AX−SFEU, AX−SFEU−API

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3

Table 1. PIN FUNCTION DESCRIPTIONS

Symbol

Pin(s)

Type

Description

VDD_ANA

1

P

Analog power output, decouple to neighboring GND

GND

2

P

Ground, decouple to neighboring VDD_ANA

ANTP

3

A

Differential antenna input/output

ANTN

4

A

Differential antenna input/output

NC

5

N

Do not connect

GND

6

P

Ground, decouple to neighboring VDD_ANA

VDD_ANA

7

P

Analog power output, decouple to neighboring GND

GND

8

P

Ground

FILT

9

A

Synthesizer filter

L2

10

A

Must be connected to pin L1

L1

11

A

Must be connected to pin L2

NC

12

N

Do not connect

GPIO8

13

I/O/PU

General purpose IO

GPIO7

14

I/O/PU

General purpose IO, selectable SPI functionality (MISO)

GPIO6

15

I/O/PU

General purpose IO, selectable SPI functionality (MOSI)

GPIO5

16

I/O/PU

General purpose IO, selectable SPI functionality (SCK)

GPIO4

17

I/O/PU

General purpose IO, selectable SD DAC functionality, selectable clock

functionality

CPU_LED

18

O

CPU activity indicator

RADIO_LED

19

O

Radio activity indicator

VTCXO

20

O

TCXO power

GPIO9

21

I/O/PU

General purpose IO, wakeup from deep sleep

UARTTX

22

O

UART transmit

UARTRX

23

I/PU

UART receive

RXLED/

DBG_DATA

24

O

I/O

Receive activity indicator in AX−SFEU

Debugger data line in AX−SFEU−API

TXLED/

DBG_CLK

25

O

I

Transmit activity indicator in AX−SFEU

Debugger clock line in AX−SFEU−API

NC/

DBG_EN

26

PD

PD

Do not connect in AX−SFEU

Debugger enable line in AX−SFEU−API

RESET_N

27

I/PU

Optional reset pin. Internal pull−up resistor is permanently enabled, nevertheless

it is recommended to connect this pin to VDD_IO if it is not used

GND

28

P

Ground

VDD_IO

29

P

Unregulated power supply

GPIO0

30

I/O/A/PU

General purpose IO, selectable ADC functionality, selectable SD DAC

functionality, selectable clock functionality

GPIO1

31

I/O/A/PU

General purpose IO, selectable ADC functionality

GPIO2

32

I/O/A/PU

General purpose IO, selectable ADC functionality

NC

33

N

Do not connect

NC

34

N

Do not connect

GPIO3

35

I/O/A/PU

General purpose IO, selectable ADC functionality

VDD_IO

36

P

Unregulated power supply

CAL

37

A

Connect to FILT as shown in the application diagram

NC

38

N

Do not connect