{"title":"Adafruit S-35710 Low-Power Wake Up Timer Breakout","handle":"adafruit-s-35710-low-power-wake-up-timer-breakout-ada5959","url":"/products/adafruit-s-35710-low-power-wake-up-timer-breakout-ada5959","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.\n\nUsage 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.\n\nKey Features\n\n\nS-35710 Timer IC – 24-bit second counter with configurable alarm from 1 second to ~194 days\n\nUltra-Low Power – Only 0.2 µA current draw during operation\n\nI2C Interface – Simple register write to set the timer delay\n\nOpen-Drain Output – OUT pin goes low when timer expires; invertible via onboard switch\n\nSTEMMA QT / Qwiic Connectors – Two JST SH connectors for solderless daisy-chaining\n\n\n\nNote: 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.\n\n\nIdeal For\n\nUltra-low-power watchdog timing\nLong-delay alarm signalling (hours to months)\nBattery-powered sensor wake-up schemes\nComplex power management systems with external timing\n\n\nPackage Contents\n\n1× Adafruit S-35710 Low-Power Wake Up Timer Breakout\n\n\n\nTip: STEMMA QT / Qwiic cable is not included. Use a compatible JST SH cable for solderless connection, or solder directly to the header pads.\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":1031,"title":"Default Title","sku":"AF-5959","mpn":"ADA5959","price":9.82,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":37,"option1":"Default Title"}]}