ATmega644PR231 Atmel Corporation, ATmega644PR231 Datasheet - Page 137

• Manufacturer Part Number: ATmega644PR231
• Manufacturer: Atmel Corporation

Specifications of ATmega644PR231

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 20 MHz
• Max I/o Pins: 32
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Crypto Engine: AES
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Operating Voltage (vcc): 1.8 to 3.6
• Timers: 3
• Frequency Band: 2.4 GHz
• Max Data Rate (mb/s): 2
• Antenna Diversity: Yes
• External Pa Control: Yes
• Power Output (dbm): 3
• Receiver Sensitivity (dbm): -101
• Receive Current Consumption (ma): 13.2
• Transmit Current Consumption (ma): 14.4
• Link Budget (dbm): 104

11.3
11.3.1
11.3.2
8111C–MCU Wireless–09/09
High Data Rate Modes
Overview
High Data Rate Packet Structure
The main features are:
The AT86RF231 also supports alternative data rates, higher than 250 kb/s for applications
beyond IEEE 802.15.4 compliant networks.
The selection of a data rate does not affect the remaining functionality. Thus it is possible to run
all features and operating modes of the radio transceiver in various combinations.
The data rate can be selected by writing to register bits OQPSK_DATA_RATE (register 0x0C,
TRX_CTRL_2).
The High Data Rate Modes occupy the same RF channel bandwidth as the IEEE 802.15.4-
2.4 GHz 250 kb/s standard mode. Due to the decreased spreading factor, the sensitivity of the
receiver is reduced accordingly.
for different data rates.
Table 11-8.
By default there is no header based signaling of the data rate within a transmitted frame. Thus
nodes using a data rate other than the default IEEE 802.15.4 data rate of 250 kb/s are to be con-
figured in advance and consistently. Alternatively the configurable start of frame delimiter (SFD)
could be used as an indicator of the PHY data rate, see
Frame Delimiter” on page
In order to allow appropriate frame synchronization, higher data rate modulation is restricted to
the payload octets only. The SHR and the PHR field are transmitted with the IEEE 802.15.4
compliant data rate of 250 kb/s, refer to
on page
A comparison of the general packet structure for different data rates with an example PSDU
length of 80 octets is shown in
• High Data Rate Transmission up to 2 Mb/s.
• Support of Basic and Extended Operating Mode
• Support of other features of the Extended Feature Set
• Reduced ACK timing (optional)
High Data Rate
1000 kb/s
2000 kb/s
250 kb/s
500 kb/s
79.
High Data Rate Sensitivity
Sensitivity
-101 dBm
-97 dBm
-95 dBm
-89 dBm
155.
Figure 11-6 on page
Table 11-8 on page 137
Comment
PER ≤ 1%, PSDU length of 20 octets
PER ≤ 1%, PSDU length of 20 octets
PER ≤ 1%, PSDU length of 20 octets
PER ≤ 1%, PSDU length of 20 octets
Section 8.1.1 “PHY Protocol Layer Data Unit (PPDU)”
138.
shows typical values of the sensitivity
Section 11.9 “Configurable Start-Of-
AT86RF231
137