51 pins
│ └── pins 1-2, 7-8, 13-14, 22-23, 32-33, 42-43, 52-53, 59-60, 65-66, 71, 74, 98, 107-108, 113-114, 119-120, 125-126, 131-132, 137-138, 144, 150, 155-156, 161-162, 167-168, 173-174, 179-180, 185-186, 191-192, 197-198
├── Ethernet (GigE) (12 pins)
│ ├── Pair 3
│ │ ├── 3 Ethernet_Pair3_P -> ETH.TRD3_P
│ │ └── 5 Ethernet_Pair3_N -> ETH.TRD3_N
│ ├── Pair 1
│ │ ├── 4 Ethernet_Pair1_P -> ETH.TRD1_P
│ │ └── 6 Ethernet_Pair1_N -> ETH.TRD1_N
│ ├── Pair 2
│ │ ├── 9 Ethernet_Pair2_N -> ETH.TRD2_P
│ │ └── 11 Ethernet_Pair2_P -> ETH.TRD2_N
│ ├── Pair 0
│ │ ├── 10 Ethernet_Pair0_N -> ETH.TRD0_N
│ │ └── 12 Ethernet_Pair0_P -> ETH.TRD0_P
│ ├── LEDs
│ │ ├── 15 Ethernet_nLED3(3.3v) -> ETH_LEDG
│ │ ├── 17 Ethernet_nLED2(3.3v) -> ETH_LEDY
│ │ └── 21 LED_nACT -> LED_nACT
│ └── Unused
│ └── 18 Ethernet_SYNC_OUT(3.3v) -> (n.c.)
├── microSD (CM5 Lite) (12 pins)
│ ├── SDIO 4-bit
│ │ ├── 57 SD_CLK -> SD_CLK
│ │ ├── 61 SD_DAT3 -> SD_DAT3
│ │ ├── 62 SD_CMD -> SD_CMD
│ │ ├── 63 SD_DAT0 -> SD_DAT0
│ │ ├── 67 SD_DAT1 -> SD_DAT1
│ │ └── 69 SD_DAT2 -> SD_DAT2
│ ├── Unused
│ │ ├── 64 SD_DAT5 -> (n.c.)
│ │ ├── 68 SD_DAT4 -> (n.c.)
│ │ ├── 70 SD_DAT7 -> (n.c.)
│ │ ├── 72 SD_DAT6 -> (n.c.)
│ │ └── 73 SD_VDD_Override -> (n.c.)
│ └── Power
│ └── 75 SD_PWR_ON -> SD_PWR_ON
├── I2C buses (7 pins)
│ ├── SENSOR_I2C-2 (GPIO13/12)
│ │ ├── 28 GPIO13 -> SENSOR_I2C-2.SCL
│ │ └── 31 GPIO12 -> SENSOR_I2C-2.SDA
│ ├── SENSOR_I2C-2 INT (GPIO16)
│ │ └── 29 GPIO16 -> SENSOR_I2C-2.INT
│ ├── PWR_I2C-1 (GPIO2/3)
│ │ ├── 56 GPIO3 -> PWR_I2C-1.SCL
│ │ └── 58 GPIO2 -> PWR_I2C-1.SDA
│ └── LED_I2C-0 (SCL0/SDA0)
│ ├── 80 SCL0 -> LED_I2C-0.SCL
│ └── 82 SDA0 -> LED_I2C-0.SDA
├── CAN FD (SPI4) (7 pins)
│ ├── Interrupts
│ │ ├── 30 GPIO6 -> CAN_SPI-4.nINT0
│ │ ├── 34 GPIO5 -> CAN_SPI-4.nINT
│ │ └── 37 GPIO7 -> CAN_SPI-4.nINT1
│ └── SPI
│ ├── 38 GPIO11 -> CAN_SPI-4.SCK
│ ├── 39 GPIO8 -> CAN_SPI-4.nCS
│ ├── 40 GPIO9 -> CAN_SPI-4.SDO
│ └── 44 GPIO10 -> CAN_SPI-4.SDI
├── I2S microphone (3 pins)
│ └── MIC_I2S-0 (GPIO19/20/18)
│ ├── 26 GPIO19 -> MIC_I2S-0.WS
│ ├── 27 GPIO20 -> MIC_I2S-0.SD
│ └── 49 GPIO18 -> MIC_I2S-0.SCK
├── USB 2.0 OTG (3 pins)
│ ├── USB_OTG ID
│ │ └── 101 USB_OTG_ID -> USB_OTG
