Texas Instruments Chipcon CC2420DK Manuale utente

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User Manual

Rev. 1.0

CC2420DK Development Kit

This datasheet has been downloaded fromhttp://www.digchip.com at this page

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Table of contents

INTRODUCTION ....................................................................................................................... 3

CC2420 EVALUATION MODULE ............................................................................................ 4

CIRCUIT DESCRIPTION .............................................................................................................. 4

PCB LAYOUT,CC2420EM....................................................................................................... 4

SCHEMATIC,CC2420EM ......................................................................................................... 8

BILL OF MATERIALS,CC2420EM .............................................................................................. 9

CC2400 EVALUATION BOARD............................................................................................. 10

POWER SUPPLY SECTION ........................................................................................................ 10

USB INTERFACE..................................................................................................................... 12

RS-232 INTERFACE................................................................................................................ 12

JUMPERS ............................................................................................................................... 12

MICROCONTROLLER AND FPGA.............................................................................................. 13

CONNECTORS ........................................................................................................................ 14

PCB LAYOUT,CC2400EB...................................................................................................... 15

SCHEMATICS,CC2400EB...................................................................................................... 18

BILL OF MATERIALS,CC2400EB ............................................................................................ 23

USING THE DEVELOPMENT KIT.......................................................................................... 29

CC2420 RF EVALUATION USING SMARTRF®STUDIO OR PACKET SNIFFER ............................... 29

USING THE CC2420DK FOR PROTOTYPING ............................................................................. 30

TROUBLESHOOTING ............................................................................................................ 31

IT DOES NOT WORK................................................................................................................. 31

SMARTRF®STUDIO DOES NOT RECOGNIZE THE CC2400EB .................................................... 31

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Introduction

The CC2420 is a true single-chip 2.4 GHz IEEE 802.15.4 compliant RF transceiver designed

for low-power and low-voltage wireless applications. The CC2420DK development kit is a

powerful and flexible tool specifically designed to make it easy for the user to evaluate the RF

performance of the CC2420 and to minimize the time spent on evaluation.

The Development Kit includes two CC2400EB Evaluation Boards and two CC2420EM

Evaluation Modules. The Evaluation Modules contain the CC2420 chip and required external

components.

The Evaluation Board serves as a motherboard for the Evaluation Modules. The Evaluation

Board provides a USB port, a serial port, buttons, LEDs, voltage regulator, configuration

jumpers and connectors to make it easy to interface the CC2420 with the SmartRF®Studio

software and various test equipment. The CC2400EB Evaluation Board is the same as for the

CC2400DK.

This User Manual describes how to use the Development Kit. SmartRF®Studio is

documented in its own user manual.

Your SmartRF®CC2420DK Development Kit should contain the following items:

Kit contents

Item Number of articles

Evaluation Board (CC2400EB) 2

Evaluation Module (CC2420EM) 2

Quick Start instructions 1

Antenna, 50Ωquarter-wave monopole, SMA male connector 2

SMA to BNC adapters 4

USB cable 2

CC2420 sample kit 1

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CC2420 Evaluation Module

The CC2420EM Evaluation Module contains the CC2420 chip together with the external

circuitry needed for proper operation. Not all components are needed in an actual application.

Please see the data sheet for a typical application circuit.

The CC2420 operates in the 2.4 GHz frequency band. Although this frequency band is

usually described as “world-wide”, some countries do not allow unlicensed operation in this

band.

Important: Contact your local telecommunication authorities before transmitting an RF signal.

Circuit description

The CC2420 RF section includes all the necessary components for correct operation.

The CC2420 is connected to a 16 MHz crystal.

The user can select between using the CC2420 on chip voltage regulator, or the regulator on

the CC2400EB. This is controlled by the jumper on CC2420EM. The default setting is to use

the CC2400EB regulator. If the internal regulator is selected, you must also change the

CC2400EB P12 jumper setting as given in figure 9.

The CC2420EM Evaluation Module can be plugged into the CC2400B Evaluation Board. Two

2x10 pin pin row connectors with 0.050-inch pitch are used for this purpose.

Figure 1: CC2420EM Evaluation Module

PCB layout, CC2420EM

RF circuits operating at high frequencies are sensitive to the physical layout of the PCB.

Chipcon has carefully optimized the layout of the CC2420EM Evaluation Module and we

therefore recommend that the user copies it when making own PCB designs.

