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Board overview
Teensy LC
PJRC · Teensy
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Showing 28 of 28 pins
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
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Mapped source · PJRC Teensy LC product pageOfficial- PJRC Teensy LC (MKL26Z64); labels from the official PJRC pinout reference card.
- GPIO is 3.3 V only and is not 5 V tolerant.
- Pin 26 (A12) is the only true DAC. Default Wire I2C is pins 18/19 (SDA0/SCL0); default SPI is 11/12/13/10.
- Left header positions 1-14 (GND at top, USB end), right header positions 15-28 (Vin at top).
All 28 pins
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | Ground | GND | ||
| 2 | UART | UART1 | Serial1 RX | |
| 3 | UART | UART1 | Serial1 TX | |
| 4 | GPIO | |||
| 5 | PWM | UART1 | ||
| 6 | PWM | UART1 | ||
| 7 | GPIO | |||
| 8 | PWM | |||
| 9 | UART | UART3 | Serial3 RX; MOSI0 | |
| 10 | UART | UART3 | Serial3 TX; MISO0 | |
| 11 | UART | UART2 | Serial2 RX | |
| 12 | UART | UART2 | Serial2 TX; CS0 | |
| 13 | SPI | SPI0 | ||
| 14 | SPI | SPI0 | ||
| 15 | Power | VIN | 3.7-5.5 V (USB 5 V) | |
| 16 | Ground | GND | ||
| 17 | Power | 3V3 | 100 mA max out | |
| 18 | ADC | SDA1; PWM | ||
| 19 | ADC | SCL1; PWM | ||
| 20 | ADC | MOSI1 | ||
| 21 | ADC | SCK1; PWM | ||
| 22 | I2C | I2C | SCL0 | |
| 23 | I2C | I2C | SDA0 | |
| 24 | ADC | SDA0; PWM | ||
| 25 | ADC | SCL0; PWM | ||
| 26 | ADC | |||
| 27 | ADC | SCK0 | ||
| 28 | SPI | SPI | SCK0; onboard LED |