CC2550_13 Datasheet, PDF (9/61 Pages) Texas Instruments – Low-Cost Low-Power 2.4 GHz RF Transmitter

5 Pin Configuration
16 15 14 13
SCLK 1
SO (GDO1) 2
DVDD 3
DCOUPL 4
5678
12 AVDD
11 RF_N
10 RF_P
9 CSn
GND
Exposed die
attach pad
CC2550
Figure 1: Pinout Top View
Note: The exposed die attach pad must be connected to a solid ground plane as this is the main
ground connection for the chip.
Pin # Pin Name
1 SCLK
2 SO (GDO1)
3 DVDD
4 DCOUPL
5 XOSC_Q1
6 AVDD
7 XOSC_Q2
8 GDO0
(ATEST)
9 CSn
10 RF_P
11 RF_N
12 AVDD
13 AVDD
14 RBIAS
15 DGUARD
16 SI
Pin Type
Digital Input
Digital Output
Power (Digital)
Power (Digital)
Analog I/O
Power (Analog)
Analog I/O
Digital I/O
Digital Input
RF Output
RF Output
Power (Analog)
Power (Analog)
Analog I/O
Power (Digital)
Digital Input
Description
Serial configuration interface, clock input
Serial configuration interface, data output.
Optional general output pin when CSn is high
1.8 - 3.6 V digital power supply for digital I/O’s and for the digital core
voltage regulator
1.6 - 2.0 V digital power supply output for decoupling.
NOTE: This pin is intended for use with the CC2550 only. It can not be
used to provide supply voltage to other devices.
Crystal oscillator pin 1, or external clock input
1.8 - 3.6 V analog power supply connection
Crystal oscillator pin 2
Digital output pin for general use:
• Test signals
• FIFO status signals
• Clock output, down-divided from XOSC
• Serial input TX data
Also used as analog test I/O for prototype/production testing
Serial configuration interface, chip select
Positive RF output signal from PA
Negative RF output signal from PA
1.8 - 3.6 V analog power supply connection
1.8 - 3.6 V analog power supply connection
External bias resistor for reference current
Power supply connection for digital noise isolation
Serial configuration interface, data input
Table 11: Pinout Overview
SWRS039B
Page 9 of 58