Microchip Technology XLP User Manual page 24

XLP 16-Bit Development Kit User's Guide
3.2.3
The XLP 16-bit board can use any one of six power options for full operation:
1. Bus power via the USB connector (J9). This provides a nominal 5V power
source, regulated to approximately 3.3V for the microcontroller and board com-
ponents, through a Schottky diode and Low Dropout (LDO) regulator circuit (D7,
Q1). The green power LED (D5) is illuminated when this power source is used
and bus power is present.
2. An unregulated supply of 9 VDC nominal (range of 5V to 12V) is supplied to J6.
For default functionality, a center hot power supply with a current capability of
100 mA is sufficient. A larger power supply can be used, up to 700 mA, and may
be needed to support PICtail interface accessories. This voltage is fed into the
on-board regulator. The green power LED is illuminated when this power source
is used and power is present.
Note 1:
3. Two AAA batteries (not included) installed in BT2. The output voltage is not regu-
lated by the LDO, so the microcontroller and board run at the voltage provided by
the battery pair. To minimize current consumption, the power LED is not illuminated
for this power source.
4. A CR2032 coin cell battery (not included) installed in BT1. As with the AAA battery
option, the microcontroller and board run directly from the 3V nominal battery
voltage, and the power LED is not illuminated.
5. Two headers (one 5-pin, one 6-pin 0.05" pitch) are provided to connect with exter-
nal energy harvesting development systems. The headers are industry standard
sizes commonly used with energy harvesting applications. If you plan to use an
energy harvesting system, verify pin compatibility before proceeding.
6. An external, regulated DC power supply connected to the V
GND test points. Voltage is supplied to the board and microcontroller without
voltage drops or voltage regulation; therefore, the supply voltage must meet the
voltage requirements for the installed PIC24F device. The power LED does not
illuminate in this configuration.
The installed PIC24F16KA102 operates between 1.8V to 3.6V. Refer to the
appropriate device data sheet for other devices.
A four-way jumper block, POWER SOURCE SELECT (J12), selects the power supply
option. The available options are USB/EXT PWR, AAA, 2032 and HARVEST
(Methods 1 through 5, above). The default configuration (as shipped) is USB Power
mode. The jumper block does not control external power applied directly to the board
(Method 6), since the test point is located in the circuit after the block.
3.2.3.1
The component power switch, IC PWR (S7), allows for software-enabled control of
power by the PIC24F device to many of the board components. When the switch is in
the "RB2" position, the RB2 port pin can control power to components using a
P channel FET switch (U3). This permits experimentation with a popular technique to
reduce an application's power consumption and extend battery life.
When the switch is in the "ON" position, component power is selected only by the
corresponding component select jumper. See
Jumpers"
DS50001873C-page 24
Power Sources
The XLP 16-Bit Development Kit does not include a power supply. If an
external supply is needed, use Microchip part number AC162039.
2: The regulated power supply options are provided for easier develop-
ment. Power consumption by a regulator circuit is not included in board
power measurement.
COMPONENT POWER SWITCH
for additional information.
SRC and one of the
DD
Section 3.2.4 "Component Select
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