ambiq micro Apollo3 Blue EVB Quick Start Manual - Page 12

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6.

Power Supply Options and Measuring Current

There are three power supply options for the Apollo3 Blue EVB:
▪ Operate at 3.3V as provided by the on-board power supply
▪ Operate at 1.8V as provided by the on-board power supply
▪ Provide externally supplied power
Figure 6 shows header P19 which is used to select a power configuration through jumper installations, as
well as the option to measure the supply current to the MCU with an ammeter. Solder bridge SB15 can be
filled instead of jumpering from pin 1 to pin 2 if current measuring is of no interest.
Jumper
Jumper
1-2
3-4
In
In
Out
In
Out
In
In
Out
Out
Out
As an example for setting the jumpers on P19, Figure 7 shows the EVB configured for 3.3V operation with
jumper across VDD_PS and VDD_MCU for no current measurement.
QS-A3B-1p00
Figure 6. Voltage Selection on Header P19
Table 2: Jumper Configuration for Power Selections
Jumper
5-6
In
1.8V operation from internal regulator
Intended for current measuring across pins 1 and 2
Out
during 3.3V operation from internal regulator
Intended for current measuring across pins 1 and 2
In
during 1.8V operation from internal regulator
Externally-provided supply voltage within the allowable
Out
range (1.755-3.60V) on pin 3 or 5
Intended for current measuring across pins 1 and 2
Out
during externally-provided supply voltage within the
allowable range (1.755-3.60V) on pin 3 or 5
Page 12
Apollo3 Blue EVB Quick Start Guide
Power Source
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_1.8V
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