AT86RF231-ZUR Atmel, AT86RF231-ZUR Datasheet - Page 142

• Manufacturer Part Number: AT86RF231-ZUR
• Description: IC RADIO TXRX 2.4GHZ 32-VQFN
• Manufacturer: Atmel

Specifications of AT86RF231-ZUR

• Frequency: 2.4GHz
• Data Rate - Maximum: 2Mbps
• Modulation Or Protocol: 802.15.4 Zigbee, 6LoWPAN, RF4CE, SP100, WirelessHART™, ISM
• Applications: Industrial Monitoring and Control, Wireless Alarm and Security Systems
• Power - Output: -17dBm ~ 3dBm
• Sensitivity: -101dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 12.3mA
• Current - Transmitting: 14mA
• 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: 2405 MHz to 2480 MHz
• Interface Type: SPI
• Noise Figure: 6 dB
• Output Power: 20 dB
• Operating Supply Voltage: 2.5 V, 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Supply Current: 12.3 mA
• Minimum Operating Temperature: - 40 C
• Modulation: OQPSK
• Protocol Supported: 802.15.4
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

11.4
11.4.1
11.4.2
8111C–MCU Wireless–09/09
Antenna Diversity
Overview
Antenna Diversity Application Example
The Antenna Diversity implementation is characterized by:
Due to multipath propagation effects between network nodes, the receive signal strength may
vary and affect the link quality, even for small changes of the antenna location. These fading
effects can result in an increased error floor or loss of the connection between devices.
To improve the reliability of an RF connection between network nodes Antenna Diversity can be
applied to reduce effects of multipath propagation and fading. Antenna Diversity uses two anten-
nas to select the most reliable RF signal path. This is done by the radio transceiver during
preamble field search without the need for microcontroller interaction. To ensure highly indepen-
dent receive signals on both antennas, the antennas should be carefully separated from each
other.
If a preamble field is detected on one antenna, this antenna is selected for reception. Otherwise
the search is continued on the other antenna and vice versa.
Antenna Diversity can be used in Basic and Extended Operating Modes and can also be com-
bined with other features and operating modes like High Data Rate Mode and RX/TX Indication.
A block diagram for an application using an antenna switch is shown in
142.
Figure 11-10. Antenna Diversity - Block Diagram
• Improves signal path robustness between nodes
• AT86RF231 self-contained antenna diversity algorithm
• Direct register based antenna selection
ANT0
ANT1
SW1
B1
1
2
3
4
5
6
AVSS
DIG4
RFP
RFN
AVSS
...
DIG3
9
AT86RF231
10
Figure 11-10 on page
AT86RF231
142