AT86RF212 Atmel Corporation, AT86RF212 Datasheet - Page 84

• Manufacturer Part Number: AT86RF212
• Manufacturer: Atmel Corporation

Specifications of AT86RF212

• Max. Operating Frequency: 0 MHz
• Crypto Engine: AES
• Operating Voltage (vcc): 1.8 to 3.6
• Frequency Band: 700/800/900MHz
• Max Data Rate (mb/s): 1
• Antenna Diversity: No
• External Pa Control: Yes
• Power Output (dbm): 10
• Receiver Sensitivity (dbm): -110
• Receive Current Consumption (ma): 9.0
• Transmit Current Consumption (ma): 18 at 5dBm
• Link Budget (dbm): 120

6.6 Clear Channel Assessment (CCA)
6.6.1 Overview
6.6.2 Configuration and Request
84
AT86RF212
Table 6-27. Register 0x07 (PHY_ED_LEVEL)
Bit 7:0 – ED_LEVEL
The measured ED value has a valid range from 0x00 to 0x54 (0 to 84). The value 0xFF
indicates that a measurement has never been started (reset value).
A manual ED measurement can be initiated by a write access to the register.
The main features of the Clear Channel Assessment (CCA) module are:
• All four CCA modes are provided as defined in IEEE 802.15.4-2006
• Adjustable threshold for energy detection algorithm
A CCA measurement is used to detect a clear channel. Four CCA modes are specified
by IEEE 802.15.4-2006:
Table 6-28. CCA Mode Overview
The CCA modes are configurable via register 0x08 (PHY_CC_CCA).
When being in Basic Operating Mode, a CCA request can be initiated manually by
setting CCA_REQUEST = 1 (register 0x08, PHY_CC_CCA) if the AT86RF212 is in any
RX state. The current channel status (CCA_STATUS) and the CCA completion status
(CCA_DONE) are accessible through register 0x01 (TRX_STATUS).
The end of a manually initiated CCA (8 symbol periods plus 12 µs processing delay) is
indicated by the interrupt IRQ_4 (CCA_ED_DONE).
Bit
Name
Read/Write
Reset Value
Note:
CCA Mode
0, 3
1
2
1. A write access is required for initiation of a manual ED measurement.
7
1
Description
Energy above threshold:
CCA shall report a busy medium upon detecting any energy above the ED
threshold.
Carrier sense only:
CCA shall report a busy medium only upon the detection of a signal with the
modulation and spreading characteristics of an IEEE 802.15.4 compliant signal.
The signal strength may be above or below the ED threshold.
Carrier sense with energy above threshold:
CCA shall report a busy medium using a logical combination of
-
-
where the logical operator may be configured as either OR (mode 0) or AND
(mode 3).
detection of a signal with the modulation and spreading characteristics of
this standard and/or
energy above the ED threshold,
6
1
5
1
4
1
ED_LEVEL[7:0]
R
(1)
3
1
2
1
8168C-MCU Wireless-02/10
1
1
0
1