SNAU309 October   2025

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 EVM Quick Start
      1. 2.1.1 Hardware Setup
      2. 2.1.2 Software Setup
    2. 2.2 EVM Configuration
      1. 2.2.1 Device Operational Modes
      2. 2.2.2 Power Supply
      3. 2.2.3 Logic Inputs and Outputs
      4. 2.2.4 Configuring the Clock Outputs
      5. 2.2.5 Using the USB Interface Connection
  8. 3Software
    1. 3.1 Software Installation
    2. 3.2 Software Description
      1. 3.2.1 User Controls Page
      2. 3.2.2 Raw Registers Page
      3. 3.2.3 Global Settings Page
      4. 3.2.4 EFUSE Pages Page
      5. 3.2.5 GPIO Page
      6. 3.2.6 FODs Page
      7. 3.2.7 Inputs Page
      8. 3.2.8 OUT0 Page
      9. 3.2.9 OUT1 & OUT2 Page
  9. 4Implementation Results
    1. 4.1 Evaluation Setup
    2. 4.2 Performance Data and Results
  10. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layouts
    3. 5.3 Bill of Materials (BOM)
  11. 6Additional Information
    1. 6.1 Trademarks
  12. 7Related Documentation
    1. 7.1 Supplemental Content

2.2.3 Logic Inputs and Outputs

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.

Table 2-3 GPI/GPIO Behaviors
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
(1) The GPI pins are configured as clock input pins by default. For using GPI_0, move the R181 resistor to the R129 footprint.
(2) The GPI pins are configured as clock input pins by default. For using GPI_1, move the R184 resistor to the R139 footprint.
(3) The GPI pins are configured as clock input pins by default. For using GPI_2, move the R195 resistor to the R155 footprint.
(4) The GPI pins are configured as clock input pins by default. For using GPI_3, move the R197 resistor to the R167 footprint.
(5) The GPI pins are configured as clock input pins by default. For using GPI_4, move the R199 resistor to the R177 footprint.
(6) The GPI pins are configured as clock input pins by default. For using GPI_5, move the R201 resistor to the R178 footprint.