TIC12400-Q1

• Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
  • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature
  • Device HBM ESD Classification Level H2
  • Device CDM ESD Classification Level C4B
• Designed to Support 12-V Automotive Systems with Over-voltage and Under-voltage Warning
• Monitors up to 24 Direct Switch Inputs with 10 Inputs Configurable to Monitor Switches Connected to Either Ground or Battery
• Switch Input Withstands up to 40 V (Load Dump Condition) and down to –24 V (Reverse Polarity Condition)
• 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 Thresholds for Digital Switch Monitoring
• 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
• Interrupt Generation to Support Wake-Up Operation on All Inputs
• Integrated Battery and Temperature Sensing
• ±8 kV Contact Discharge ESD Protection on Input Pins per ISO-10605 With Appropriate External Components
• 38-Pin TSSOP Package

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The TIC12400-Q1 is an advanced Multiple Switch Detection Interface (MSDI) designed to detect external switch status in a 12-V automotive system. The TIC12400-Q1 features an integrated 10-bit ADC to monitor multi-position analog switches and a comparator to monitor digital switches independently of the MCU. Detection thresholds can be programmed for the ADC and the comparator to support various switch topologies and system non-idealities. The device monitors 24 direct switch inputs, with 10 inputs configurable to monitor switches connected to either ground or battery. 6 unique wetting current settings can be programmed for each input to support different application scenarios. 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-Q1 also offers integrated fault detection, ESD protection, and diagnostic functions for improved system robustness. The TIC12400-Q1 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.