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PICList Thread
'[PICLIST] how use capacitor to keep Vcc to run 1-2'
2001\04\14@024337 by Wing Kent Kwan

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how can I do when power supply shut down 1-2second,
to keep the Vcc of MCU to Running 1-2second.
(use capacitor)

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2001\04\14@042736 by Peter Tiang

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   Use diode to supply Vcc to MCU, decoupled
   with a reasonably large reservoir capacitor
   that will keep the juice flowing to the MCU
   for 2 second.

   The diode is to prevent other part of the
   system draining from the cap.

   However, do take care of the reset requirement,
   especially in brownout situation. Your MCU
   might not be in reset, while other part of
   your system already reset.

Regards,
Peter Tiang.

{Original Message removed}

2001\04\14@090243 by Thomas C. Sefranek

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Wing Kent Kwan wrote:

> how can I do when power supply shut down 1-2second,
> to keep the Vcc of MCU to Running 1-2second.
> (use capacitor)
>
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> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.

The Ultracap series will do this just fine.

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2001\04\14@190701 by Terry

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Careful with how you design in a backup supply. If the MCU is still driving
it's outputs you'll be pumping power to other IC's through the input
protection diodes. Shut down the MCU I/O's or have the backup supply power
all necessary IC's in your circuit.

At 04:28 PM 4/14/01 +0800, you wrote:
{Quote hidden}

>{Original Message removed}

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