ambiq micro Apollo2 Blue Manuale di avvio rapido - Pagina 12
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6.
Power Supply Options and Measuring Current
There are three power supply options for the Apollo2 Blue EVB:
▪ Operate at 3.3V as provided by the on-board power supply
▪ Operate at 1.9V 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 SB4 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
In
Out
Out
In
Out
QS-A2Br0_3-1p00
Figure 6. Voltage Selection on Header P19
Table 2: Jumper Configuration for Power Selections
Jumper
3-4
5-6
In
In
1.9V operation from internal regulator
Intended for current measuring across pins 1 and 2
In
Out
during 3.3V operation from internal regulator
Intended for current measuring across pins 1 and 2
In
In
during 1.9V operation from internal regulator
Externally-provided supply voltage within the allowable
Out
Out
range (1.9-3.6V)
Intended for current measuring across pins 1 and 2
Out
Out
during externally-provided supply voltage within the
allowable range (1.9-3.6V) on pin 3 or 5
Apollo2 Blue EVB Quick Start Guide
SB4
Power Source
a
on pin 3 or 5
Page 12
_1.9V
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