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

9.5.5.2 Configuration and CCA Request
9.5.5.3 Data Interpretation
9.5.5.4 Interrupt Handling
8266A-MCU Wireless-12/09
The CCA modes are configurable via register PHY_CC_CCA.
Usimg the Basic Operating Mode, a CCA request can be initiated manually by setting
CCA_REQUEST = 1 of register PHY_CC_CCA, if the radio transceiver is in any RX
state. The current channel status (CCA_STATUS) and the CCA completion status
(CCA_DONE) are accessible in register TRX_STATUS.
The CCA evaluation is done over eight symbol periods and the result is accessible
t
The
TRX24_CCA_ED_DONE interrupt.
The sub-register CCA_ED_THRES of register CCA_THRES defines the received power
threshold of the “energy above threshold” algorithm. The threshold is calculated by
RSSI_BASE_VAL + 2 • CCA_ED_THRES [dBm]. Any received power above this level
is interpreted as a busy channel.
Note that it is not recommended to manually initiate a CCA measurement when using
the Extended Operating Mode.
The current channel status (CCA_STATUS) and the CCA completion status
(CCA_DONE) are accessible in register TRX_STATUS. Note, register bits CCA_DONE
and CCA_STATUS are cleared in response to a CCA_REQUEST.
The completion of a measurement cycle is indicated by CCA_DONE = 1. If the radio
transceiver detected no signal (idle channel) during the measurement cycle, the
CCA_STATUS bit is set to 1.
When using the “energy above threshold” algorithm, any received power above
CCA_ED_THRES level is interpreted as a busy channel. The “carrier sense” algorithm
reports a busy channel when detecting an IEEE 802.15.4 signal above the
RSSI_BASE_VAL (see parameter RSSI_BASE_VAL in
Characteristics" on page
this value, but the detection probability decreases with the signal power.
The TRX24_CCA_ED_DONE interrupt is issued at the end of a manually initiated CCA
measurement.
TR28
CCA Mode
Note:
= 140 µs (128 µs measurement duration and processing delay) after the request.
0, 3
end
A CCA request should only be initiated in the receive states of Basic Operating Mode.
Otherwise the radio transceiver generates a TRX24_CCA_ED_DONE interrupt and
sets the register bit CCA_DONE = 1 even if no CCA measurement was performed.
of
Description
Carrier sense with energy above threshold.
CCA shall report a busy medium using a logical combination of
-
-
Where the logical operator may be configured as either OR (mode 0) or
AND (mode 3).
a
Detection of a signal with the modulation and spreading characteristics of
this standard and
Energy above the ED threshold.
manually
507). The radio transceiver is also able to detect signals below
initiated
CCA
measurement
ATmega128RFA1
"Transceiver Electrical
is
indicated
by
71
a