Serial Flash - Silicon Laboratories SLWRB4150A User Manual

6.3 Serial Flash

The BRD4150A radio board is equipped with an 8 Mbit Macronix MX25R SPI flash that is connected directly to the EFR32 Mighty
Gecko. Figure 6.3 Radio Board Serial Flash on page 13
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.
silabs.com | Smart. Connected. Energy-friendly.
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
Figure 6.3. Radio Board Serial Flash
UG178: EFR32MG 2400/868 MHz 13 dBm Dual Band Radio Board
VMCU
VDD
SCLK
MOSI
8 Mbit
MISO
SCS
MX25R8035F
Peripherals
Rev. 1.00 | 13