SparkFun

Soft Power Switch - JST 2mm

Name: Soft Power Switch - JST 2mm
Brand: SparkFun
SKU: SF-PRT-26993
Price: 14.45 AUD
Availability: InStock

· MPN: PRT-26993

Buttons & Switches Power Management

$14.45 |

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This compact power-control board gives battery-powered projects a laptop-style on/off button while still allowing your microcontroller to take part in the sh...

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This compact power-control board gives battery-powered projects a laptop-style on/off button while still allowing your microcontroller to take part in the shutdown process. A quick press turns the system on, another press can be handled by the MCU for an orderly shutdown, and a long press provides a hard power-down override if your code gets stuck.

It is built around a fully digital Texas Instruments design and includes a self-resetting 2A fuse, VIN and VOUT status LEDs, and very low quiescent current to help preserve battery life. This version is fitted with JST 2mm battery connectors and is intended for DC loads up to 5.5V only.

The board breaks out GND, VIN, VOUT, BTN, PUSH and OFF through PTH pads. Connect PUSH and OFF to your microcontroller to detect button presses and request a controlled power-off, or add an external momentary button between BTN and GND.

Supporting documentation from SparkFun includes schematic files, KiCad files, a 3D model, board dimensions, hookup guide, component datasheets, an example sketch and the hardware repo.

Features:

Software feedback and control: passive, hard on/off switching with MCU interaction.
Simple press on: a simple press will turn the system on.
MCU-assisted power-off: another press can, with MCU intervention, turn off the system.
Hard override: pressing and holding the button for ~10 seconds will force a power-down.
Overcurrent protection: self-resetting 2A fuse.
Visual feedback: input and output LEDs.
Microcontroller pins: PUSH and OFF pins for monitoring button presses and initiating controlled shutdown.
Timing control: wake-up and power-down times can be customised.
Battery charging: supports battery charging while powering your project.
Load type: designed for DC loads and not designed for AC loads.

Specifications:

Input voltage: 5.5V maximum, 1.8V minimum
Typical input: Typically ~3.7V from a single cell LiPo Battery
Maximum current draw: 2A continuous, 4A peak (fuse protected)
MOSFET: SIL2308 N&P-Channel MOSFET
P-Channel on-resistance: 70mΩ (0.070 Ohm) typical P-Channel on-resistance
Quiescent current: Very low quiescent current: <1µA @ 3.75V, with VIN LED disabled
Connectors: 2x 2-Pin JST Right-Angle Connectors
VIN: VIN
VOUT: VOUT
Battery charging: Supports battery charging
Push button: Built-in momentary push button
Hard override: push and hold the button for ~10 seconds
Breakout PTH: provided
Breakout PTH pins: GND, VIN, VOUT
BTN: if desired, connect an external button between BTN and GND
PUSH: open-drain output, requires pull-up, low indicates button is pushed
OFF: drive high to turn the output off
LEDs: VIN and VOUT (can be disabled if desired)
Jumpers: provided
Input power LED: Input power LED
Output power LED: Output power LED
Dimensions: 1.0in. x 1.0in. (25.4mm x 25.4mm)
Weight: 3.10g

A handy choice for enclosed LiPo-powered builds that need a reliable front-panel power button and controlled shutdown behaviour.

Jargon buster

Plain-language definitions for the technical terms used above.

breakout: A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
DC: DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
GND: GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
LED: A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
LiPo: A LiPo (lithium polymer) battery is a rechargeable lithium battery widely used in portable projects because it is light and compact. LiPo cells need correct charging circuitry and careful handling to stay safe, so equipment that supports LiPo generally includes charging or protection hardware suited to that battery type.
microcontroller: A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
PTH: Plated through-hole means the pin holes are metal-lined so solder connects the pad on both sides of the board. It is useful for connectors and headers that need a strong mechanical and electrical connection.