Apollo3 Blue Plus EVB Quick Start Guide
Ultra-Low Power Apollo MCU Family
QS_A3P_1p1 Page 12 2020 Ambiq Micro, Inc.
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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.
Figure 7. Header P19 Configured for 3.3V Operation - No Current Measurement
Figure 8 shows the EVB configured for 3.3V operation with current measuring leads across VDD_PS and
VDD_MCU for current measurement.
Figure 8. Header P19 Configured for 3.3V Operation - With Current Measurement
Measuring the current consumption of the target MCU on the board using equipment with a sensing
resistor will create a burden voltage over the resistor on VDD_MCU. In some cases the burden voltage
may be too high and may cause a brown-out event on the target MCU at 1.8V. SB1 on the board can be
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