{"product_id":"adafruit-s-35710-low-power-wake-up-timer-breakout-stemma-qt-qwiic","title":"Adafruit S-35710 Low-Power Wake Up Timer Breakout","description":"\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAdafruit S-35710 Wake Up Timer\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eis a low power 'watchdog timer' chip that can be programmed to alert with a digitally-configurable alarm from 1 second up to 194 days, thanks to a 24-bit second counter.\u003c\/p\u003e\n\u003cp\u003e It's an interesting alternative to a real time clock or internal sleep timer and might be useful for some ultra-low-power projects that want to have a separate (and possibly separately-powered) chip to handle time-keeping and alarms.\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.youtube.com\/watch?v=htl2uyHUViM\"\u003eWe covered this component on EYE ON NPI and thought it would make for a nice breakout in the shop\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eUsage is pretty simple: on I2C write of the timer register, the chip starts counting from 0 seconds up and the OUT pin goes high. When the count matches the timer register, the OUT pin goes low. Simple, and like we mentioned, it's very low power, drawing only 0.2uA. The output is open-drain, and if you want to have it be inverted, there's a switch that will put the signal through an N-channel FET so the polarity goes the other way.\u003c\/p\u003e\n\u003cp\u003eOne thing to note, is that on power-up the OUT line is default low, which means its not good for a low-power sleep manager, only for watch-dog-like timings. That is to say, you cannot connect this to your microcontroller's reset or enable line to self-depower because it will be disabled\/reset when powered up. Still, maybe a useful chip for some folks who want to signal after a long delay or have a more complex power management scheme.\u003c\/p\u003e\n\u003cp\u003eTo get you going fast, we spun up a custom-made PCB in the\u003ca rel=\"noopener\" href=\"\/en-au\/collections\/stemma-qt\" title=\"STEMMA QT form factor\" target=\"_blank\"\u003e \u003cstrong\u003eSTEMMA QT\u003c\/strong\u003e form factor\u003c\/a\u003e, making it easy to interface with. The \u003ca href=\"https:\/\/learn.adafruit.com\/introducing-adafruit-stemma-qt\/what-is-stemma-qt\"\u003eSTEMMA QT connectors\u003c\/a\u003e on either side are compatible with the \u003ca href=\"https:\/\/www.sparkfun.com\/qwiic\"\u003eSparkFun Qwiic\u003c\/a\u003e I2C connectors. This allows you to make solderless connections between your development board and the S-35710 or to chain it with a wide range of other sensors and accessories using a \u003ca rel=\"noopener\" href=\"\/en-au\/products\/jst-sh-cable-qwiic-stemma-qt-compatible\" target=\"_blank\"\u003e\u003cstrong\u003ecompatible cable\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTechnical Details\u003c\/h2\u003e\n\u003cimg src=\"https:\/\/www.adafruit.com\/includes\/templates\/shop2019\/images\/RoHS2_2011_65_EU.svg\" alt=\"RoHS 2 2011 65 EU Compliant\" width=\"145\" height=\"80\"\u003e\u003cimg src=\"https:\/\/www.adafruit.com\/includes\/templates\/shop2019\/images\/RoHS2_2015_863_EU.svg\" alt=\"RoHS 2 2015 863 EU Compliant\" width=\"145\" height=\"80\"\u003e\n\u003ch2\u003eLearn\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/learn.adafruit.com\/adafruit-s-35710-low-power-wake-up-timer-breakout\"\u003ePrimary Guide: Adafruit S-35710 Low-Power Wake Up Timer Breakout\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":56500168556917,"sku":"ADA5959","price":4.13,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0389\/1025\/files\/5959-00.jpg?v=1766148618","url":"https:\/\/wholesale.pimoroni.com\/en-au\/products\/adafruit-s-35710-low-power-wake-up-timer-breakout-stemma-qt-qwiic","provider":"Pimoroni Wholesale","version":"1.0","type":"link"}