│ └── USB2 D±
│ ├── 103 USB2_N -> DEBUG_USB2_N
│ └── 105 USB2_P -> DEBUG_USB2_P
├── USB3-0 (USB-C J10) (6 pins)
│ └── SuperSpeed + D±
│ ├── 128 USB3-0-RX_N -> USER_USB3-0.RX_N
│ ├── 130 USB3-0-RX_P -> USER_USB3-0.RX_P
│ ├── 134 USB3-0-D_P -> USER_USB3-0.D_P
│ ├── 136 USB3-0-D_N -> USER_USB3-0.D_N
│ ├── 140 USB3-0-TX_N -> USER_USB3-0.TX_N
│ └── 142 USB3-0-TX_P -> USER_USB3-0.TX_P
├── USB3-1 (USB-A J9) (6 pins)
│ └── SuperSpeed + D±
│ ├── 157 USB3-1-RX_N -> USER_USB3-1.RX_N
│ ├── 159 USB3-1-RX_P -> USER_USB3-1.RX_P
│ ├── 163 USB3-1-D_P -> MUX_USB3-1.D_P
│ ├── 165 USB3-1-D_N -> MUX_USB3-1.D_N
│ ├── 169 USB3-1-TX_N -> USER_USB3-1.TX_N
│ └── 171 USB3-1-TX_P -> USER_USB3-1.TX_P
├── USB3-1 mux control (2 pins)
│ ├── MUX_USB3-1_SEL (GPIO27)
│ │ └── 48 GPIO27 -> MUX_USB3-1_SEL
│ └── MUX_USB3-1_OEn (GPIO17)
│ └── 50 GPIO17 -> MUX_USB3-1_OEn
├── PCIe Gen2 x1 (11 pins)
│ ├── Control
│ │ ├── 102 PCIe_nCLKREQ -> PCIE.nCLKREQ
│ │ ├── 104 PCIE_nWAKE -> PCIE.nWAKE
│ │ └── 109 PCIe_nRST -> PCIE_nRST
│ ├── Power enable
│ │ └── 106 PCIE_PWR_EN -> PCIE.PWR_EN
│ ├── Lanes
│ │ ├── 110 PCIe_CLK_P -> WIFI_PCIE.CLK_P
│ │ ├── 112 PCIe_CLK_N -> WIFI_PCIE.CLK_N
│ │ ├── 116 PCIe_RX_P -> WIFI_PCIE.RX_P
│ │ ├── 118 PCIe_RX_N -> WIFI_PCIE.RX_N
│ │ ├── 122 PCIe_TX_P -> WIFI_PCIE.TX_P
│ │ └── 124 PCIe_TX_N -> WIFI_PCIE.TX_N
│ └── VBUS_EN
│ └── 111 VBUS_EN -> 3v3_PWR_EN
├── M.2 / PCIe control (2 pins)
│ ├── BT_REG_ON (GPIO25)
│ │ └── 41 GPIO25 -> PCIE.BT_REG_ON
│ └── WL_REG_ON (GPIO24)
│ └── 45 GPIO24 -> PCIE.WL_REG_ON
├── PiProbe debug (2 pins)
│ ├── DEBUG_BOOT (GPIO22)
│ │ └── 46 GPIO22 -> DEBUG_BOOT
│ └── DEBUG_RST (GPIO23)
│ └── 47 GPIO23 -> DEBUG_RST
├── Scaffold dock (J2) (7 pins)
│ ├── MCU_RST (GPIO21)
│ │ └── 25 GPIO21 -> MCU_RST
│ ├── SPARE.IO0 (ID_SD)
│ │ └── 36 ID_SD -> SPARE.IO0
│ ├── SPARE.IO15 (GPIO15)
│ │ └── 51 GPIO15 -> SPARE.IO15
│ ├── SPARE.IO4 (GPIO4)
│ │ └── 54 GPIO4 -> SPARE.IO4
│ ├── SPARE.IO14 (GPIO14)
│ │ └── 55 GPIO14 -> SPARE.IO14
│ ├── MCU_BOOT (CAM_GPIO0)
│ │ └── 97 CAM_GPIO0 -> MCU_BOOT
│ └── PS2 enable (CAM_GPIO1)
│ └── 100 CAM_GPIO1 -> +PS2_EN_IO35
├── System (12 pins)
│ ├── Unused
│ │ ├── 16 FAN_TACHO -> (n.c.)