The PCB is of a 4-layer type in order to provide a well-defined ground plane as well as

adequate routing space. The laminate used is standard FR-4 board material. The PCB is

1.0mm thick, with layer 1 on the top side, layers 2 and 3 are internal layers and layer 4 is on

the bottom side. Layers 1 and 4 are used for routing, and layer 3 is used for power routing. All

areas not utilized for routing are filled with copper connected to ground to provide RF

shielding. The ground planes on all layers are stitched together with closely spaced vias.

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Figure 2: CC2420EM PCB layout, layer 1

Figure 3: CC2420EM PCB layout, layer 2

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Figure 4: CC2420 PCB layout, layer 3

Figure 5: CC2420EM PCB layout, layer 4

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Figure 6a: CC2420EM component placement, top side

Figure 6b: CC2420EM component placement, bottom side

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Schematic, CC2420EM

Figure 7: CC2420EM schematic

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Bill of materials, CC2420EM

Reference Description Value Part

C1 Capacitor 0603 2.2 µF, 10% C_2U2_0603_X5R_K_10

C11 Capacitor 0402 100 nF, 10% C_100N_0402_X5R_J_10

C61 Capacitor 0402 0.5 pF, ± 0.25 pF C_0P5_0402_NP0_C_50

C62 Capacitor 0402 5.6 pF, ± 0.25 pF C_5P6_0402_NP0_C_50

C71 Capacitor 0402 5.6 pF, ± 0.25 pF C_5P6_0402_NP0_C_50

C81 Capacitor 0402 0.5 pF, ± 0.25 pF C_0P5_0402_NP0_C_50

C101 Capacitor 0402 10 nF, 10% C_10N_0402_X7R_K_25

C171 Capacitor 0402 68 pF, 5% C_68P_0402_NP0_J_50

C251 Capacitor 0402 100 nF, 10% C_100N_0402_X5R_K_10

C261 Capacitor 0402 100 nF, 10% C_100N_0402_X5R_K_10

C351 Capacitor 0402 100 nF, 10% C_100N_0402_X5R_K_10

C371 Capacitor 0402 68 pF, 5% C_68P_0402_NP0_J_50

C381 Capacitor 0402 22 pF, 5% C_22P_0402_NP0_J_50

C391 Capacitor 0402 22 pF, 5% C_22P_0402_NP0_J_50

C421 Capasitor 0805 10 uF, 15% C_10U_0805_X5R_L_25

C431 Capasitor 0805 10 uF, 15% C_10U_0805_X5R_L_25

C441 Capacitor 0402 68 pF, 5% C_68P_0402_NP0_J_50

L61 Inductor 0402 7.5 nH, 5% L_7N5_0402_J

L62 Inductor 0402 5.6 nH, 5% L_5N6_0402_J

L81 Inductor 0402 7.5 nH, 5% L_7N5_0402_J

P1 SMD pinrow socket SMD_SOCKET_2x10 (Samtec

SFM-110-02-S-D-A-K-TR)

P2 SMD pinrow socket SMD_SOCKET_2x10 (Samtec

SFM-110-02-S-D-A-K-TR)

P3 3 pin jumper 3 pin connector, 0.9 mm pin

P4 Surface-mount

SMA, straight

SMA_SMD

R1 Resistor 0603 0 ΩR_0_0603

R2 Resistor 0603 0 ΩR_0_0603

R421 Resistor 0402 2 Ω, 1% R2R0_0402_F

R451 Resistor 0402 43 kΩ, 1% R_43K_0402_F

U1 Single-chip

transceiver

CC2420

X1 Crystal, ceramic

SMD 4x25mm

X_16.000/10/10/10/16 (Toyocom

TSX-10A 16M 16pF)

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Note: The crystal X1 mounted on the EM board is a 16.000 MHz crystal, with ±10 ppm initial

tolerance, ± 10 ppm drift over temperature and a temperature range of -10˚C to +60˚C. The

crystal is designed for 16 pF load capacitance. In an actual application, the tolerance, drift

and temperature range of the crystal must be considered with application requirements in

mind. Please consult the data sheet and SmartRF®Studio for more information. It is possible

to choose a larger crystal package to save cost. The crystal should have an ESR of 60 Ωor

less.

CC2400 Evaluation Board

The Evaluation Board is used as a motherboard for the Evaluation Modules and provides

power and external connections.

Figure 7: CC2400EB Evaluation Board

Power supply section

The power supply section is configured by moving the jumpers located on the board. There

are three voltage regulators on the board, one for use by the FPGA, a 3.3 V regulator for

general use and a 1.8 V regulator for powering the CC2420. The voltage regulator for the

USB port

Serial port

Power

connections

Sockets for EM

Buttons

LEDs

SMA connectors

Test port

Reset button

Jumpers

DC jack

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