TIC12400 24-Input Sensor Monitors

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            TIC12400 24-Input Sensor Monitors
                    Texas Instruments' TIC12400 are 24-input multiple switch detection interface (MSDI) devices with integrated ADC and adjustable wetting current
    

Image of Texas Instruments' 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 (V_S) 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 (t_POLL = 64 ms, t_{POLL_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