ambiq micro Apollo1 EVB Manuale di avvio rapido - Pagina 10
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Power Supply Options and Measuring Current
There are three power supply options for the Apollo1 EVB:
▪ Operate at 3.3V as provided by the onboard power supply
▪ Operate at 2.1V as provided by the onboard power supply
▪ Provide externally supplied power
Figure 5 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.
Table 2 shows valid jumper configurations for P19. All other configurations are invalid. Note that a jumper
across pins 7 and 8 is not necessary and does not do anything - the pins are available only for easy access
to ground.
Jumper
Jumper
1-2
3-4
In
In
In
In
Out
In
Out
In
In
Out
Out
Out
QS-A1-1p00
Figure 5. Voltage Selection on Header P19
Jumper
5-6
Out
3.3V operation from internal regulator
In
2.1V 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 2.1V operation from internal regulator
Externally-provided supply voltage within the allowable
Out
range (1.8-3.8V) on pin 3 or 5
Intended for current measuring across pins 1 and 2
Out
during externally-provided supply voltage within the
allowable range (1.8-3.8V) on pin 3 or 5
Table 2: Jumper Configuration for Power Selections
Page 10 of 12
Apollo EVB Quick Start Guide
Power Source
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