#172 LTC2954 Push Button On-Off Emulator - cheap upgrade for your Arduino project
How to request a graceful shutdown of your microcontroller project without using an LTC2954.
JLCPCB Prototype for $2 & Free SMT assembly: https://jlcpcb.com/
Free coupons for SMT assembly - just pay for the components
More information (including all links, sketches & PDFs in my GitHub):
https://github.com/RalphBacon/172-LTC2954-On-Off-Emulator
The Linear Technology **LTC2954** device allows a single push button on *and* off of your microcontroller (via a P-channel MOSFET). Additionally it can request an emergency shutdown via a user-configurable delay by pressing and holding the aforementioned button for several seconds.
Here's how to emulate the first two features using our previously used (video #123) Auto Shutoff dual MOSFET circuitry with just a couple of extra components.
Compare the two circuits in my GitHub; the one of the left is the original circuit; the other is the modified circuit to allow a graceful shutdown request to be be sent to the µController.
The two additional diodes are just IN4148 small signal diodes. Nothing special!
The shutdown request is serviced by the microcontroller on an interrupt pin. Full details in the video.
More information (including all links, sketches & PDFs in my GitHub):
https://github.com/RalphBacon/172-LTC2954-On-Off-Emulator
### LINKS
Linear Technologies **LTC2954** from RS Components UK Warehouse, about £3 / $4:
https://uk.rs-online.com/web/c/semiconductors/power-management-ics/voltage-supervisors/?searchTerm=LTC2954
**LTC2954** From AliExpress, $10 for 5 pieces free shipping:
http://s.click.aliexpress.com/e/nLNYrk4s
DUAL MOSFET CJMCU-4599 Si4599 N and P Channel MOSFET Expansion Board $1.89 each or $4.08 for 3 pieces:
**Single:** https://www.banggood.com/CJMCU-4599-Si4599-N-and-P-Channel-40V-D-S-MOSFET-Expansion-Board-Module-p-1350610.html?p=FQ040729393382015118&utm_campaign=25129675&utm_content=3897
**3 Pieces:** https://www.banggood.com/3pcs-CJMCU-4599-Si4599-N-and-P-Channel-40V-D-S-MOSFET-Expansion-Board-Module-p-1363266.html?p=FQ040729393382015118&utm_campaign=25129675&utm_content=3897
**Datasheet for LTC2954**:
https://www.analog.com/media/en/technical-documentation/data-sheets/2954fb.pdf
**Datasheet for Si4599** dual MOSFET:
https://www.vishay.com/docs/68971/si4599dy.pdf
Interactive **cheat sheet** for calculating potential (resistor) divider values:
http://www.ohmslawcalculator.com/voltage-divider-calculator
### List of all my videos
(Special thanks to Michael Kurt Vogel for compiling this)
http://bit.ly/YouTubeVideoList-RalphBacon
### My blog article on what happened to my eye (again):
https://ralphbacon.blog/?p=340
More information (including all links, sketches & PDFs in my GitHub):
https://github.com/RalphBacon/172-LTC2954-On-Off-Emulator
### Popular Links
YIHUA 938D Portable Hot **Tweezers Mini** Soldering Station 110V/220V
https://bit.ly/2M8R0bj
DANIU Heavy Duty Soldering Solder Iron **Tip Cleaner** Steel Wire $3.33 from China, higher price local warehouse
http://bit.ly/SolderingIronCLeaner
SMD Components Solder **Practice Module Kit** - all components incl QFP chips
http://bit.ly/SMDPracticeBoard
If you like this video please give it a thumbs up, share it and if you're not already subscribed please consider doing so and joining me on my Arduinite journey
My channel, GitHub and blog are here:
------------------------------------------------------------------
https://www.youtube.com/RalphBacon
https://ralphbacon.blog
https://github.com/RalphBacon
------------------------------------------------------------------
Видео #172 LTC2954 Push Button On-Off Emulator - cheap upgrade for your Arduino project канала Ralph S Bacon
JLCPCB Prototype for $2 & Free SMT assembly: https://jlcpcb.com/
Free coupons for SMT assembly - just pay for the components
More information (including all links, sketches & PDFs in my GitHub):
https://github.com/RalphBacon/172-LTC2954-On-Off-Emulator
The Linear Technology **LTC2954** device allows a single push button on *and* off of your microcontroller (via a P-channel MOSFET). Additionally it can request an emergency shutdown via a user-configurable delay by pressing and holding the aforementioned button for several seconds.
