User manual

Getting Started
 2011 Microchip Technology Inc. DS41614A-page 17
2.4 POWERING FROM EXTERNAL POWER SUPPLY
To power from an external power supply, perform the following steps:
1. Make sure a jumper or an ammeter is connected across J4.
2. Connect V
REF+ to EXT SUPP (+), connect VREF- to EXT SUPP(-).
3. Verify the supply voltage to be between 1.8 and 3.6V. For proper LCD contrast,
the supply should be 3.3V.
4. Populate EXT PWR jumper, J5.
5. Turn on the power supply.
FIGURE 2-3: POWERING WITH EXTERNAL POWER SUPPLY