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ManualsBrandsSILICON LAB ManualsRadio BoardSILICON LABS UG185 EFR32FG1 2400/169 MHz Dual Band Radio Board

5.3 Serial Flash

The BRD4251D Radio Board is equipped with an 8 Mbit Macronix MX25R SPI flash that is connected directly to the EFR32. The figure

below 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 5.3. 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.

UG185: EFR32FG1 2400/169 MHz Dual Band Radio Board User's Guide

Peripherals

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