ambiq micro Apollo4 Blue Plus Manuale di avvio rapido - Pagina 16

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Hardware Configuration Options

8.1

Power Supply Configuration

The Apollo4 Plus Display Shield is connected to the AMAP4PEVB hardware through each of the five GPIO

headers present on the EVB, as well as the high-speed connector, and as a result the display shield

derives its power supplies from the 5V USB supply of the EVB. The two derived power supplies are:

▪ VDD_1V9_PSU – Default 1.9V, configurable to 1.8V by shorting solder-bridge SB3

▪ VDD_3V3

The VDD_1V9_PSU rail is by default the source of power for the SHIELD_PSU rail, which is the supply for

each of the 1.9V on the display shield. However, by using solder bridges SB4 and SB5, the user can con-

figure the SHIELD_PSU rail to be supplied by an external supply, VDD_MCU of the Apollo4 EVB, or by the

default option of VDD_1V9_PSU.

▪ External Supply – Open SB4, Short SB5 on Display Shield, connect external supply to VDD_EXT on J3

of AMAP4PEVB.

▪ VDD_MCU of AMAP4PEVB – Open SB4, Short SB5, connect jumper between VDD_EXT and

VDD_MCU on J3 of AMAP4PEVB.

QS-A4PDK-1p0

Figure 5. PSU page of the Display Shield schematic

Page 16

Apollo4 Plus Display Kit Quick Start Guide

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