MRF24J40-I/ML Microchip Technology, MRF24J40-I/ML Datasheet - Page 106

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

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

3.10
Interframe Spacing (IFS) allows the MAC sublayer time
to process data received by the PHY. The length of the
IFS period depends on the size of the frame that is to be
transmitted. Frames up to aMaxSIFSFrameSize
(18 octets) in length shall be followed by a SIFS period
of at least aMinSIFSPeriod (12) symbols. Frames with
lengths greater than aMaxSIFSFrameSize shall be fol-
lowed by a LIFS period of at least aMinLIFSPeriod
(40) symbols. If the transmission requires an Acknowl-
edgment, the IFS shall follow the Acknowledgment
frame. Figure 3-8 shows the relationship between
frames and IFS periods. Refer to IEEE 802.15.4-2003,
Section 7.5.1.2 “IFS” for more information.
The
aMinSIFSPeriod as a constant value of 12 symbol
periods. The aMinSIFSPeriod can be programmed
FIGURE 3-8:
TABLE 3-12:
DS39776C-page 106
MRF24J40
Addr.
0x2E TXSTBL
0x21 TXPEND
0x27 TXTIME
Acknowledged Transmission:
Unacknowledged Transmission:
IEEE
Interframe Spacing (IFS)
Name
Long Frame
Long Frame
Where aTurnaroundTime = t
802.15.4
REGISTERS ASSOCIATED WITH INTERFRAME SPACING
TURNTIME3
RFSTBL3
MLIFS5
Bit 7
INTERFRAME SPACING (IFS)
Specification
TURNTIME2
RFSTBL2
MLIFS4
t
ack
Bit 6
LIFS
ACK
TURNTIME1
RFSTBL1
≤
MLIFS3
Short Frame
defines
Bit 5
ack
Preliminary
= (aTurnaroundTime + aUnitBackoffPeriod)
≤
TURNTIME0
RFSTBL0
LIFS
MLIFS2
Bit 4
SIFS
by the MSIFS (TXSTBL 0x2E<3:0>) and RFSTBL
(TXSTBL 0x2E<7:4>) bits, where aMinSIFSPeriod =
MSIFS + RFSTBL.
The
aMinLIFSPeriod as a constant value of 40 symbol
periods. The aMinLIFSPeriod can be programmed
by the MLIFS (TXPEND 0x21<7:2>) and RFSTBL
(TXSTBL 0x2E<7:4>) bits, where aMinLIFSPeriod =
MLFS + RFSTBL.
The IEEE 802.15.4 Specification defines aTurn-
aroundTime as a constant value of 12 symbol
periods. The aTurnaroundTime can be programmed
by the TURNTIME (TXTIME 0x27<7:4>) and RFSTBL
(TXSTBL 0x2E<7:4>) bits, where aTurnaroundTime
= TURNTIME + RFSTBL.
Short Frame
IEEE
MLIFS1
MSIFS3
Bit 3
r
802.15.4
MSIFS2
MLIFS0
t
Bit 2
ack
r
© 2010 Microchip Technology Inc.
Specification
GTSSWITCH
ACK
MSIFS1
Bit 1
r
SIFS
MSIFS0
FPACK
Bit 0
defines
r