Power Latch

Ongoing

STD Power Latch

Power_Module

Power

License: MIT

Mode:

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Update time： 2022-02-12 08:21:04

Creation time： 2021-09-21 20:34:11

Description

**Application** This trigger circuit powers the main circuit for a short-time when a contact is closed. Once powered on, the main circuit can control when power is turned off. **Wiring** | Pin | Purpose | | --- | ------- | | VIN | Positive permanent power supply | | GND | Ground, common for power supply and output | | TRIG | Triggers input, powers output when high | | GPIO | Power control for main circuit. While it is held high, power remains on. | | VCC | Power going to circuit |

Design Drawing

schematic diagram

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Schematic
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PCB

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PCB_Power Latch
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	HC-1.25-2PWT	CN1	CONN-SMD_2P-P1.25-HC-1.25-2PWT	1
2	SS14	D1,D2	SMA_L4.4-W2.8-LS5.4-RD	2
3	VCC	PAD1	SINGLEPAD	1
4	GND	PAD2,PAD5	SINGLEPAD	2
5	GPIO	PAD3	SINGLEPAD	1
6	VIN	PAD4	SINGLEPAD	1
7	TRIG	PAD6	SINGLEPAD	1
8	PCH	Q1	SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR	1
9	NPN	Q2	SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR	1
10	100K	R1,R4	R0805	2
11	10K	R2	R0805	1
12	220K	R3,R5	R0805	2
13	TS-1102S-C-A-B	SW2	KEY-SMD_4P-L6.0-W6.0-P4.50-LS8.6	1