User guide

Si471x-EVB

8 Preliminary Rev. 0.4

3.2.2. Microcontroller

Figure 9. MCU Block Diagram

The Si471x evaluation environment uses a Silicon Laboratories' C8051F342 microcontroller to control the Si471x

and to provide USB connectivity to the EVB (via J79). The LED D1 illuminates to confirm that power is being

properly supplied to the C8051F342 and that firmware has been loaded. Push-button PB1 manually resets the

C8051F342. The JTAG connector J74 is used to program the C8051F342 at production time, and is not necessary

for further development.

MCU

C8051F342

Si471x

SEN~

6 7 8

19 18 17

SCLK

SDIO

GPO1

GPO2

GPO3/

DCLK

RST~

MS_SENB

MS_RSTB

MS_SCLK

MS_SDIO

S_GPO3/DCLK

MS_GPIO2

SD_GPO1

DAUGHTER BOARD

MD_GPIO3

TC_BCLK

(for digital tx/rx make

sure to connect this)

Jumper

J41

MD_GPIO1

MD_GP4

J74

JTAG

PB1

Reset

J79

USB

Jumper

J65