AT86RF212-ZU Atmel, AT86RF212-ZU Datasheet - Page 84

• Manufacturer Part Number: AT86RF212-ZU
• Description: IC TXRX ZIGBE/802.15.4/ISM 32QFN
• Manufacturer: Atmel

Specifications of AT86RF212-ZU

• Frequency: 700MHz, 800MHz, 900MHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4 Zigbee, 6LoWPAN, ISM
• Applications: ISM, ZigBee™
• Power - Output: 10dBm
• Sensitivity: -110dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 9.2mA
• Current - Transmitting: 25mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Number Of Receivers: 1
• Number Of Transmitters: 1
• Wireless Frequency: 769 MHz to 935 MHz
• Interface Type: SPI
• Noise Figure: 7 dB
• Output Power: 21 dB
• Operating Supply Voltage: 1.8 V, 3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Supply Current: 25 mA
• Minimum Operating Temperature: - 40 C
• Modulation: OQPSK
• Protocol Supported: 802.15.4
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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