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Forum Index : Microcontroller and PC projects : Supervisory IC vs R/C on MCLR...

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Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9078

Posted: 02:09am 29 Dec 2014

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Hi folks.

On page 14 of the Micromite manual, there is a diagram using a couple of resistors and a cap to delay the start-up of the PIC32.

Then there are the likes of the MCP120T-315 which can be connected to the MCLR pin to delay startup. The MCP part is only 45 cents, but if the R/C method works, is there any obvious benefit to using the more advanced MCP part?

Thanks for any comments.

EDIT: I am guessing that the MCP part would be more stable over time and temperature then an R/C network on MCLR, yes?Edited by Grogster 2014-12-30

Smoke makes things work. When the smoke gets out, it stops!

MicroBlocks

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Joined: 12/05/2012
Location: Thailand
Posts: 2209

Posted: 02:20am 29 Dec 2014

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The added benefit is a controlled reset when brown outs occur. It monitors the voltage.
An r/c would not help in that case.
For embedded solutions that need to run unattended for very long periods of time a supervisory chip is a must as is a watchdog.

Microblocks. Build with logic.

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9078

Posted: 02:55am 29 Dec 2014

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Ahhhhhhhh - thanks, TZA - I thought there must be more to them then just startup delay. Useful information. I will proceed along the MCP path rather then R/C path.

Smoke makes things work. When the smoke gets out, it stops!

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