User's Manual

User Manual

10/17 DocID-xx

Table 5. S2-LP interface (optional) with Nucleo board

S2-LP signal

Default STM32

port

Optional STM32 port

CSn

PA1

PB6

To use optional connection mount R9, demount R13

CLK

PB3

PA5

To use optional connection mount R6, demount R11

PB4

PA9

To use optional connection mount R7, demount R19

SDN

PA8

PB10

To use optional connection mount R18, demount R10

To use the optional connections, modify the firmware on the basis of the

STM32 resources used.

SKY66420 power amplifier setting:

SW1

SW2

LNA ON

soldered a 100 pF cap between 1 – 2

soldered a 100 pF cap between 1 - 3

LNA OFF

soldered a 100 pF cap between 1 - 3

soldered a 100 pF cap between 1 - 2

SKY66420

signal

Default STM32 port

Optional STM32 port

GPIO0

PA0

PC1

To use optional connection mount R25,

demount R12

GPIO1

PA4

GPIO2

PB0