Digilent 410-273P-KIT Manuel d'utilisateur télécharger pdf (Page 5)

WF32 Reference Manual

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Page 5 of 24

LDO In is the input to the on-board linear regulator.

LDO Out is the output of the on-board linear regulator

VU is the unregulated input voltage selected by the jumper setting jumper block J15.

5V0 is the connection to the VCC5V0 power bus on the WF32 board.

EN Ext is a signal provided to enable an external voltage regulator if one is being used. This would allow the sketch

running on the WF32 to turn on/off the external voltage regulator. When used with an external voltage regulator,

this allows the board to go into an extremely low power operating mode. This signal is connected to Port D, bit 13

(RD13) on the PIC32 microcontroller. This is accessible using digital pin 64.

GND is a connection to the digital ground bus on the WF32 board.

To completely disable operation of the on-board linear regulator, remove all shorting blocks from J16.

To use the on-board 5V regulator, use the provided shorting blocks to connect VU to LDO In, and to connect LDO

Out to 5V0, as follows:

LDO OutLDO In

VU 5V0

GNDEN Ext

Note: In this case, when J15 is in the EXT position, and J16 is jumpered to regulate the external input, do not apply

more than 18V. This can destroy the 5.0V regulator.

To bypass the on-board 5V regulator when powering the board from an externally regulator 5V power supply, such

as USB, Use one of the provided shorting blocks to connect VU to 5V0, as follows:

LDO OutLDO In

VU 5V0

GNDEN Ext

An external 5V regulator can be used. This would be desirable, for example, when operating from batteries. An

external switch mode 5V regulator could be used to provide higher power efficiency than the on-board linear

regulator. In this case, use wires as appropriate to connect VU to the unregulated input of the external regulator.

Connect the regulated 5V output to 5V0. Connect GND to the ground connection of the external regulator.

Optionally, connect EN Ext to the enable input control of the external regulator, if available. This allows the

external regulator to be turned off for low power operation. Digital pin 64 is then used to turn on/off the external

regulator.

The PIC32MX695 microcontroller is rated to use a maximum of 98mA of current when operating at 80Mhz. The

MRF24WG0MA WiFi module typically consumes a maximum of 237mA when transmitting. This allows

approximately 265mA of current to power the remaining 3.3V circuitry on the WF32 board and external circuitry

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Digilent 410-273P-KIT Manuel d'utilisateur Page 5