| Pin | GP | Function | Boot State | In | Out | PWM | Usage | GTEM Net | IPEM Net | IPEC Net | Comments |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 33 | 21 | SDA | D | X | N/A | Data | SDA | SDA | SDA | I2C. Pulled High via 10K | |
| 36 | 22 | SDA | D | X | N/A | Data | SCL | SCL | SCL | I2C. Pulled High via 10K | |
| 14 | 12 | Internal Pull-Down | Low | IO | Yes | Issues | I/O | GP12 GPIO | GP12 GPIO | GP12 GPIO | Strapping Pin. Boot fail if pulled HIGH |
| 16 | 13 | IO | Yes | Yes | I/O | ATM_IRQ | ATM_IRQ0 | ATM_IRQ0 | |||
| 13 | 14 | IO | Yes | Issues | I/O | GP14 GPIO | ATM_IRQ1 | ATM_IRQ1 | Outputs PWM at boot | ||
| 23 | 15 | Internal Pull-Up | High | LED | X | Issues | Out | LED BLUE | LED BLUE | LED BLUE | Strapping Pin. Outputs PWM at boot |
| 31 | 19 | MISO | IO | Yes | Yes | Data | MISO | MISO | MISO | V-SPI | |
| 37 | 23 | MOSI | IO | Yes | Yes | Data | MOSI | MOSI | MOSI | V-SPI | |
| 30 | 18 | SCK | IO | Yes | Yes | Data | SCK | SCK | SCK | V-SPI | |
| 29 | 5 | CS | High | IO | Yes | Issues | Data | CS | CS | CS | V-SPI. Strapping Pin. Outputs PWM at boot |
| 35 | 1 | TX0 | D | N/A | Data | USB_TXD | USB_TXD | USB_TXD | Debug output at boot | ||
| 34 | 3 | RX0 | High | D/I | N/A | D-IN | USB_RXD | USB_RXD | USB_RXD | HIGH at boot | |
| 28 | 17 | TX2 | D | Yes | Data | TTL_TXD | USR_GP17_TX | USR_GP17_TX | |||
| 27 | 16 | RX2 | D | Yes | Data | TTL_RXD | USR_GP16_RX | USR_GP16_RX | |||
| 3 | Enable | High | P | N/A | PRG | Enable | Enable | Enable | |||
| 25 | 0 | GP0 | High | P | N/A | PRG | GP0 | GP0 | GP0 | Strapping Pin. Outputs PWM at boot | |
| 24 | 2 | Internal Pull-Down | LED | X | N/A | Out | LED RED | LED RED | LED RED | Strapping Pin. Connected to on-board ESP LED | |
| 26 | 4 | ADC 2 CH0 | LED | X | Yes | Out | LED GREEN | LED GREEN | LED GREEN | Strapping Pin. Ignore 0 - 0.1V and 3.2 - 3.3V | |
| 12 | 27 | ADC 2 CH7 | IO/AI | Yes | Yes | I/O | ATM_WO | ATM_CF1 | ATM_CF1 | Ignore 0 - 0.1V and 3.2 - 3.3V | |
| 8 | 32 | ADC 1 CH4 | IO/AI | Yes | Yes | I/O | ATM_ZX | ATM_CF2 | ATM_CF2 | Ignore 0 - 0.1V and 3.2 - 3.3V | |
| 9 | 33 | ADC 1 CH5 | IO/AI | Yes | Yes | I/O | OPTO | ATM_CF3 | ATM_CF3 | Ignore 0 - 0.1V and 3.2 - 3.3V | |
| 6 | 34 | ADC 1 CH6. NoPUD | I/AI | No | I | ATM_CF1 | ATM_CF4 | ATM_CF4 | input only. Ignore 0 - 0.1V and 3.2 - 3.3V | ||
| 7 | 35 | ADC 1 CH7. NoPUD | I/AI | No | I | ATM_CF2 | CT4 | ATM_WO | input only. Ignore 0 - 0.1V and 3.2 - 3.3V | ||
| 4 | 36 | VP / ADC 1 CH0. NoPUD | I | No | A-IN | PCA DC Supply DCV_IN | PCA DC Supply DCV_IN | PCA DC Supply DCV_IN | input only | ||
| 5 | 39 | VN / ADC 1 CH3. NoPUD | I | No | A-IN | NTC-10K | NTC-10K | GP39 I/O Header | input only | ||
| 10 | 25 | DAC1 | IO/AO | Yes | Yes | I/O | User_Jumper | ATM_WO | PWM_/LDAC | With pullup and decoupling cap | |
| 11 | 26 | DAC2 | IO/AO | Yes | Yes | I/O | User_Button | User_Button | User_Button | With pullup and decoupling cap |