FlexCase

Digital Input Guide

Features	Specification
Maximum Input Voltage	36 V
Input HIGH level DC voltage threshold	2.31 – 3.6 V
Input LOW level DC voltage threshold	0.3 – 0.99 V
Default pull	Pull down
Maximum Input Leakage Current	120 nA
PWM Signal Frequency	50 MHz
Signal Conditioning and Protection	Voltage Limiting, Voltage Filtering, Current Limiting

By default all the digital inputs are pulled LOW. The Digital Input Pull-Up Enable pin (DI_Hi_Pull_EN) is used to configure the pull on the digital inputs.
- For Example, in FCE 2.1, Setting PTE14 HIGH will pull up the digital inputs 1-6. Refer datasheet for more Info.
Each digital input is equipped with signal conditioning and protection features, including Voltage Limiting, Voltage Filtering, and Current Limiting, to safeguard the MCU.
Make sure the input voltage is between the threshold range mentioned above for HIGH and LOW values.

Features	Specification
Maximum Input Voltage	36 V
Input HIGH level DC voltage threshold	2.31 – 3.6 V
Input LOW level DC voltage threshold	0.3 – 0.99 V
Default pull	Pull up (FCS 1.1 / FCB 1.1 and Older) , Pull down (FCS 1.2 / FCB 1.2 and Newer)
Maximum Input Leakage Current	120 nA
PWM Signal Frequency	40 MHz
Signal Conditioning and Protection	Voltage Limiting, Voltage Filtering, Current Limiting

Pull up / Pull Down Configuration for different device Versions:
- FCS1.1, FCB1.1, and Older Versions:
  - By default all the digital inputs are pulled HIGH.
  - When nothing is connected the input will read high and can be used for open collector circuits.
- FCS1.2, FCB1.2, and Newer Versions:
  - By default all the digital inputs are pulled LOW. The Digital Input Pull-Up Enable pin (DI_Hi_Pull_EN) is used to configure the pull on the digital inputs.
    - For Example, in FCS 1.3, Setting PTC8 HIGH will pull up the digital inputs 1-8. Refer datasheet for more Info.
  - When nothing is connected the input will read low
Use Cases for Digital Inputs:
- Digital inputs can be used for quadrature encoders or as regular digital inputs.