Multi-switch detection interface devices slash power consumption

October 10, 2017 // By Julien Happich
Texas Instruments has introduced two multi-switch detection interface (MSDI) devices that consume up to 98 percent 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. The devices natively monitor the inputs and decode the resistor path of as many as 54 switches in one device, offloading the signal decoding task 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. 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.

Eliminating up to 120 discrete components, the TIC12400-Q1 features an input-sharing and matrix mode that helps monitor 54 switches and sensors, reducing complexity in a 60 percent smaller footprint. 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.

Texas Instruments –