ambiq micro Apollo4 Blue EVB Manuel de démarrage rapide - Page 15

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Hardware Configuration Options

8.1

Power Supply Configuration

The Apollo4 Display Shield is connected to the AMAP4EVB hardware through each of the five GPIO head-

ers 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 AMAP4EVB.

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

VDD_MCU on J3 of AMAP4EVB.

By using an external supply, or the on-board VDD_1V9_PSU rail, the user is able to take accurate current

measurements of the Apollo4 under a variety of conditions offered by the Display Kit without extra load on

the Apollo4 SoC rails. Please consult the AMAP4EVB Quick Start Guide for details on taking current

measurements with the Apollo4 EVB.

QS-A4DK-1p1

Figure 4. PSU page of the Display Shield schematic

Page 15

Apollo4 Display Kit Quick Start Guide

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