ATmega1284PR231 Atmel Corporation, ATmega1284PR231 Datasheet - Page 92
ATmega1284PR231
Manufacturer Part Number
ATmega1284PR231
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT86RF231.pdf
(198 pages)
2.ATMEGA1284PR231.pdf
(380 pages)
3.ATMEGA1284PR231.pdf
(20 pages)
Specifications of ATmega1284PR231
Flash (kbytes)
128 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)
16
Eeprom (bytes)
4096
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
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8.4.3
8.4.4
8111C–MCU Wireless–09/09
Data Interpretation
Interrupt Handling
The PHY_ED_LEVEL is an 8-bit register. The ED value of the AT86RF231 has a valid range
from 0x00 to 0x54 with a resolution of 1 dB. All other values do not occur; a value of 0xFF indi-
cates the reset value. A value of PHY_ED_LEVEL = 0 indicates that the measured energy is
less than -91 dBm (see parameter 12.7.16 RSSI_BASE_VAL,
teristics” on page
parameters, etc.) the calculated ED value has a maximum tolerance of ±5 dB, this is to be con-
sidered as constant offset over the measurement range.
An ED value of 0 indicates an RF input power of P
0 to 84, the RF input power can be calculated as follows:
Figure 8-5.
Interrupt IRQ_4 (CCA_ED_DONE) is issued at the end of a manually initiated ED measurement.
Note that an ED request should only be initiated in receive states. Otherwise the radio trans-
ceiver generates an IRQ_4 (CCA_ED_DONE); however no ED measurement was performed.
-100
-10
-20
-30
-40
-50
-60
-70
-80
-90
P
10
RF
0
0
= -91 + ED [dBm]
Mapping between Received Input Power and ED Value
160). Due to environmental conditions (temperature, voltage, semiconductor
10
Measured
Ideal
20
PHY_ED_LEVEL (register 0x07)
30
40
RF
≤ -91 dBm. For an ED value in the range of
50
Section 12.7 “Receiver Charac-
60
70
AT86RF231
80
90
92
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