ambiq micro Apollo4 Blue EVB Schnellstart-Handbuch - Seite 14

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Power Supply Options and Measuring Current

The Apollo4 EVB is intended to operate off of a 5 V supply, which is used to generate downstream

voltages.

There are two power supply options for the EVB SoC:

▪ Operate at 1.9 V by default as provided by the on-board power supply (referred to as nominal

"VDD_1.8V"). This can be adjusted to 1.8 V by shorting SB4 shown on the Power Supplies page of the

(1)

EVB schematic

▪ Provide externally supplied power.

The EVB utilizes solder-bridges for connecting and disconnecting rails from power supplies, whether

generated on-board or off-board. Figure 7 shows the solder-bridge connection strategy between various

on-board power supplies and the SoC's power rails.

Figure 7. Apollo4 EVB Power Supplies Solder Bridge Connection

1. Refer to the EVB schematic and assembly drawing for purpose and location of all solder bridges on the

EVB.

QS-A4-4p1

Apollo4 EVB Quick Start Guide

Page 14

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