1

SCLK

Serial   configuration interface, clock input

2

SO (GDO1)

Serial   configuration interface, data output. Optional general output pin   when   CSn is high

3

GDO2

Digital output   pin for general use:Test signals/FIFO status   signals/Clear channel   indicator/Clock output, down-divided from XOSC/Serial   output RX data

4

DVDD

1.8 - 3.6 V   digital power supply for digital I/O’s and for the   digital core voltage regulator.

5

DCOUPL

1.6 - 2.0 V   digital power supply output for decoupling.NOTE: This pin is   intended   for use with the CC1101  only.   It can not be used to provide   supply voltage to other devices.

6

GDO0(ATEST)

Digital output   pin for general use:Test signals/FIFO status   signals/Clear channel   indicator/Clock output, down-divided from XOSC/Serial   output RX data   /Serial input TX data/Serial output RX data.Also used as   analog test   I/O for prototype/production testing

7

CSn

Serial   configuration interface, chip select

8

XOSC_Q1

Crystal   oscillator pin 1, or external clock input

9

AVDD

1.8 - 3.6 V   analog power supply connection

10

XOSC_Q2

Crystal   oscillator pin 2

11

AVDD

1.8  - 3.6   V analog power supply   connection

12

RF_P

Positive RF   input signal to LNA in receive mode.Positive RF output   signal from PA   in transmit mode

13

RF_N

Negative RF   input signal to LNA in receive mode.Negative RF output   signal from PA   in transmit mode

14

AVDD

1.8 - 3.6 V   analog power supply connection

15

AVDD

1.8 - 3.6 V   analog power supply connection

16

GND

Analog ground   connection

17

RBIAS

External bias   resistor for reference current

18

DGUARD

Power supply   connection for digital noise isolation

19

GND

Ground connection   for digital noise isolation

20

SI

Serial   configuration interface, data input