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TI公司的TIC12400-Q1是用在12V汽车系统的24路输入多路开关检测接口(MSDI)器件,集成了10位ADC来检测模拟开关多种位置,集成的比较器用来检测MCU的数字开关,检测阈值可编程,以支持各种开关拓扑和系统非理想性,工作温度C40℃ 到125℃,支持连续模式和轮询模式,主要用在12V汽车系统中的车体控制和网关,汽车照明,加热和冷却,电动座椅和镜子.本文介绍了TIC12400-Q1主要特性,框图和应用电路,以及评估模块TIC12400 EVM特性,框图,主板和开关板电路图,材料清单. 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. TIC12400-Q1主要特性: TIC12400-Q1应用: • Body Control Module and Gateway 评估模块TIC12400 EVM The TIC12400 is a multiple switch detection interface that is designed to detect the opening and closing ofup to 24 switch contacts. 10 out of the 24 inputs are configurable to detect switch states that are eitherbattery connected switches (BCS) or ground connected switches (GCS), which means it can either sink orsource current from the channel. The remaining 14 channels are design to support ground connectedswitches only (source current). The wetting current can be preprogrammed to six available values, whichaccommodates for different application scenarios. Communication to and from the device is done using a24-bit SPI protocol. The TIC124000 and TIC12400-Q1 provide the same functionality and the TIC12400 Evaluation Module isused for both devices.
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