│ │ ├── 19 FAN_PWM -> (n.c.)
│ │ ├── 24 GPIO26 -> (n.c.)
│ │ ├── 89 WiFi_nDisable -> (n.c.)
│ │ ├── 91 BT_nDisable -> (n.c.)
│ │ ├── 93 nRPIBOOT -> (n.c.)
│ │ ├── 94 CC1 -> (n.c.)
│ │ └── 96 CC2 -> (n.c.)
│ ├── EEPROM_nWP
│ │ └── 20 EEPROM_nWP -> EEPROM_nWP
│ ├── EXPD_NRST (ID_SC)
│ │ └── 35 ID_SC -> EXPD_NRST.IO1
│ ├── PWR_BUT
│ │ └── 92 PWR_BUT -> PWR_BUT
│ └── LED_nPWR
│ └── 95 LED_nPWR -> nPWR_LED
├── HDMI (unused) (24 pins)
│ └── pins 143, 145, 146, 147, 148, 149, 151, 152, 153, 154, 158, 160, 164, 166, 170, 172, 176, 178, 182, 184, 188, 190, 199, 200
│ (Headless design — HDMI0/HDMI1 not brought out)
└── MIPI CSI/DSI (unused) (20 pins)
└── pins 115, 117, 121, 123, 127, 129, 133, 135, 139, 141, 175, 177, 181, 183, 187, 189, 193, 194, 195, 196
(No camera/display connectors fitted)
```
## Subsystem notes
### Power
- **Unused** — VBAT RTC backup — not connected (no RTC battery)
- **Unused** — PMIC_ENABLE — not connected
- **5 V input** — Main 5 V from +PS4_SENS (PS4 input, fused 6.3 A, INA228-metered)
- **GPIO_VREF** — GPIO bank reference — strapped on CM5_GPIO sheet (3.3 V logic)
- **3.3 V output** — CM5 3.3 V out (600 mA max) — I2C pull-ups, misc logic
- **1.8 V output** — CM5 1.8 V out — unused
### Ethernet (GigE)
- **Pair 3** — To HR911130A magjack J6 (TRD3)
- **Pair 1** — To HR911130A magjack J6 (TRD1)
- **Pair 2** — To HR911130A magjack J6 (TRD2) — note P/N crossed vs pin name
- **Pair 0** — To HR911130A magjack J6 (TRD0)
- **LEDs** — Green speed LED in RJ45 bezel
- **LEDs** — Yellow speed LED in RJ45 bezel
- **LEDs** — Activity LED (LED_nACT)
- **Unused** — Ethernet SYNC_OUT — not used
### microSD (CM5 Lite)
- **SDIO 4-bit** — Molex 503398-1892 socket J5, SDR25 @50 MHz
- **Unused** — SD_DAT4-7 not used (4-bit bus)
- **Unused** — SD_VDD_Override not used
- **Power** — Enables RT9742 switch gating 3v3 to SD socket
### I2C buses
- **SENSOR_I2C-2 (GPIO13/12)** — Sensor molecule bus: N2 + N4 8x8 Bosch-standard slots
- **SENSOR_I2C-2 INT (GPIO16)** — Shared interrupt from sensor slots
- **PWR_I2C-1 (GPIO2/3)** — Power telemetry bus: 4x INA228 @ 0x40/0x44/0x41/0x45 (internal 1.8k pulls on CM5)
- **LED_I2C-0 (SCL0/SDA0)** — TCA6424A LED expander @ 0x22 (+ CM5 ID EEPROM bus)
### CAN FD (SPI4)
- **Interrupts** — MCP251863 nINT / nINT0(RX) / nINT1(TX)
- **SPI** — MCP251863 CAN-FD controller U15: SCK/nCS/SDO/SDI
