Mikroe EasyPIC PRO v8, User Manual

E a s y P I C  P R O  v 8  M a n u a l

P A G E  11

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Figure 4:  Battery power supply connection

Dual power supply  

EasyPIC PRO v8 development board supports both 3.3V and 5V power supply 
on a single board.  Advanced PSU module provides the possibility to chose 
power supply for board and host MCU, between 3.3V (default) and 5V. This 
setting can be easily configured from CODEGRIP Suite, and this feature 
greatly increases the number of supported MCUs.

To easily indicate the power supply configuration, the previously mentioned 
POWER LED will also have a dual function. It lights up GREEN when 3.3V power 
supply is configured, and lights up BLUE when 5V power supply is chosen.

Powering up the development board

Two touch-sensitive buttons are used to power up and reset the EasyPIC 
PRO v8 development board. These capacitive buttons are processed by 
two AT42QT1011, digital burst mode charge-transfer sensors, specifically 
designed for human-machine interfaces (HMI), from Microchip. The 
AT42QT1011 allows very responsive and reliable touch detection for the 
connected button pad.

As soon as a valid power source is connected, the development board will 
enter the Stand-By mode. When the capacitive POWER button is pressed, the 
PSU module will start distributing the power to the rest of the development 
board. This is indicated by the POWER LED indicator, located on the PSU 
module itself.

Right under the POWER LED, there is a CHARGE LED, indicating the charging 
status of the Li-Po/Li-Ion single cell battery, if connected. The complete 
battery power supply section, including the battery charger circuit, is 
explained in the respective chapter of this manual. 

Below the POWER capacitive button 

(1)

, there is a RESET capacitive button 

(2) 

which is not entirely power-related, but it has a similar function: it is routed 

to the MCLR pin of the MCU, allowing the RESET function to be performed.