NXP Semiconductors EVB-VF522R3, User Manual, Page: 9 / 38

EVB-VF522R3 Platform User’s Guide, Rev. 0, 11/2014
8 Freescale Semiconductor, Inc.
Power management scheme
4.6.2 Analog MCU power scheme
The four analog MCU power rails, VDD12_AFE, VCC_3V3_AFE, VCC_3V3_ADC, and VREF_3V3,
have two powering options (see
Figure 7 ):
1. The default, cost-efficient option through a series ferrite bead filtering the relevant main power rail,
2. The optional, more expensive option when high-quality ADC and DAC performance required -
from the dedicated linear voltage regulators (unpopulated by default).
Details of using the option-selection components, FB504, R632, and R625, as well as J6, the ON/OFF
jumper for the optional linear 1.2V regulator (U511), are described in
Table 15 .
The optional linear 3.3V regulator (U513) does not have an ON/OFF feature
Figure 7. Analog MCU supplies
4.7 Measuring MCU power consumption
The EVB design provides means for measuring currents in the major MCU power rails.