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AT86RF232
8.4.3 Data Interpretation
The PHY_ED_LEVEL is an 8-bit
register. The
ED_LEVEL
value of the
Atmel AT86RF232 has a valid range from 0x00 to 0x53 with a resolution of 1dB. A
value of 0xFF indicates the reset value. All other values do not occur.
Due to environmental conditions (temperature, voltage, semiconductor parameters,
etc.) the calculated ED_LEVEL value has a maximum tolerance of ±5dB, this is to be
considered as constant offset over the measurement range.
An ED_LEVEL value of zero indicates an RF input power of P RF ≤ -91dBm (see
parameter RSSI BASE_VAL , Section 12.7 ). For an ED_LEVEL value in the range of one to
83, the RF input power can be calculated as follows:
P RF [dBm] = RSSI BASE_VAL + ED_LEVEL
Figure 8-8. Mapping between Received Input Power and ED Value.
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
Measured
Ideal
0
10
20
30
40
50
60
70
80
90
PHY_ED_LEVEL (register 0x07)
8.4.4 Interrupt Handling
Interrupt IRQ_4 (CCA_ED_DONE) is issued at the end of a manually initiated ED
measurement.
Note:
1.
An ED request should only be initiated in receive states. Otherwise the radio
transceiver generates an
IRQ_4 (CCA_ED_DONE);
however no ED
measurement was performed.
91
8321A – MCU Wireless – 10/11
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