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 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.