User's Manual
Pinout description
SPWF04SA, SPWF04SC
Table 5. Pinout description (continued)
Signal name
Type
Pin number
Main function
Alternate
functions
(1)
Notes
GPIO[14]
I/O
14
LED drive, Power
up
UART pins
RXD /
MOSI
I
8
5V tolerant
TXD /
MISO
6
5V Tolerant
CTS / nCS
I
9
Active low, 5V tolerant
RTS / CLK
O
10
5V tolerant
Reset
RESETn
I
3
Reset input
Active low for 5 ms
with pull up to
2.5VDC. Not 5V
tolerant
Supply pins and paddle
3.3 V
24
Voltage supply
Decouple with 10uF
capacitor
Ground
23
Ground
LSE
34
HSE
35
SWD I/O
26
SWD CLK
29
GPIO16
27
Not available
GPIO17
28
Not available
GPIO18
30
Not available
SDIO CLK /
SPI CLK
31
SDIO D0 /
SPI MISO
32
SDIO CMD
/ SPI MOSI
33
Ground Paddle
25
Ground
Add plenty of ground
vias for thermal
dissipation and ground
return
Boot loader
BOOT0
I
2
Boot loader
(5)
1.
The activation of ALT function depends upon the firmware version or upon the variable configuration.
2.
To perform the factory reset of the variables, pin GPIO0 must be high during powerup.
3.
GPIO function running when low power mode variable is enabled.
4.
Introduced with the release 3.0 of AT Full stack. To enable the STAToMiniAP switch the GPIO[7] needs to be put low
together with the HW reset
8/18 DocID025635 Rev 7