SparkFun Soft Power Switch
The Soft Power Switch is a passive, hard on/off switch with software feedback and control. In other words, it's like the on/off switch on a laptop. A simple press will turn the system on. Another press can (with MCU intervention) turn off the system. And if things go really wrong, pressing and holding the button will force a power-down. If you're building something with an enclosed battery and need a good power button, this is the board you need.
The Sense/Control pin can act as an output to a microcontroller indicating the state of the power button (high = not pressed, low = user in pressing power button). This can be used as an input to your firmware to begin to shut down before power is lost. Alternatively, the Sense/Control pin can be driven low by the system forcing power off via software. Additionally, the Fast Off pin can be used to immediately power down a system.
The wake-up and power-down times can be tweaked for your own user experience but we found 500ms for power up and 2s for power down work really well. If needed, pads are provided for a larger, external button. A measurement jumper is available to measure passive and active current so you can verify the quiescent current of your system.
Quick Spec
- Working Voltage: up to 12V
- Very low <50nA quiescent current
- >Hard override power down in case your microcontroller loses its mind
- Sense/Control pin can be connected to a microcontroller
- Dimensions: 26 x 20.8 x 7.3mm
- Met Weight: 4g
Resources
Shipping List
- 1 x SparkFun Soft Power Switch
SparkFun Soft Power Switch
- Brand: Sparkfun
- Product Code: SPX-17870
- Weight: 0.004kg
- Product Status : Active
Stock
| Warehouse | Stock Status | Location |
|---|---|---|
| Centurion | Limited Stock | C40 |
| Stellenbosch | Limited Stock | M100 |
We ship free of charge between branches to complete your order.
-
R78.00 (Inc Tax: R89.70)
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Tags: sparkfun, soft, power, switch, passive, on/off, feedback