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Hardware Detail
A.12 SUPERCAPACITOR
The 0.33F (C5) Supercapacitor is used to demonstrate the low power capabilities of
PICmicro devices. This circuit requires all other peripherals to be disconnected from
the circuit. The Supercapacitor code, included on your PICDEM 4 CD, is configured so
that the device will remain in SLEEP most of the time, while a 32 kHz watch crystal (Y2)
connected to Timer1 keeps the PICmicro MCU running.
The device wakes up every second and toggles a port pin, and a second port pin indi-
cates the power start-up. If a power source is present, a high level is maintained;
otherwise, in the absence of power, the pin will go low.
In the event of a power failure, the Supercapacitor will supply the PICmicro MCU with
power through an internal protection diode on a port pin. If the user desires to measure
the Supercapacitor supply time, they will have to observe the power signals with an
oscilloscope or another demo board.
Note:
The Supercapacitor circuit described in this manual is used only to demon-
strate the low power capability of the device. The Supercapacitor is used as
an example for the low power source. DO NOT use this circuit as a
general design practice.
For Supercapacitor operation, these jumpers must be configured as follows:
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J3 - OFF (Power Supply)
J4 - OFF (Power Supply)
J22 - OFF (PORTA LEDs)
J23 - ON (Supercapacitor)
J26 - OFF (Potentiometer)
J27 - OFF (Potentiometer)
J28 - ON (LVD)
? 2003 Microchip Technology Inc.
DS51337A-page 17
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