ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 69

• 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

9.5.4.2 Measurement Description
9.5.4.3 Data Interpretation
8266A-MCU Wireless-12/09
For High Data Rate Modes the automated ED measurement duration is reduced to
32 µs as described in
these modes is still 128 µs for manually initiated ED measurements as long as the
receiver is in RX_ON state.
There are two ways to initiate an ED measurement:
• Manually, by writing an arbitrary value to register PHY_ED_LEVEL, or
• Automatically, after detection of a valid SHR of an incoming frame.
For manually initiated ED measurements the radio transceiver needs to be in one of the
states RX_ON or BUSY_RX. The end of the ED measurement is indicated by a
TRX24_CCA_ED_DONE interrupt.
The automatic ED measurement is started if a SHR is detected. The end of the
automatic measurement is not signaled by an interrupt.
The measurement result is stored after t
and processing delay) in register PHY_ED_LEVEL.
Thus by using Basic Operating Mode a valid ED value from the currently received frame
is accessible 108 µs after the TRX24_RX_START interrupt and remains valid until the
next incoming frame generates a new TRX24_RX_START interrupt or until another ED
measurement is initiated.
When using the Extended Operating Mode it is recommended to mask the
TRX24_RX_START interrupt. Hence the interrupt cannot be used as timing reference.
A successful frame reception is signalized by the TRX24_RX_END interrupt. The
minimum time span between a TRX24_RX_END interrupt and a following SFD
detection is t
within 224 µs including the ED measurement time after the TRX24_RX_END interrupt.
Otherwise it could be overwritten by the result of the next measurement cycle. This is
important for time critical applications or if the TRX24_RX_START interrupt is not used
to indicate the reception of a frame.
The values of the register PHY_ED_LEVEL are:
Table 9-20. Register Bit PHY_ED_LEVEL Interpretation
The PHY_ED_LEVEL is an 8-bit register. The ED value of the radio transceiver has a
valid range from 0x00 to 0x54 with a resolution of 1 dB. All other values do not occur. A
value of 0xFF indicates the reset value. A value of PHY_ED_LEVEL = 0 indicates that
the measured energy is less than -90 dBm (see parameter RSSI_BASE_VAL in section
"Receiver Characteristics" on page
voltage, semiconductor parameters etc.) the calculated ED value has a maximum
tolerance of ±5 dB, this is to be considered as constant offset over the measurement
range.
An ED value of 0 indicates an RF input power of P
range of 0 to 84, the RF input power can be calculated as follows:
PHY_ED_LEVEL
Note:
0x00 … 0x54
0xFF
1. It is not recommended to manually initiate an ED measurement when using the
Extended Operating Mode.
TR27
= 96 µs due to the length of the SHR. The ED value needs to be read
Description
Reset value
ED measurement result of the last ED measurement
"High Data Rate Modes" on page
508). Due to environmental conditions (temperature,
TR26
= 140 µs (128 µs measurement duration
RF
ATmega128RFA1
-90 dBm. For an ED value in the
86. The measurement period in
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