AT86RF212-ZU Atmel, AT86RF212-ZU Datasheet - Page 80

• 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

6.4 Received Signal Strength Indicator (RSSI)
6.4.1 Overview
6.4.2 Reading RSSI
6.4.3 Data Interpretation
80
AT86RF212
The Received Signal Strength Indicator is characterized by:
• a dynamic range of 87 dB
• a resolution of about 3 dB
The RSSI value indicates the received signal power in the selected channel. No attempt
is made to distinguish IEEE 802.15.4 signals from others; only the received signal
strength is evaluated. The RSSI provides the basis for an ED measurement, see
section 6.5.
In Basic Operating Modes, the RSSI value is valid in any receive state and is updated
at time intervals according to Table 6-24. The current RSSI value can be accessed by
reading register bits RSSI of register 0x06 (PHY_RSSI).
Table 6-24. RSSI Update Interval
It is not recommended reading the RSSI value when using the Extended Operating
Modes. Instead, the automatically generated ED value should be used, see section 6.5.
The RSSI value is a 5-bit value in a range of 0 to 28, indicating the receiver input power
in steps of about 3 dB.
A RSSI value of 0 indicates a receiver input power less than or equal to
RSSI_BASE_VAL [dBm], a value of 28 an input power equal to or larger than
(RSSI_BASE_VAL + 87) [dBm]. The value RSSI_BASE_VAL itself depends on the PHY
mode, refer to section 7.1. For typical conditions, it is shown in Table 6-25.
Table 6-25. RSSI_BASE_VAL
The receiver input power can be calculated as follows:
PHY Mode
BPSK-20
BPSK-40
O-QPSK
PHY Mode
BPSK with 300 kchip/s
BPSK with 600 kchip/s
O-QPSK with 400 kchip/s
O-QPSK with 1000 kchip/s, sine shaping (SIN)
O-QPSK with 1000 kchip/s, raised cosine shaping (RC-0.8)
P
RF
[dBm] = RSSI_BASE_VAL + 3.1 ⋅ RSSI
Update Interval [µs]
RSSI_BASE_VAL [dBm]
32
24
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8168C-MCU Wireless-02/10
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