### I2S microphone
- **MIC_I2S-0 (GPIO19/20/18)** — N3 Carrier_I2S MEMS mic slot (mono, SEL=GND)
### USB 2.0 OTG
- **USB_OTG ID** — OTG ID strap (0 = host) — CM5 USB2 hosts the PiProbe
- **USB2 D±** — Dedicated USB2 port -> PiProbe N1 (CMSIS-DAP + UART bridge)
### USB3-0 (USB-C J10)
- **SuperSpeed + D±** — Via HD3SS3212 orientation mux; TUSB321 CC (DFP host, 3 A); VBUS from PS2 via TPS25940 eFuse + Q2
### USB3-1 (USB-A J9)
- **SuperSpeed + D±** — SS lanes direct to USB-A; D± via TMUXHS221 mux (shared with M.2 Bluetooth USB)
### USB3-1 mux control
- **MUX_USB3-1_SEL (GPIO27)** — TMUXHS221: routes CM5 USB3-1 D± to USB-A (NO) or M.2 Bluetooth (NC)
- **MUX_USB3-1_OEn (GPIO17)** — TMUXHS221 output enable, active low
### PCIe Gen2 x1
- **Control** — nCLKREQ / nWAKE / nRST to M.2
- **Power enable** — Enables AP3441 buck U14 -> 3.3 V to M.2 slot
- **Lanes** — CLK/RX/TX pairs to M.2 Key-E slot J8 (Wi-Fi, e.g. AX210)
- **VBUS_EN** — Enables AP3441 buck U5 -> board +3v3 rail
### M.2 / PCIe control
- **BT_REG_ON (GPIO25)** — Bluetooth regulator enable to M.2 Key-E
- **WL_REG_ON (GPIO24)** — Wi-Fi regulator enable to M.2 Key-E
### PiProbe debug
- **DEBUG_BOOT (GPIO22)** — BOOTSEL strap of on-board PiProbe RP2040 (N1)
- **DEBUG_RST (GPIO23)** — Reset of on-board PiProbe RP2040 (N1)
### Scaffold dock (J2)
- **MCU_RST (GPIO21)** — Direct reset of Scaffold RP2350 via J2.5
- **SPARE.IO0 (ID_SD)** — Spare GPIO to J2.1 via jumper JP1
- **SPARE.IO15 (GPIO15)** — Spare GPIO to J2.7 via JP4 (alt: UART0 RX console)
- **SPARE.IO4 (GPIO4)** — Spare GPIO to J2.2 via jumper JP2
- **SPARE.IO14 (GPIO14)** — Spare GPIO to J2.6 via JP3 (alt: UART0 TX console)
- **MCU_BOOT (CAM_GPIO0)** — Boot strap of Scaffold RP2350 via J2.4
- **PS2 enable (CAM_GPIO1)** — Drives NSi8210 isolator -> TPS22990 switch: PS2 rail to Scaffold blade P2
### System
- **Unused** — Fan tach/PWM — not used
- **Unused** — GPIO26 — unconnected (only free GPIO)
- **Unused** — WiFi/BT nDisable — not used (M.2 module instead of onboard radio)
- **Unused** — nRPIBOOT — not broken out (CM5 Lite + SD workflow assumed)
- **Unused** — CM5 CC1/CC2 — unused, USB-C CC handled by TUSB321
- **EEPROM_nWP** — CM5 EEPROM write protect, jumper JP5 to GND
- **EXPD_NRST (ID_SC)** — TCA6424A LED expander reset (force_eeprom_read=0)
- **PWR_BUT** — Power button SW1 (SKRPACE010)
- **LED_nPWR** — Power LED via Q1 SS8550 buffer
