Part of the week: TI TPL5111

Stumbled on this interesting part from TI recently

TPL5111

TPL5111 solves a typical problem in low power wireless systems- things need to be off most of the time, and wake up periodically to transmit. The usual solution is to pick a microcontroller that can stay asleep in low power mode at a few uA, then wake up on RTC timer. That works most of the time, but sometimes even that is too much standby power. Imagine a system for example that has to work from a small coin cell for 5-10 years. Each uA of sleep current is an 8mAh a year. So in 10 years, 80mAh is wasted. (A typical CR2032 battery for example starts with only 220mAh)

TI’s solution is a timer that can stay on while drawing 35nA. Once set with a single resistor for a particular time interval, between 100ms  and 2 hours, it turns power on to the system, waits to hear back from the micro via “done” pin and then turns things back off. TI even provides a handy table of resistor values vs timer settings. Not bad for $0.45@1k, plus there are many other scenarios such an almost zero power scheduler may be handy.  

Datasheet:

 

4 thoughts on “Part of the week: TI TPL5111

  1. Pingback: Ultra, Ultra Low-Power (35nA!) Programmable Timer, the TI TPL5111 @TXInstruments « Adafruit Industries – Makers, hackers, artists, designers and engineers!

  2. Pingback: Ultra Low-Power (35nA!) Programmable Timer using TI TPL5111 - Electronics-Lab

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