#125
Want to control your microcontroller's power? This may be the answer.
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All links and more in my GitHub
https://github.com/RalphBacon/TPL5110...
In a previous video #122, we explored switching off an Arduino (or other µcontoller) by using the device itself.
In this video, we look at the TPL51110 device which does much the same thing but periodically - hence the timer part of the name.
Adafruit breakout board:
https://learn.adafruit.com/adafruit-t...
An alternative breakout board:
https://lowpowerlab.com/shop/product/147
Aliexpress source of bare SMD chip (lot of 10):
https://www.aliexpress.com/item/10pcs...
TPL5110 Data Sheet
http://www.ti.com/lit/ds/symlink/tpl5...
There are some caveats covered in the video, but here's some extra information you may find useful:
1. The minimum delay/switch on period is 100mS ±0.6%
2. The maximum delay/switch on period is 2 hours ±0.6% (7200 seconds)
3. To get precise timings you will need to parallel two 1% tolerance resistors (the datasheet shows what values)
4. The "DONE" signal back to the TPL5110 from your microcontroller is 100nS minimum
5. The TPL5110 is only available as a surface mount device (and it is tiny)
6. The TPL5110 expects to drive a P-channel MOSFET that switches the power line to the µController. HIGH is OFF and LOW is ON.
7. This device plus supporting components consume about 20µA whilst in switch-off mode
8. This device works on voltages from 1.8 volts to 5.5 volts
9. All pins are 5v tolerant BUT must not exceed VDD + 0.3 volts (so if running on 3.3 volts must not exceed 3.6v)
10. The Adafruit breakout module has a maximum current capability of 4 Amps
In a future video, we'll look at the TPL5111 which is subtly different.
So having watched the video and understood how this device actually works, do you think it has a place in low-powered microcontroller devices (such as home automation, measuring, alarms and the like)?
Comments, observations and question under the video please, I'd love to hear your thoughts.
If you like this video please give it a thumbs up, share it and if you're not already subscribed please consider doing so :)
My channel and blog are here:
/ ralphbacon
https://ralphbacon.blog