TPL5110 Breakout

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DIP breakout board for TPL5110 Nano-power system timer and watchdog - TPL5110 Datasheet

  • Uses just 38nA when your load is put to sleep (load is disconnected from power).
  • operates from 1.8V to 5.5V
  • can drive high power loads (several amps)
  • ultra low 1mV voltage drop between VIN and VOUT (load pin) - may increase to a few mV for high loads
  • 0.1" spaced pins for easy breadboard prototyping
  • castellated side holes allow placing this directly on your own PCB as any other SMD component
  • convenient POWER-ON and DONE buttons, which are also broken out to the side pins for use in your own circuit

Modes of operation

  • Upper header can be used to switch between two modes (see datasheet for detailed description of these timer modes):
    • Timer (default) - the timer cycles power ON/OFF at precise intervals (set by the delay)
      • Leave the upper header as-is
    • OneShot - powers the load/MCU one time until either:
      • a DONE signal is received from the load to shutdown sooner than the delay
      • delay expires (without DELAY signal)
      • an ON! signal from or button press from the user restores power and cycle repeats
      • useful for setting a system power-off delay (ex. a 1A load needs to be shutdown after precisely 1 hour)
      • Cut the jumper on the bottom and either solder jumper the OneShot side or use the provided header and jumper for easy switching during development
    • Watchdog - rather than a RESET, the timer can be used to cycle power if a DONE signal is not received within the set delay (if the MCU/load fails to send the DONE signal within the expected time frame). This is sometimes more desirable than a RESET since it completely shuts power to the load and then restores it within 50ms, hence the MCU can re-initialize all peripherals in case of a lock/freeze condition. This mode obsoletes the need for a dedicated TPL5010 watchdog chip (which can only RESET the load, not cut power)

Delay options

  • delay can be set using a resistor value between 0.5-170KOhm, or a Trim Potentiometer
  • Used with our 200KOhm 25 turns Trimmer Potentiometer allows setting a highly precise range of delays (see datasheet for delay formulas)
  • bottom side contains two unpopulated 0805 resistor pads which can be used to solder custom delay resistors directly on the PCB (see datasheet for delay formulas and possible timings from popular resistor values). These resistors are in parallel allowing you to customize a more precise value compared to using a single resistor
  • a single 10K resistor produces a ~8s delay
  • two 10K resistors in parallel produce a ~1s delay

What you get

  • assembled breakout with TPL5110 chip and a P-mosfet to drive the load
  • separate 1x3 side convenience headers
  • two 10K 5% resistors to experiment basic 1s and 8s delays
  • jumper and header for switching between Timer and OneShot modes
  • see optional 200K 25-Turn Trim Pot resistor for setting highly precise timing/delays


Breadboard test:

A simple test done on a breadboard: an LED is powered through the VDD(out). A single 10K resistor is used to set a 8s sleep cycle. At the end of the cycle the LED is powered ON, then a tap on DONE button cuts power and the power consumption goes to 38nA. The cycle repeats indefinitely (in Timer mode), or just 1 time (in OneShot mode).


Sample project driving an ESP8266 for low power (more details here):