### HDMI (unused)
- Headless design — HDMI0/HDMI1 not brought out
### MIPI CSI/DSI (unused)
- No camera/display connectors fitted
## Appendix: J4 — CM5A (pins 1–100)
| Pin | CM5 function | Board net | Subsystem |
|----:|--------------|-----------|-----------|
| 1 | GND | `GND` | Ground |
| 2 | GND | `GND` | Ground |
| 3 | Ethernet_Pair3_P | `ETH.TRD3_P` | Ethernet (GigE) |
| 4 | Ethernet_Pair1_P | `ETH.TRD1_P` | Ethernet (GigE) |
| 5 | Ethernet_Pair3_N | `ETH.TRD3_N` | Ethernet (GigE) |
| 6 | Ethernet_Pair1_N | `ETH.TRD1_N` | Ethernet (GigE) |
| 7 | GND | `GND` | Ground |
| 8 | GND | `GND` | Ground |
| 9 | Ethernet_Pair2_N | `ETH.TRD2_P` | Ethernet (GigE) |
| 10 | Ethernet_Pair0_N | `ETH.TRD0_N` | Ethernet (GigE) |
| 11 | Ethernet_Pair2_P | `ETH.TRD2_N` | Ethernet (GigE) |
| 12 | Ethernet_Pair0_P | `ETH.TRD0_P` | Ethernet (GigE) |
| 13 | GND | `GND` | Ground |
| 14 | GND | `GND` | Ground |
| 15 | Ethernet_nLED3(3.3v) | `ETH_LEDG` | Ethernet (GigE) |
| 16 | FAN_TACHO | `*n.c.*` | System |
| 17 | Ethernet_nLED2(3.3v) | `ETH_LEDY` | Ethernet (GigE) |
| 18 | Ethernet_SYNC_OUT(3.3v) | `*n.c.*` | Ethernet (GigE) |
| 19 | FAN_PWM | `*n.c.*` | System |
| 20 | EEPROM_nWP | `EEPROM_nWP` | System |
| 21 | LED_nACT | `LED_nACT` | Ethernet (GigE) |
| 22 | GND | `GND` | Ground |
| 23 | GND | `GND` | Ground |
| 24 | GPIO26 | `*n.c.*` | System |
| 25 | GPIO21 | `MCU_RST` | Scaffold dock (J2) |
| 26 | GPIO19 | `MIC_I2S-0.WS` | I2S microphone |
| 27 | GPIO20 | `MIC_I2S-0.SD` | I2S microphone |
| 28 | GPIO13 | `SENSOR_I2C-2.SCL` | I2C buses |
| 29 | GPIO16 | `SENSOR_I2C-2.INT` | I2C buses |
| 30 | GPIO6 | `CAN_SPI-4.nINT0` | CAN FD (SPI4) |
| 31 | GPIO12 | `SENSOR_I2C-2.SDA` | I2C buses |
| 32 | GND | `GND` | Ground |
| 33 | GND | `GND` | Ground |
| 34 | GPIO5 | `CAN_SPI-4.nINT` | CAN FD (SPI4) |
| 35 | ID_SC | `EXPD_NRST.IO1` | System |
| 36 | ID_SD | `SPARE.IO0` | Scaffold dock (J2) |
| 37 | GPIO7 | `CAN_SPI-4.nINT1` | CAN FD (SPI4) |
| 38 | GPIO11 | `CAN_SPI-4.SCK` | CAN FD (SPI4) |
| 39 | GPIO8 | `CAN_SPI-4.nCS` | CAN FD (SPI4) |
| 40 | GPIO9 | `CAN_SPI-4.SDO` | CAN FD (SPI4) |
| 41 | GPIO25 | `PCIE.BT_REG_ON` | M.2 / PCIe control |
| 42 | GND | `GND` | Ground |
| 43 | GND | `GND` | Ground |
| 44 | GPIO10 | `CAN_SPI-4.SDI` | CAN FD (SPI4) |
| 45 | GPIO24 | `PCIE.WL_REG_ON` | M.2 / PCIe control |
| 46 | GPIO22 | `DEBUG_BOOT` | PiProbe debug |
| 47 | GPIO23 | `DEBUG_RST` | PiProbe debug |
