SLLU344 February   2022 TIOL112 , TIOL1123 , TIOL1125 , TIOS102 , TIOS1023 , TIOS1025

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Description
  3. 2EVM Setup and Features Explained
    1. 2.1 Evaluation Equipment
    2. 2.2 Power Overview
    3. 2.3 Current Limit Overview
    4. 2.4 Fault Reporting (NFAULT)
    5. 2.5 Transient Protection and Custom Loads
    6. 2.6 IO-Link Communication (TIOL112x)
    7. 2.7 Digital Sensor Output Driver Control (TIOS102x and TIOS112x)
    8. 2.8 EVM Jumper Settings
  4. 3Schematic and Bill of Materials
    1. 3.1 Schematic
    2. 3.2 Bill of Materials
  5. 4Revision History

2.3 Current Limit Overview

The output current limit for the TIOL11xx and TIOS11xx devices can be configured through the ILIM_ADJ pins. There is an external resistor on the ILIM_ADJ pin with a maximum settable current limit of 350 mA.

Connecting the ILIM_ADJ pin to GND increases the current limit to 500 mA for both the TIOL112x and TIOS102x devices. This also allows the TIOL112x devices to enter a master mode, and allows it to source or sink a minimum of 500 mA to generate a wake-up request. Also, while in this mode, the device enables a small current sink of 5 mA (minimum) as required in the IO-Link standard specification, which calls for a minimum limit of 500 mA, it disables the current fault indication, as well as the Output Disable and Auto Recovery features of the device.

Leaving the ILIM_ADJ pin floating sets the output current limit for the TIOL112x and TIOS102x devices to 300 mA, but disables the Output Disable and Auto Recovery if an over-current condition longer than the current fault blanking time (tsc) occurs. The NFAULT pin will still report this over-current fault condition, but the output will not be disabled and is useful when driving certain capacitive loads that may require a charging time greater than tsc.

The EVM allows both the TIOL112x and TIOS102x ILIM_ADJ pins to be fully and independently configured through headers J4 (TIOL112x) and J8 (TIOS102x). Placing a shunt on pins 3 and 4 of these headers connects the device’s ILIM_ADJ pin with a fixed resistor, that is by default 25.5 kΩ. Placing a shunt between pins 5 and 6 connects a variable resistance through the 100 kΩ potentiometers that can be adjusted to the desired current limit for each device. Place a shunt between pins 1 and 2 to short the ILIM_ADJ pins to GND. Remove the shunt from the headers completely to allow the ILIM_ADJ pins to float.