TIC12400-Q1 Datasheet, PDF (14/127 Pages) Texas Instruments – 24-Input Multiple Switch Detection Interface (MSDI) With Integrated ADC and Adjustable Wetting Current for Automotive Systems

TIC12400-Q1
SCPS260 – AUGUST 2017
8 Detailed Description
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8.1 Overview
The TIC12400-Q1 is an advanced 24-input Multiple Switch Detection Interface (MSDI) device designed to detect
external mechanical switch status in a 12-V automotive system by acting as an interface between the switches
and the low-voltage microcontroller. The TIC12400-Q1 is an integrated solution that replaces many discrete
components and provides integrated protection, input serialization, and system wake-up capability.
The device monitors 14 switches to GND and 10 additional switches that can be programmed to be connected to
either GND or V_BAT. It features SPI interface to report individual switch status and provides programmability to
control the device operation. The TIC12400-Q1 features a 10-bit ADC which is useful to monitor analog inputs
such as resistor coded switches that have multiple switching positions. To monitor only digital switches, an
integrated comparator can be used instead to monitor the input status. The device has 2 modes of operation:
continuous mode and polling mode. The polling mode is a low-power mode that can be activated to reduce
current drawn in the system by only turning on the wetting current for a small duty cycle to detect switch status
changes. An interrupt is generated upon detection of switch status change and it can be used to wake up the
microcontroller to bring the entire system back to operation.
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