| 48 | GPIO27 | `MUX_USB3-1_SEL` | USB3-1 mux control |
| 49 | GPIO18 | `MIC_I2S-0.SCK` | I2S microphone |
| 50 | GPIO17 | `MUX_USB3-1_OEn` | USB3-1 mux control |
| 51 | GPIO15 | `SPARE.IO15` | Scaffold dock (J2) |
| 52 | GND | `GND` | Ground |
| 53 | GND | `GND` | Ground |
| 54 | GPIO4 | `SPARE.IO4` | Scaffold dock (J2) |
| 55 | GPIO14 | `SPARE.IO14` | Scaffold dock (J2) |
| 56 | GPIO3 | `PWR_I2C-1.SCL` | I2C buses |
| 57 | SD_CLK | `SD_CLK` | microSD (CM5 Lite) |
| 58 | GPIO2 | `PWR_I2C-1.SDA` | I2C buses |
| 59 | GND | `GND` | Ground |
| 60 | GND | `GND` | Ground |
| 61 | SD_DAT3 | `SD_DAT3` | microSD (CM5 Lite) |
| 62 | SD_CMD | `SD_CMD` | microSD (CM5 Lite) |
| 63 | SD_DAT0 | `SD_DAT0` | microSD (CM5 Lite) |
| 64 | SD_DAT5 | `*n.c.*` | microSD (CM5 Lite) |
| 65 | GND | `GND` | Ground |
| 66 | GND | `GND` | Ground |
| 67 | SD_DAT1 | `SD_DAT1` | microSD (CM5 Lite) |
| 68 | SD_DAT4 | `*n.c.*` | microSD (CM5 Lite) |
| 69 | SD_DAT2 | `SD_DAT2` | microSD (CM5 Lite) |
| 70 | SD_DAT7 | `*n.c.*` | microSD (CM5 Lite) |
| 71 | GND | `GND` | Ground |
| 72 | SD_DAT6 | `*n.c.*` | microSD (CM5 Lite) |
| 73 | SD_VDD_Override | `*n.c.*` | microSD (CM5 Lite) |
| 74 | GND | `GND` | Ground |
| 75 | SD_PWR_ON | `SD_PWR_ON` | microSD (CM5 Lite) |
| 76 | VBAT | `*n.c.*` | Power |
| 77 | +5v_(Input) | `+PS4_SENS` | Power |
| 78 | GPIO_VREF(1.8v/3.3v_Input) | `GPIO_VREF` | Power |
| 79 | +5v_(Input) | `+PS4_SENS` | Power |
| 80 | SCL0 | `LED_I2C-0.SCL` | I2C buses |
| 81 | +5v_(Input) | `+PS4_SENS` | Power |
| 82 | SDA0 | `LED_I2C-0.SDA` | I2C buses |
| 83 | +5v_(Input) | `+PS4_SENS` | Power |
| 84 | +3.3v_(Output) | `+3v3_CM5` | Power |
| 85 | +5v_(Input) | `+PS4_SENS` | Power |
| 86 | +3.3v_(Output) | `+3v3_CM5` | Power |
| 87 | +5v_(Input) | `+PS4_SENS` | Power |
| 88 | +1.8v_(Output) | `*n.c.*` | Power |
| 89 | WiFi_nDisable | `*n.c.*` | System |
| 90 | +1.8v_(Output) | `*n.c.*` | Power |
| 91 | BT_nDisable | `*n.c.*` | System |
| 92 | PWR_BUT | `PWR_BUT` | System |
| 93 | nRPIBOOT | `*n.c.*` | System |
| 94 | CC1 | `*n.c.*` | System |
| 95 | LED_nPWR | `nPWR_LED` | System |
| 96 | CC2 | `*n.c.*` | System |
| 97 | CAM_GPIO0 | `MCU_BOOT` | Scaffold dock (J2) |
| 98 | GND | `GND` | Ground |
| 99 | PMIC_ENABLE | `*n.c.*` | Power |
| 100 | CAM_GPIO1 | `+PS2_EN_IO35` | Scaffold dock (J2) |
## Appendix: J7 — CM5B (pins 101–200)
| Pin | CM5 function | Board net | Subsystem |
