Integrated switch and sensor monitors protect in automotive and industrial devices

Multi-switch detection interface devices from Texas Instruments save power and save space in industrial and automotive applications.

The two multi-switch detection interface (MSDI) devices consume up to 98 per cent less system power than conventional discrete solutions, claims the Texas Instruments. The TIC12400 and TIC12400-Q1 are believed to be the first switch and sensor monitors that directly interface with resistor-coded switches.  

The TIC12400 and TIC12400-Q1 can alleviate the challenge faced by automotive manufacturers in particular to save power and space, by natively monitoring the inputs and decoding the resistor path of as many as 54 switches in one device. In this way, the signal decoding task is offloaded from the processor. Additionally, 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, adds Texas Instruments.

Using the TIC12400-Q1, designers can reduce system power consumption from mA to microA in applications that need high efficiency, says the company. On-device monitoring allows the microcontroller to go into a low-power sleep mode. This feature is particularly useful for applications like automotive start/stop or when a car is parked for extended periods of time.

It also reduces complexity, eliminating up to 120 discrete components. The TIC12400-Q1 features an input-sharing and matrix mode that helps monitor 54 switches and sensors. The 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 ESD protection and self-diagnostic features reduce external protection components.

The TIC12400 and TIC12400-Q1 meet International Organization for Standardization (ISO) 10605 ±8-kV ESD protection requirements, preventing potential fault events from damaging internal circuitry. The configurable devices independently monitor and protect 24 inputs, providing more headroom for the host microcontroller to perform other functions.

The TIC12400 evaluation module (TIC12400EVM-KIT) is available for designers to evaluate the device’s capabilities.

The devices are available now in volume in thin shrink small outline packages (TSSOPs) measuring 9.7 x 4.4mm.


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