TIC12400 24-Input Sensor Monitors

TIC12400 24-Input Sensor Monitors

Texas Instruments' TIC12400 are advanced MSDI devices designed to detect external switch statuses. The TIC12400 support 24 direct inputs, with ten inputs configurable to monitor digital I/O switches. Six wetting current settings can be programmed for each input to support different application scenarios. The TIC12400 feature an integrated 10-bit ADC to monitor multi-position analog switches and a comparator to monitor digital switches independently of the MCU. The devices support wake-up operation on all switch inputs to eliminate the need to keep the MCU active continuously, reducing power consumption of the system. The TIC12400 support two modes of operations: continuous and polling mode. In continuous mode, wetting current is supplied continuously. In polling mode, wetting current is turned on periodically to sample the input status based on a programmable timer, reducing the system power consumption significantly. The TIC12400 also offer various fault detection and diagnostic features for improved system robustness.

Features
  • Operates with supply voltage (VS) from 6.5 V to 35 V with overvoltage and undervoltage warning
  • Monitors up 24 direct switch inputs with 10 inputs configurable to monitor switches connected to either ground or supply
  • Switch input withstands 40 V and reverse supply condition down to -24 V
  • Six configurable wetting current settings:
    0 mA, 1 mA, 2 mA, 5 mA, 10 mA, and 15 mA
  • Integrated 10-bit ADC for multi-position analog switch monitoring
  • Integrated comparator with four programmable thresholds for input monitoring
  • Interrupt generation to support wake-up operation on all inputs

Applications

  • Signal measurement
  • PLC, DCS, and PAC
  • Instrumentation
  • Ultra-low operating current in polling mode:
    • 68 µA typical (tPOLL = 64 ms, tPOLL_ACT = 128 µs, all 24 inputs active, comparator mode, all switches open)
  • Interfaces directly to MCU using 3.3 V/5 V serial peripheral interface (SPI) protocol
  • Integrated supply and temperature sensing
  • ±8 kV contact discharge ESD protection on input pins per IEC 61000-4-2 with appropriate external components
  • 38-pin TSSOP package
Manufacturer