Product details


Number of inputs 24 Operating voltage (Min) (V) 6.5 Operating voltage (Max) (V) 24 I/O voltage (Min) (V) -24 I/O voltage (Max) (V) 40 IO current (mA) 1, 2, 5, 10, 15 Operating temperature range (C) -40 to 105 Features Integrated 10-bit ADC, Polling mode, Configurable wetting current, Overvoltage warning, Undervoltage warning, SPI, Interrupt wake-up operation, Withstands load dump condition and reverse polarity condition Interface SPI Diagnostics Wetting Current Diagnostic, ADC Self-Diagnostic Logic voltage (Min) (V) 3 Logic voltage (Max) (V) 5.5 open-in-new Find other Multi-switch detection interface (MSDI) ICs

Package | Pins | Size

HTSSOP (DCP) 38 43 mm² 9.7 x 4.4 open-in-new Find other Multi-switch detection interface (MSDI) ICs


  • Operates with Supply Voltage (VS) from 6.5 V to 35 V with Over-voltage and Under-voltage 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
  • 6 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 4 Programmable Threshold for Input Monitoring
  • 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
  • Interrupt Generation to Support Wake-Up Operation on All Inputs
  • 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

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open-in-new Find other Multi-switch detection interface (MSDI) ICs


The TIC12400 is an advanced Multiple Switch Detection Interface (MSDI) device designed to detect external switch statuses. The TIC12400 supports 24 direct inputs, with 10 inputs configurable to monitor digital I/O switches. 6 wetting current settings can be programmed for each input to support different application scenarios. The TIC12400 features an integrated 10-bit ADC to monitor multi-position analog switches and a comparator to monitor digital switches independently of the MCU. The device supports wake-up operation on all switch inputs to eliminate the need to keep the MCU active continuously, thus reducing power consumption of the system. The TIC12400 supports 2 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, thus the system power consumption is significantly reduced. The TIC12400 also offers various fault detection and diagnostic features for improved system robustness.

open-in-new Find other Multi-switch detection interface (MSDI) ICs

Technical documentation

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Type Title Date
* Datasheet TIC12400 24-Input Multiple Switch Detection Interface (MSDI) Device With Integrated ADC and Adjustable Wetting Current datasheet Sep. 22, 2017
User guides TIC12400 EVM User's Guide Oct. 03, 2017
Technical articles Small doesn’t mean you compromise performance when implementing signal isolation May 25, 2017
Technical articles Upgrading the standard: a better way to drive peripherals Jun. 20, 2014
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Technical articles Going for distance or going for speed on the RS-485 bus? Mar. 05, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
The TIC12400EVM-KIT is a flexible two-board evaluation platform that lets you evaluate the expansive feature sets of the TIC12400-Q1 device. The TIC12400-Q1 device is a 24-channel switch and contact monitoring solution that incorporates a power-saving polling architecture, configurable (...)
  • EVM connects to a computer using USB cable and lets you program configurations and read status information
  • EVM incorporates temperature and current measurements by using the GUI and has many configurable hardware options
  • Kit features the ability to do digital switches and resistor coded switches or (...)

Design tools & simulation

SCPM044.IBS (255 KB) - IBIS Model
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide

CAD/CAE symbols

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HTSSOP (DCP) 38 View options

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Automotive Multi-Switch Detection Interface (MSDI) reference design

This video demonstrates how the automotive MSDI reference design can save space and power in body control modules, top column modules, and faceplate modules.

Posted: 09-Jan-2017
Duration: 03:32

Get the design files

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