ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 71

• Manufacturer Part Number: ATMEGA128RFA1-ZU
• Description: IC AVR MCU 2.4GHZ XCEIVER 64QFN
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA128RFA1-ZU

• Frequency: 2.4GHz
• Data Rate - Maximum: 2Mbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: General Purpose
• Power - Output: 3.5dBm
• Sensitivity: -100dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 12.5mA
• Current - Transmitting: 14.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 128kB Flash, 4kB EEPROM, 16kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VFQFN, Exposed Pad
• Rf Ic Case Style: QFN
• No. Of Pins: 64
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Processor Series: ATMEGA128x
• Core: AVR8
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 128 KB
• Data Ram Size: 16 KB
• Interface Type: JTAG
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 6
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVR128RFA1-EK1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.5.4.4 Interrupt Handling
9.5.5 Clear Channel Assessment (CCA)
9.5.5.1 Overview
8266B-MCU Wireless-03/11
Figure 9-18. Mapping between values in PHY_ED_LEVEL and Received Input Power
The TRX24_CCA_ED_DONE interrupt is issued at the end of a manually initiated ED
measurement.
Note that an ED request should only be initiated in one of the receive states. Otherwise
the radio transceiver generates a TRX24_CCA_ED_DONE interrupt but no ED
measurement was performed.
The main features of the Clear Channel Assessment (CCA) module are:
• All 4 modes are available as defined by IEEE 802.15.4-2006 in section 6.9.9;
• Adjustable threshold for energy detection algorithm.
A CCA measurement is used to detect a clear channel. Four modes are specified by
IEEE 802.15.4-2006:
Table 9-21. CCA Mode Overview
CCA Mode
-100
-10
-20
-30
-40
-50
-60
-70
-80
-90
10
1
2
0
P
0
RF
= -90 + ED [dBm]
Description
Energy above threshold.
CCA shall report a busy medium upon detecting any energy above the ED
threshold.
Carrier sense only.
CCA shall report a busy medium only upon the detection of a signal with the
modulation and spreading characteristics of an IEEE 802.15.4 compliant signal.
The signal strength may be above or below the ED threshold.
10
Measured
Ideal
20
Register PHY_ED_LEVEL Value
30
40
50
ATmega128RFA1
60
70
80
90
71