Microchip Technology XLP User Manual page 26

XLP 16-Bit Development Kit User's Guide
3.2.4
A bank of jumpers is available to selectively enable various board components. These
jumpers, located in the "Power Control" block on the board, permit the user to perform
customized power management analysis and configure the board more closely to the
user's application. By removing the jumper for a component, power is disconnected to
the designated IC and supporting circuitry, eliminating power consumption to these
components. See
information on power monitoring.
When the IC PWR switch is set to the "RB2" position, the component select jumpers
determine which components are under software control. Any component not selected
by its corresponding jumper remains disabled.
Component select jumpers are implemented for:
• Serial EEPROM (JP2)
• Modular expansion header (JP6)
• MCP9700 thermistor (JP1)
• ADC/HLVD potentiometer (JP3)
An additional jumper (JP7) selects power for the unpopulated RS-232 serial circuitry.
See
3.2.5
The MCLR switch (S1) is an active-low switch with a pull-up. It resets the PIC24F
microcontroller in either socket. It does not reset the PIC18F14K50 microcontroller
used for USB communication. Therefore, USB communication is not affected by this
switch.
3.2.6
Three capacitive touch pads, based on the Charge Time Measurement Unit (CTMU),
are available. They are multiplexed to three separate analog channels
In many capacitive touch applications, an overlay is used to protect the PCB. Mounting
holes are provided to secure overlay materials for evaluation.
The low pin count devices, supported by the XLP 16-bit board, require that the touch
pads be multiplexed with other board components. Specifically, CT2 is multiplexed with
the temperature sensor circuitry, while CT3 is shared with the "Cap Sense" socket with
the C3 designator. To avoid interference with the pads, observe the modifications noted
in Table
TABLE 3-4:
Cap Touch Button
DS50001873C-page 26
Component Select Jumpers
Section 3.3.2 "Component Power Measurement"
Section 3.2.14 "RS-232 Serial Port Options"
Master Clear Reset (MCLR) Switch
Capacitive Touch Pads
3-4.
CAPACITIVE TOUCH PAD ANALOG INPUT ASSIGNMENTS
1
2
3
for more information.
Analog Input
AN5
AN1 Remove JP5
AN0 Unpopulate C3 socket
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for more
(Table 3-4).
Note