|----:|--------------|-----------|-----------|
| 101 | USB_OTG_ID | `USB_OTG` | USB 2.0 OTG |
| 102 | PCIe_nCLKREQ | `PCIE.nCLKREQ` | PCIe Gen2 x1 |
| 103 | USB2_N | `DEBUG_USB2_N` | USB 2.0 OTG |
| 104 | PCIE_nWAKE | `PCIE.nWAKE` | PCIe Gen2 x1 |
| 105 | USB2_P | `DEBUG_USB2_P` | USB 2.0 OTG |
| 106 | PCIE_PWR_EN | `PCIE.PWR_EN` | PCIe Gen2 x1 |
| 107 | GND | `GND` | Ground |
| 108 | GND | `GND` | Ground |
| 109 | PCIe_nRST | `PCIE_nRST` | PCIe Gen2 x1 |
| 110 | PCIe_CLK_P | `WIFI_PCIE.CLK_P` | PCIe Gen2 x1 |
| 111 | VBUS_EN | `3v3_PWR_EN` | PCIe Gen2 x1 |
| 112 | PCIe_CLK_N | `WIFI_PCIE.CLK_N` | PCIe Gen2 x1 |
| 113 | GND | `GND` | Ground |
| 114 | GND | `GND` | Ground |
| 115 | MIPI0_D0_N | `*n.c.*` | MIPI CSI/DSI (unused) |
| 116 | PCIe_RX_P | `WIFI_PCIE.RX_P` | PCIe Gen2 x1 |
| 117 | MIPI0_D0_P | `*n.c.*` | MIPI CSI/DSI (unused) |
| 118 | PCIe_RX_N | `WIFI_PCIE.RX_N` | PCIe Gen2 x1 |
| 119 | GND | `GND` | Ground |
| 120 | GND | `GND` | Ground |
| 121 | MIPI0_D1_N | `*n.c.*` | MIPI CSI/DSI (unused) |
| 122 | PCIe_TX_P | `WIFI_PCIE.TX_P` | PCIe Gen2 x1 |
| 123 | MIPI0_D1_P | `*n.c.*` | MIPI CSI/DSI (unused) |
| 124 | PCIe_TX_N | `WIFI_PCIE.TX_N` | PCIe Gen2 x1 |
| 125 | GND | `GND` | Ground |
| 126 | GND | `GND` | Ground |
| 127 | MIPI0_C_N | `*n.c.*` | MIPI CSI/DSI (unused) |
| 128 | USB3-0-RX_N | `USER_USB3-0.RX_N` | USB3-0 (USB-C J10) |
| 129 | MIPI0_C_P | `*n.c.*` | MIPI CSI/DSI (unused) |
| 130 | USB3-0-RX_P | `USER_USB3-0.RX_P` | USB3-0 (USB-C J10) |
| 131 | GND | `GND` | Ground |
| 132 | GND | `GND` | Ground |
| 133 | MIPI0_D2_N | `*n.c.*` | MIPI CSI/DSI (unused) |
| 134 | USB3-0-D_P | `USER_USB3-0.D_P` | USB3-0 (USB-C J10) |
| 135 | MIPI0_D2_P | `*n.c.*` | MIPI CSI/DSI (unused) |
| 136 | USB3-0-D_N | `USER_USB3-0.D_N` | USB3-0 (USB-C J10) |
| 137 | GND | `GND` | Ground |
| 138 | GND | `GND` | Ground |
| 139 | MIPI0_D3_N | `*n.c.*` | MIPI CSI/DSI (unused) |
| 140 | USB3-0-TX_N | `USER_USB3-0.TX_N` | USB3-0 (USB-C J10) |
| 141 | MIPI0_D3_P | `*n.c.*` | MIPI CSI/DSI (unused) |
| 142 | USB3-0-TX_P | `USER_USB3-0.TX_P` | USB3-0 (USB-C J10) |
| 143 | HDMI1_HOTPLUG | `*n.c.*` | HDMI (unused) |
| 144 | GND | `GND` | Ground |
| 145 | HDMI1_SDA | `*n.c.*` | HDMI (unused) |
| 146 | HDMI1_TX2_P | `*n.c.*` | HDMI (unused) |
| 147 | HDMI1_SCL | `*n.c.*` | HDMI (unused) |
| 148 | HDMI1_TX2_N | `*n.c.*` | HDMI (unused) |
