SPWF04SA datasheet(11/27 Pages) STMICROELECTRONICS

11 / 27 page

SPWF04SA, SPWF04SC

Pinout description

DocID029757 Rev 5

11/27

Pinout description

Table 5: Pinout description

Signal name

Type

number

Function

Notes

GPIOs - general purpose input/output

GPIO[0]

– GPIO[18]

I/O

See Table 6: "GPIOs main and alternate functions" for

corresponding pin numbers, main and alternate functions

Host interface (1)

RXD/MOSI

5 V tolerant

TXD/MISO

5 V Tolerant

CTS/nCS

Active low, 5 V tolerant

RTS/CLK

5 V tolerant

Reset (2)

RESETn

Reset input

Active low for 5 ms with pull

up to 3.3 VDC. Not 5 V

tolerant

Bootloader

BOOT0

Boot loader (3)

External memory interface (4)

SDIO CLK / SPI CLK

SDIO D0 / SPI MISO

SDIO CMD / SPI MOSI

Other pins

VCC (3.3 V)

Voltage Supply

Decouple with 10 µF

capacitor

Ground

Ground Paddle

Ground

Add plenty of Ground vias

for thermal dissipation and

ground

GPIO19 / LSE(5)

GPIO20 / HSE(5)

SWD I/O

SWD CLK

Notes:

(1)See Section 7: "Pinout description" for a UART and SPI selection modes and interface details.

(2)In order to recover from unexpected behavior, the HOST processor, when connected, could conveniently

control the RESETn pin of the module.

(3)To enable the firmware download, pin BOOT0 needs to be high during power up. RESETn needs to be

pulled low at least 5 ms to initiate the firmware download sequence.

(4)Automatic detection via the configuration variable ext_volume.

(5)Reserved for future usage

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