5.4 Serial Flash

The BRD4162A radio board is equipped with an 8 Mbit Macronix MX25R SPI flash that is connected directly to the EFR32. Figure

5.4 Radio Board Serial Flash on page 18 shows how the serial flash is connected to the EFR32.

PC8 (US1_CLK#11)

PC6 (US1_TX#11)

PC7 (US1_RX#11)

PA4 (US1_CS#1)

EFR32

MX25R8035F

SCLK

MOSI

MISO

SCS

VMCU

VDD

8 Mbit

Figure 5.4. Radio Board Serial Flash

The MX25R series are ultra low power serial flash devices, so there is no need for a separate enable switch to keep current consump-

tion down. However, it is important that the flash is always put in deep power down mode when not used. This is done by issuing a

command over the SPI interface. In deep power down, the MX25R typically adds approximately 100 nA to the radio board current con-

sumption.

UG261: EFR32MG12 2.4 GHz 10 dBm Radio Board User's Guide

Peripherals

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