Here's how to emulate the first two features using our previously used (video #123) Auto Shutoff dual MOSFET circuitry with just a couple of extra components.
Compare the two circuits in my GitHub; the one of the left is the original circuit; the other is the modified circuit to allow a graceful shutdown request to be be sent to the µController.
The two additional diodes are just IN4148 small signal diodes. Nothing special!
The shutdown request is serviced by the microcontroller on an interrupt pin. Full details in the video.
More information (including all links, sketches & PDFs in my GitHub):
https://github.com/RalphBacon/172-LTC2954-On-Off-Emulator
### LINKS
Linear Technologies **LTC2954** from RS Components UK Warehouse, about £3 / $4:
https://uk.rs-online.com/web/c/semiconductors/power-management-ics/voltage-supervisors/?searchTerm=LTC2954
**LTC2954** From AliExpress, $10 for 5 pieces free shipping:
http://s.click.aliexpress.com/e/nLNYrk4s
DUAL MOSFET CJMCU-4599 Si4599 N and P Channel MOSFET Expansion Board $1.89 each or $4.08 for 3 pieces:
**Single:** https://www.banggood.com/CJMCU-4599-Si4599-N-and-P-Channel-40V-D-S-MOSFET-Expansion-Board-Module-p-1350610.html?p=FQ040729393382015118&utm_campaign=25129675&utm_content=3897
**3 Pieces:** https://www.banggood.com/3pcs-CJMCU-4599-Si4599-N-and-P-Channel-40V-D-S-MOSFET-Expansion-Board-Module-p-1363266.html?p=FQ040729393382015118&utm_campaign=25129675&utm_content=3897
**Datasheet for LTC2954**:
https://www.analog.com/media/en/technical-documentation/data-sheets/2954fb.pdf
**Datasheet for Si4599** dual MOSFET:
https://www.vishay.com/docs/68971/si4599dy.pdf
Interactive **cheat sheet** for calculating potential (resistor) divider values:
http://www.ohmslawcalculator.com/voltage-divider-calculator
### List of all my videos
(Special thanks to Michael Kurt Vogel for compiling this)
http://bit.ly/YouTubeVideoList-RalphBacon
### My blog article on what happened to my eye (again):
https://ralphbacon.blog/?p=340
More information (including all links, sketches & PDFs in my GitHub):
https://github.com/RalphBacon/172-LTC2954-On-Off-Emulator
### Popular Links
YIHUA 938D Portable Hot **Tweezers Mini** Soldering Station 110V/220V
https://bit.ly/2M8R0bj
DANIU Heavy Duty Soldering Solder Iron **Tip Cleaner** Steel Wire $3.33 from China, higher price local warehouse
http://bit.ly/SolderingIronCLeaner
SMD Components Solder **Practice Module Kit** - all components incl QFP chips
http://bit.ly/SMDPracticeBoard
If you like this video please give it a thumbs up, share it and if you're not already subscribed please consider doing so and joining me on my Arduinite journey
My channel, GitHub and blog are here:
------------------------------------------------------------------
https://www.youtube.com/RalphBacon
https://ralphbacon.blog
https://github.com/RalphBacon
------------------------------------------------------------------
Видео #172 LTC2954 Push Button On-Off Emulator - cheap upgrade for your Arduino project канала Ralph S Bacon
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