RC220x

©2005 Radiocrafts AS

RC220x Data Sheet (rev. 1.0)

Page 6 of 17

Block Diagram

IEEE 802.15.4

MAC

8-bit MCU

IEEE 802.15.4

RF Transceiver

Network

User

Application

Integrated

antenna

or

RF connector

(optional)

Digital/Analogue I/O

UART interface

SPI interface

2.7-3.6 V

Embedded resources

MCU: Atmel mega128L, mega64L or mega325

PHY/MAC: Chipcon CC2420

Chipcon / Figure 8 Wireless Z-stack royalty fee included

Circuit Description

The module contains a micro controller unit (MCU) and an IEEE 802.14.4 compliant RF

transceiver with internal voltage regulator. The module is intended for running the ZigBee

network protocol.

The application software together with the ZigBee protocol software stack can be

programmed in Flash memory through JTAG or ISP interfaces. The JTAG interface can also

be used for debugging. The MCU runs at 8 MHz and contains on-chip RAM and non-volatile

EEPROM memory.

The MCU controls the RF transceiver through an SPI interface and hardware handshake

signals. The firmware controlling the RF transceiver is part of the MAC software. The antenna

output is internally matched to 50 Ohms, optionally using an integrated antenna.

The supply voltage is connected to the VCC pin. The module contains an internal low noise

voltage regulator for the RF transceiver, and can therefore operate over a wide supply voltage

range. The regulated voltage is available at the 1.8V pin (pin 29), but should not be used to

supply external circuits except for connection to AREF, being a reference for the internal A/D

converter.

The module provides 2 UART interfaces, SPI interface, JTAG interface. Totally 32 I/O pins

are available to the user. 8 pins can be used for the internal 10 bit A/D converter. 6 of the

digital I/Os have interrupt features.

The MCU provides several low power modes with can be utilized to reduce the current

consumption in battery operated applications. An internal 32 kHz crystal oscillator can be

used for real-time clock and timer applications.

For further details on the RF transceiver (Chipcon CC2420) and MCU (Atmel mega128L,

mega64L or mega325), please consult the respective data sheets.