Low power sensor IC decodes up to 54 resistor-coded switches

October 11, 2017 //By Graham Prophet
Low power sensor IC decodes up to 54 resistor-coded switches
Texas Instruments says that its fully integrated switch and sensor monitors can ‘slash system power usage’, cutting board space and increasing system protection in automotive and industrial applications.

Two multi-switch detection interface (MSDI) devices consume up to 98% less system power than conventional discrete solutions. The TIC12400 and TIC12400-Q1 are the first switch and sensor monitors that directly interface with resistor-coded switches. Designers of automotive body control modules can, TI says, decrease system cost and vehicle weight by using this device to create a smarter, more centralized architecture, reducing the number and overall weight of wires going into the harness. Explore how the TIC12400-Q1 can decode high-voltage switch inputs in an Automotive Multi-Switch Interface Reference Design .


Manufacturers, especially automotive manufacturers, are challenged to integrate more functionality while saving power and space. The TIC12400 and TIC12400-Q1 can alleviate this challenge by natively monitoring the inputs and decoding the resistor path of as many as 54 switches in one device, offloading the signal decoding task from the processor. By directly monitoring and providing built-in diagnostics for 24 channel inputs, the devices’ polling sequence architecture reduces the system microcontroller active time, significantly cutting system power usage for applications including automotive body electronics and factory and building automation equipment.


Designers can reduce system power consumption from milliamps to microamps in applications that need high efficiency. On-device monitoring allows the microcontroller to go into a low-power sleep mode and use less power when idle.


Offering reduced complexity in a 60% smaller footprint, the device can eliminate up to 120 discrete components, TI asserts. The TIC12400-Q1 features an input-sharing and matrix mode that helps monitor 54 switches and sensors. The highly integrated device also includes adjustable wetting currents, timing controls, thresholds and built-in redundant circuitry for protection, which increases system-level reliability by reducing potential points of failure.


Integrated electrostatic discharge (ESD) protection and self-diagnostic features reduce external protection components; the devices meet ISO 10605 ±8-kV ESD protection requirements. The fully configurable devices independently monitor and protect 24 inputs, providing more headroom for the host microcontroller to perform other functions.

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