The TIC12400-Q1 is an advanced Multiple SwitchDetection Interface (MSDI) designed to detectexternal switch status in a 12-V automotive system.The TIC12400-Q1 features an integrated 10-bit ADCto monitor multi-position analog switches and acomparator to monitor digital switches independentlyof the MCU. Detection thresholds can beprogrammed for the ADC and the comparator tosupport various switch topologies and system nonidealities.
The device monitors 24 direct switch inputs,with 10 inputs configurable to monitor switchesconnected to either ground or battery. 6 uniquewetting current settings can be programmed for eachinput to support different application scenarios. Thedevice supports wake-up operation on all switchinputs to eliminate the need to keep the MCU activecontinuously, thus reducing power consumption of thesystem. The TIC12400-Q1 also offers integrated faultdetection, ESD protection, and diagnostic functionsfor improved system robustness. The TIC12400-Q1supports 2 modes of operations: continuous and polling mode. In continuous mode, wetting current issupplied continuously. In polling mode, wettingcurrent is turned on periodically to sample the inputstatus based on a programmable timer, thus thesystem power consumption is significantly reduced.