TIC12400 24-input sensor monitor with integrated 1:1 (SPST), 10-channel ADC & SPI | TI.com

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24-input sensor monitor with integrated 1:1 (SPST), 10-channel ADC & SPI



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.


  • 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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Part number Order Number of inputs Operating voltage (Min) (V) Operating voltage (Max) (V) I/O voltage (Min) (V) I/O voltage (Max) (V) IO current (mA) Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Interface Features Diagnostics Logic voltage (Min) (V) Logic voltage (Max) (V)
TIC12400 Order now 24     6.5     24     -24     40     1
-40 to 105     HTSSOP | 38     38HTSSOP: 43 mm2: 4.4 x 9.7 (HTSSOP | 38)     SPI     Integrated 10-bit ADC
Polling mode
Configurable wetting current
Overvoltage warning
Undervoltage warning
Interrupt wake-up operation
Withstands load dump condition and reverse polarity condition    
Wetting Current Diagnostic
ADC Self-Diagnostic    
3     5.5    
SN65HVS882 Order now 8     10     34     -0.3     36     0.2 to 5.2     -40 to 125     HTSSOP | 28     28HTSSOP: 43 mm2: 4.4 x 9.7 (HTSSOP | 28)     SPI     Over Temperature     Overtemperature diagnostics     2     0.8