MRF24J40-I/ML Microchip Technology, MRF24J40-I/ML Datasheet - Page 97

IC TXRX IEEE/ZIGBEE 2.4GHZ 40QFN

MRF24J40-I/ML

Manufacturer Part Number
MRF24J40-I/ML
Description
IC TXRX IEEE/ZIGBEE 2.4GHZ 40QFN
Manufacturer
Microchip Technology
Datasheets

Specifications of MRF24J40-I/ML

Package / Case
40-QFN
Frequency
2.4GHz
Data Rate - Maximum
250kbps
Modulation Or Protocol
802.15.4
Applications
ISM, ZigBee™
Power - Output
0dBm
Sensitivity
-95dBm
Voltage - Supply
2.4 V ~ 3.6 V
Current - Receiving
18mA
Current - Transmitting
18mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Operating Temperature
-40°C ~ 85°C
Number Of Receivers
1
Number Of Transmitters
1
Wireless Frequency
2.4 GHz
Interface Type
4 Wire SPI
Noise Figure
8 dB
Output Power
+ 0 dBm
Operating Supply Voltage
2.5 V, 3.3 V
Maximum Operating Temperature
85 C
Mounting Style
SMD/SMT
Maximum Supply Current
22 mA
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Memory Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MRF24J40-I/ML
Manufacturer:
MICROCHIP
Quantity:
12 000
Part Number:
MRF24J40-I/ML
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
3.7
Link Quality Indication (LQI) is a characterization of
strength or quality of a received packet. Several
metrics, for example, RSSI, Signal to Noise Ratio
(SNR), RSSI combined with SNR, etc., can be used for
measuring link quality. Using RSSI or SNR alone may
not be the best way to estimate the quality of a link. The
received RSSI value will be a very high value if a packet
is received with greater signal strength or even if an
interferer is present in the channel. Hence, for better
approximation of link quality, the MRF24J40 reports the
correlation degree between spreading sequences and
the incoming chips during the reception of a packet.
This correlation value is directly mapped to a range of
0-255 (256 values), where an LQI value of 0 indicates
that the quality of the link is very low, and an LQI value
of 255 indicates the quality of the link is very high. The
correlation degree between spreading sequences and
incoming chips is computed over a period of 3 symbol
periods during the reception of the preamble of a
packet.
The LQI is reported along with each received packet in
the RX FIFO as shown in Figure 3-2.
© 2010 Microchip Technology Inc.
Link Quality Indication (LQI)
Preliminary
3.8
The IEEE 802.15.4 Standard defines two modes of
operation:
• Beacon-enabled network
• Nonbeacon-enabled network
3.8.1
In a beacon-enabled network, beacons will be transmit-
ted periodically by the PAN coordinator. These
beacons are mainly used to provide synchronization
services between all the devices in the PAN and also to
support other extended features, like Guaranteed Time
Slots (GTS), a Quality of Service (QoS) mechanism for
the IEEE 802.15.4 Standard. The PAN coordinator
defines the structure of the superframe using beacons.
Beacon-Enabled and
Nonbeacon-Enabled Networks
BEACON-ENABLED NETWORK
MRF24J40
DS39776C-page 97

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