NEW PRODUCT – Adafruit S-35710 Low-Power Wake Up Timer Breakout – STEMMA QT / Qwiic

5959 iso ORIG 2024 04

NEW PRODUCT – Adafruit S-35710 Low-Power Wake Up Timer Breakout – STEMMA QT / Qwiic

The Adafruit S-35710 Wake Up Timer is 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. 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. We covered this component on EYE ON NPI and thought it would make for a nice breakout in the shop.

Usage is pretty simple: on an 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. It’s 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 inverted, a switch will put the signal through an N-channel FET so the polarity goes the other way.

One thing to note is that on power-up, the OUT line is default low, which means it’s not good for a low-power sleep manager, only for watchdog-like timings. That is to say, you cannot connect this to your microcontroller’s reset or enable the line to self-depower because it will be disabled/reset when powered up. Still, it may be a useful chip for some folks who want to signal after a long delay or have a more complex power management scheme.

To get you going fast, we spun up a custom-made PCB in the STEMMA QT form factor, making it easy to interface. The STEMMA QT connectors on either side are compatible with the SparkFun Qwiic 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 compatible cable.

In stock and shipping now!

5959 top v2 ORIG 2024 04

5959 side ORIG 2024 04

5959 kit v2 ORIG 2024 04

5959 quarter ORIG 2024 04

Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here:

Join Adafruit on Mastodon

Adafruit is on Mastodon, join in!

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Join over 36,000+ makers on Adafruit’s Discord channels and be part of the community!

CircuitPython – The easiest way to program microcontrollers –

Maker Business — “Packaging” chips in the US

Wearables — Enclosures help fight body humidity in costumes

Electronics — Transformers: More than meets the eye!

Python for Microcontrollers — Python on Microcontrollers Newsletter: Silicon Labs introduces CircuitPython support, and more! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — Guardian Robot, Weather-wise Umbrella Stand, and more!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — #NewProds 7/19/23 Feat. Adafruit Matrix Portal S3 CircuitPython Powered Internet Display!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at !

No Comments

No comments yet.

Sorry, the comment form is closed at this time.