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Adafruit S-35710 Low-Power Wake Up Timer Breakout

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Adafruit S-35710 Low-Power Wake Up Timer Breakout

The Adafruit S-35710 Wake Up Timer Breakout is an ultra-low-power watchdog timer that can be programmed to trigger an alarm from 1 second up to 194 days, using a 24-bit second counter. Drawing only 0.2 µA, it's an interesting alternative to a real-time clock for projects that need a separate, independently-powered chip to handle long-delay timing and alarms.

Usage is straightforward: write the desired delay to the timer register over I2C, and the OUT pin goes high. When the count matches the register value, the OUT pin goes low. An onboard switch lets you invert the output polarity via an N-channel FET.

Key Features

  • S-35710 Timer IC – 24-bit second counter with configurable alarm from 1 second to ~194 days
  • Ultra-Low Power – Only 0.2 µA current draw during operation
  • I2C Interface – Simple register write to set the timer delay
  • Open-Drain Output – OUT pin goes low when timer expires; invertible via onboard switch
  • STEMMA QT / Qwiic Connectors – Two JST SH connectors for solderless daisy-chaining
Note: On power-up, the OUT line defaults to low. This means it cannot be used as a self-depower sleep manager (connecting to a microcontroller's reset or enable line), as the device would remain disabled/reset at power-up. It is best suited for watchdog-like timing or signalling after a long delay.

Ideal For

  • Ultra-low-power watchdog timing
  • Long-delay alarm signalling (hours to months)
  • Battery-powered sensor wake-up schemes
  • Complex power management systems with external timing

Package Contents

  • 1× Adafruit S-35710 Low-Power Wake Up Timer Breakout
Tip: STEMMA QT / Qwiic cable is not included. Use a compatible JST SH cable for solderless connection, or solder directly to the header pads.
$9.82
Adafruit S-35710 Low-Power Wake Up Timer Breakout—
$9.82

Product Information

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Description

The Adafruit S-35710 Wake Up Timer Breakout is an ultra-low-power watchdog timer that can be programmed to trigger an alarm from 1 second up to 194 days, using a 24-bit second counter. Drawing only 0.2 µA, it's an interesting alternative to a real-time clock for projects that need a separate, independently-powered chip to handle long-delay timing and alarms.

Usage is straightforward: write the desired delay to the timer register over I2C, and the OUT pin goes high. When the count matches the register value, the OUT pin goes low. An onboard switch lets you invert the output polarity via an N-channel FET.

Key Features

  • S-35710 Timer IC – 24-bit second counter with configurable alarm from 1 second to ~194 days
  • Ultra-Low Power – Only 0.2 µA current draw during operation
  • I2C Interface – Simple register write to set the timer delay
  • Open-Drain Output – OUT pin goes low when timer expires; invertible via onboard switch
  • STEMMA QT / Qwiic Connectors – Two JST SH connectors for solderless daisy-chaining
Note: On power-up, the OUT line defaults to low. This means it cannot be used as a self-depower sleep manager (connecting to a microcontroller's reset or enable line), as the device would remain disabled/reset at power-up. It is best suited for watchdog-like timing or signalling after a long delay.

Ideal For

  • Ultra-low-power watchdog timing
  • Long-delay alarm signalling (hours to months)
  • Battery-powered sensor wake-up schemes
  • Complex power management systems with external timing

Package Contents

  • 1× Adafruit S-35710 Low-Power Wake Up Timer Breakout
Tip: STEMMA QT / Qwiic cable is not included. Use a compatible JST SH cable for solderless connection, or solder directly to the header pads.