SNAU309 October 2025 LMK3H2108
The General Purpose Input (GPI) and General Purpose Input and Output (GPIO) pins on the LMK3H2108 provide options for selecting different device modes, output enable or disable control, Loss of Signal (LOS) detection, and I2C device address selection. Table 2-3 describes the possible behaviors of each GPI and GPIO pin.
| PIN NAME | GLOBAL OE FUNCTION | OE_GROUP FUNCTION | INPUT CLOCK FUNCTION | STATUS OUTPUT FUNCTION | I2C ADDRESS FUNCTION | OTP PAGE SELECTION | POWERDOWN FUNCTION |
|---|---|---|---|---|---|---|---|
| GPI_0 | Yes | Yes | IN0_P | N/A | Yes | No | N/A |
| GPI_1 | Yes | Yes | IN0_N | N/A | Yes | No | N/A |
| GPI_2 | Yes | Yes | IN1_P | N/A | Yes | No | Yes |
| GPI_3 | Yes | Yes | IN1_N | N/A | Yes | No | Yes |
| GPI_4 | Yes | Yes | IN2_P | N/A | Yes | No | Yes |
| GPI_5 | Yes | Yes | IN2_N | N/A | Yes | No | Yes |
| GPIO_0 | Yes | Yes | No | Yes | Yes | Yes | Yes |
| GPIO_1 | Yes | Yes | No | Yes | Yes | Yes | Yes |
| GPIO_2 | Yes | Yes | No | Yes | Yes | Yes | Yes |
| GPIO_3 | Yes | Yes | No | Yes | Yes | No | Yes |
| GPIO_4 | Yes | Yes | No | Yes | Yes | No | Yes |
All GPI and GPIO pins have weak internal pullup and pulldown resistors that can be configured in TICS Pro. The voltage that is seen by each GPIO pin can be controlled by either jumpers or the USB2ANY interface. The voltage on the GPI pins can only be controlled through jumpers.
| PIN NAME | REFERENCE DESIGNATOR | POSITION | DESCRIPTION |
|---|---|---|---|
| GPI_0 (1) | JP9 | 1-2 |
1-2: Pulled to VDDD 2-3: Pulled to GND |
| GPI_1 (2) | JP15 | 1-2 |
1-2: Pulled to VDDD 2-3: Pulled to GND |
| GPI_2 (3) | JP18 | 1-2 |
1-2: Pulled to VDDD 2-3: Pulled to GND |
| GPI_3 (4) | JP19 | 1-2 |
1-2: Pulled to VDDD 2-3: Pulled to GND |
| GPI_4 (5) | JP21 | 1-2 |
1-2: Pulled to VDDD 2-3: Pulled to GND |
| GPI_5 (6) | JP22 | 1-2 |
1-2: Pulled to VDDD 2-3: Pulled to GND |
| GPIO_0 | JP3 + JT3 | 2-JT3 |
1-2: Pulled to VDDD 2-3: Pulled to GND 2-JT3: Controlled by TICS Pro 2 |
| GPIO_1 | JP16 + JT5 | 2-JT5 |
1-2: Pulled to VDDD 2-3: Pulled to GND 2-JT6: Controlled by TICS Pro 2 |
| GPIO_2 | JP2 + JT2 | 2-JT2 |
1-2: Pulled to VDDD 2-3: Pulled to GND 2-JT2: Controlled by TICS Pro 2 |
| GPIO_3 | JP4 + JT4 | 2-JT4 |
1-2: Pulled to VDDD 2-3: Pulled to GND 2-JT4: Controlled by TICS Pro 2 |
| GPIO_4 | JP1 + JT1 | 2-JT1 |
1-2: Pulled to VDDD 2-3: Pulled to GND 2-JT1: Controlled by TICS Pro 2 |
| PWRGD/PWRDN | JP26 + JT6 | 2-JT6 |
1-2: Pulled to VDDD 2-3: Pulled to GND 2-JT6: Controlled by TICS Pro 2 |