Adafruit
Adafruit S-35710 Low-Power Wake Up Timer Breakout
· MPN: ADA5959
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, usi...
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
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
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- N-channel FET
- A type of transistor commonly used as a low-side electronic switch for controlling power to LEDs, motors, and other loads. Knowing this helps explain why the board can drive more current than a microcontroller pin could handle on its own.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
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