AT86RF212-ZU Atmel, AT86RF212-ZU Datasheet - Page 89

• 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

6.7.2 LBT Mode
6.7.3 Register Description
8168C-MCU Wireless-02/10
LBT Threshold
According to [5], the maximum LBT threshold for an IEEE 802.15.4 signal is
presumably -82 dBm, assuming a channel spacing of 1 MHz.
The AT86RF212 supports the previously described LBT specific listening mode when
operating in the Extended Operating Mode.
In particular, during TX_ARET (see section 5.2.4), the CSMA-CA algorithm can be
replaced by the LBT listening mode when setting register bit CSMA_LBT_MODE
(register
MAX_CSMA_RETRIES (register 0x2C, XAH_CTRL_0) as well as MIN_BE and
MAX_BE (register 0x2F, CSMA_BE) are ignored, implying that the listening mode will
sustain unless a clear channel has been found or the TX_ARET transaction will be
canceled. The latter can be achieved by setting TRX_CMD to either FORCE_PLL_ON
or FORCE_TRX_OFF (register 0x02, TRX_STATE). All other aspects of TX_ARET
remain unchanged, refer to section 5.2.4.
The LBT threshold can be configured in the same way as for CCA, i.e. via register bits
CCA_MODE (register 0x08, PHY_CC_CCA) and register bits CCA_ED_THRES
(register 0x09, CCA_THRES), refer to section 6.6.
Register 0x08 (PHY_CC_CCA):
This register is relevant for the measurement mode when using LBT, i.e. selecting
“energy above threshold” or “carrier sense” (CS) or combination of both.
Table 6-36. Register 0x08 (PHY_CC_CCA)
• Bit 7 – CCA_REQUEST
Not applicable for LBT, see section 6.6.6.
• Bit 6:5 – CCA_MODE
The CCA mode can be used in order to select the appropriate LBT measurement mode
by using register bits CCA_MODE, refer to section 6.6.
• Bit 4:0 – CHANNEL
Refer to section 7.8.6.
Bit
Name
Read/Write
Reset Value
Bit
Name
Read/Write
Reset Value
0x17,
7
CCA_REQUEST
W
0
3
CHANNEL[3]
R/W
0
XAH_CTRL_1).
6
CCA_MODE[1]
R/W
0
2
CHANNEL[2]
R/W
1
In
this
case,
5
CCA_MODE[0]
R/W
1
1
CHANNEL[1]
R/W
0
however,
AT86RF212
the
4
CHANNEL[4]
R/W
0
0
CHANNEL[0]
R/W
1
register
bits
89