MRF24J40-I/ML Microchip Technology, MRF24J40-I/ML Datasheet - Page 123

• 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

Beacon-Enabled Device mode – Figure 3-18 shows
the Sleep time line for Beacon-Enabled Device mode.
In this mode, the sum of the main and remain counters
is the inactive period of the superframe. The
MRF24J40 will time the inactive period as shown in
Equation 3-3.
EQUATION 3-3:
FIGURE 3-18:
© 2010 Microchip Technology Inc.
Inactive Period = (MAINCNT * SLPCLK Period) +
(REMCNT * 50 ns)
Beacon
Active Portion
Duration (SD)
Superframe
Sleep Alert Interrupt
SLPIF (0x31<7>)
BEACON-ENABLED DEVICE SLEEP TIME LINE
20 MHz Main Oscillator
Remain
Counter
Counts
Turned OFF
Sleep Acknowledge
(0x35<7>)
SLPACK
Beacon Interval (BI)
Preliminary
Time
Sleep Period
Low-Current
Main Counter Counts
Inactive Portion
The MRF24J40 alerts the host processor on the bound-
ary of the active and inactive portion via a Sleep Alert
Interrupt (SLPIF 0x31<7>). The host microcontroller
Acknowledges the interrupt (SLPACK 0x35<7>), at
which time, the MRF24J40 turns off the 20 MHz main
oscillator.
WAKETIME = MAINCNT, the 20 MHz main oscillator is
turned on. The wake counter counts as the 20 MHz main
oscillator stabilizes. The MRF24J40 alerts the host
processor with a wake-up alert interrupt (0x31<6>).
WAKETIME = MAINCNT
20 MHz Main Oscillator
Turned ON
As
the
Wake-up Alert Interrupt
WAKEIF (0x31<6>)
main
Counts (~2 ms)
Wake Counter
MRF24J40
counter
DS39776C-page 123
Remain
Counter
Oscillator Stable
Counts
20 MHz Main
counts,
Beacon
when