DocID025635 Rev 6

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SPWF01SA, SPWF01SC

Pinout description

16

GPIO[14]

I/O

14

LED Drive, Power

Up

UART Pins

RXD1

I

8

UART1 Receive

data input

5V tolerant

TXD1

O

6

UART1 Transmit

data output

5V Tolerant

CTS1_DN

I

9

UART1 Clear To

Send input

Active Low, 5V

Tolerant

RTS1_DP

O

10

UART1 Request to

send output

Active Low, 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

Ground Paddle

25

Ground

Add plenty of ground

vias for thermal

dissipation and ground

return

Boot loader

BOOT0

I

2

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

5.

To enable the firmware download, pin BOOT0 needs to be high during power up. RESETn need to be pulled low at least 5

ms to initiate the firmware download sequence.

PIN 26 to PIN 30 are Reserved and they can be left floating in the final design

Application tip

As a general rule, when commutation issues occur, a level translator should be used to match the I/O

pins voltage of the connected device.

The HOST processor should control the RESETn pin of the module in order to recover unexpected

behaviors using the HW reset.

Table 5. Pinout description (continued)

Signal Name

Type

PIN Number

Main function

Alternate

Notes