| 149 | HDMI1_CEC | `*n.c.*` | HDMI (unused) |
| 150 | GND | `GND` | Ground |
| 151 | HDMI0_CEC | `*n.c.*` | HDMI (unused) |
| 152 | HDMI1_TX1_P | `*n.c.*` | HDMI (unused) |
| 153 | HDMI0_HOTPLUG | `*n.c.*` | HDMI (unused) |
| 154 | HDMI1_TX1_N | `*n.c.*` | HDMI (unused) |
| 155 | GND | `GND` | Ground |
| 156 | GND | `GND` | Ground |
| 157 | USB3-1-RX_N | `USER_USB3-1.RX_N` | USB3-1 (USB-A J9) |
| 158 | HDMI1_TX0_P | `*n.c.*` | HDMI (unused) |
| 159 | USB3-1-RX_P | `USER_USB3-1.RX_P` | USB3-1 (USB-A J9) |
| 160 | HDMI1_TX0_N | `*n.c.*` | HDMI (unused) |
| 161 | GND | `GND` | Ground |
| 162 | GND | `GND` | Ground |
| 163 | USB3-1-D_P | `MUX_USB3-1.D_P` | USB3-1 (USB-A J9) |
| 164 | HDMI1_CLK_P | `*n.c.*` | HDMI (unused) |
| 165 | USB3-1-D_N | `MUX_USB3-1.D_N` | USB3-1 (USB-A J9) |
| 166 | HDMI1_CLK_N | `*n.c.*` | HDMI (unused) |
| 167 | GND | `GND` | Ground |
| 168 | GND | `GND` | Ground |
| 169 | USB3-1-TX_N | `USER_USB3-1.TX_N` | USB3-1 (USB-A J9) |
| 170 | HDMI0_TX2_P | `*n.c.*` | HDMI (unused) |
| 171 | USB3-1-TX_P | `USER_USB3-1.TX_P` | USB3-1 (USB-A J9) |
| 172 | HDMI0_TX2_N | `*n.c.*` | HDMI (unused) |
| 173 | GND | `GND` | Ground |
| 174 | GND | `GND` | Ground |
| 175 | MIPI1_D0_N | `*n.c.*` | MIPI CSI/DSI (unused) |
| 176 | HDMI0_TX1_P | `*n.c.*` | HDMI (unused) |
| 177 | MIPI1_D0_P | `*n.c.*` | MIPI CSI/DSI (unused) |
| 178 | HDMI0_TX1_N | `*n.c.*` | HDMI (unused) |
| 179 | GND | `GND` | Ground |
| 180 | GND | `GND` | Ground |
| 181 | MIPI1_D1_N | `*n.c.*` | MIPI CSI/DSI (unused) |
| 182 | HDMI0_TX0_P | `*n.c.*` | HDMI (unused) |
| 183 | MIPI1_D1_P | `*n.c.*` | MIPI CSI/DSI (unused) |
| 184 | HDMI0_TX0_N | `*n.c.*` | HDMI (unused) |
| 185 | GND | `GND` | Ground |
| 186 | GND | `GND` | Ground |
| 187 | MIPI1_C_N | `*n.c.*` | MIPI CSI/DSI (unused) |
| 188 | HDMI0_CLK_P | `*n.c.*` | HDMI (unused) |
| 189 | MIPI1_C_P | `*n.c.*` | MIPI CSI/DSI (unused) |
| 190 | HDMI0_CLK_N | `*n.c.*` | HDMI (unused) |
| 191 | GND | `GND` | Ground |
| 192 | GND | `GND` | Ground |
| 193 | MIPI1_D2_N | `*n.c.*` | MIPI CSI/DSI (unused) |
| 194 | MIPI1_D3_N | `*n.c.*` | MIPI CSI/DSI (unused) |
| 195 | MIPI1_D2_P | `*n.c.*` | MIPI CSI/DSI (unused) |
| 196 | MIPI1_D3_P | `*n.c.*` | MIPI CSI/DSI (unused) |
| 197 | GND | `GND` | Ground |
| 198 | GND | `GND` | Ground |
| 199 | HDMI0_SDA | `*n.c.*` | HDMI (unused) |
| 200 | HDMI0_SCL | `*n.c.*` | HDMI (unused) |