ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 88

• 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

Figure 9-30. High Data Rate Frame Structure
9.8.2.3 High Data Rate Frame Buffer Access
9.8.2.4 High Data Rate Energy Detection
88
250 kb/s
500 kb/s
1000 kb/s
2000 kb/s
0
ATmega128RFA1
192
PSDU: 80 octets
PSDU: 80 octets
PSDU: 80 octets
PSDU: 80 octets
512
The effective data rate is smaller than the selected data rate due to the overhead
caused by the SHR, the PHR and the FCS. The overhead depends further on the
length of the PSDU. A graphical representation of the effective data rate is shown in the
following figure:
Figure 9-31. Effective Data Rate “B” for High Data Rate Mode
Therefore High Data Rate transmission and reception is useful for large PSDU lengths
due to the higher effective data rate or to reduce the power consumption of the system.
Furthermore the active on-air time using High Data Rate Modes is significantly reduced.
The Frame Buffer access to read or write frames for High Data Rate communication is
similar to the procedure described in
in the Frame Buffer after the PSDU data is the ED value rather than the LQI value.
According to IEEE 802.15.4 the ED measurement duration is 8 symbol periods. For
frames operated at higher data rates the automated ED measurement duration is
reduced to 32 µs to take the reduced frame length into account
(ED)" on page
1600
1400
1200
1000
832
800
600
400
200
0
0
69).
20
2000
1000
500
250
2000 kbps
1472
40
1000 kbps
"Frame Buffer" on page
PSDU length in octets
60
500 kbps
80
78. However the last byte
250 kbps
8266B-MCU Wireless-03/11
("Energy Detection
100
2752
time [µs]
120