AX−SFUS, AX−SFUS−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 receive input

ANTN

4

A

Differential receive input

ANTP1

5

N

Single ended transmit output

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 dock

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

RX_LED

24

O

Receive activity indicator

TX_LED

25

O

Transmit activity indicator

NC

26

PD

Do not connect

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

TX_EN

32

O

Transmitter Enable (to frontend)

NC

33

N

Do not connect

NC

34

N

Do not connect

RX_EN

35

O

Receiver Enable (to frontend)

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

CLKN

39

A

TCXO interface