ambiq micro Apollo4 Blue EVB Quick Start Manual - Page 16

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Apollo4 EVB Quick Start Guide

As shown in Figure 10 and Figure 11, headers J2 and J3 provide easy access to the various system and

chip-level power supplies present on the EVB. These can be used in conjunction with the above solder-

bridges to measure current, monitor voltage, or provide externally generated power to each specific rail.

Figure 10. Apollo4 EVB Voltage Test Points on Header J2

Figure 11. Apollo4 EVB Voltage Selection on Header J3

8.1

Measuring Current

If the user wants to use a separate power supply for the EVB, then SB3 shown in Figure 7 should be cut,

and either SB5 should be shorted or pins 3 and 4 of J3 should be jumped. The external power rail can be

applied to VDD_EXT on J3, pin 3. Consult the electrical specifications in the Apollo4 Datasheet for the

acceptable operating range for VDD_MCU.

Note: The J-Link I/O voltage should be set to the new VDD_IO of the chip, and therefore SB19 (not shown

in Figure 7) should be opened and SB20 should be shorted (soldered).

Use of the EVB using the on-board SoC supply may be restored by disconnecting the external supply (if

connected) and either shorting SB3 once again or jumping between pins 1 and 2 of J3. The J-Link I/O

voltage also should be restored.

QS-A4-4p1

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