Automotive voltage supervisor with watchdog and manual reset

28th March 2019
Alex Lynn

The TPS382x-xx-Q1 family of supervisors from Texas Instruments provide circuit initialisation and timing supervision, primarily for DSP and processor-based systems. During power on, RESET asserts when the supply voltage VDD becomes greater than 1.1 V. Thereafter, the supply voltage supervisor monitors VDD and keeps RESET active low as long as VDD remains below the threshold voltage, VIT–.

An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, td, starts after VDDhas risen above the threshold voltage VIT–. When the supply voltage drops below the threshold voltage VIT–, the output becomes active (low) again.

No external components are required. All the devices of this family have a fixed-sense threshold voltage, VIT&ndash, set by an internal voltage divider. The TPS382x-xx-Q1 family also offers watchdog time out options of 200ms (TPS3820-xx-Q1) and 1.6 s (TPS3823/4/8-xx-Q1).

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