MRF24J40-I/ML Microchip Technology, MRF24J40-I/ML Datasheet - Page 122

• 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 Coordinator mode – Figure 3-17
shows the Sleep time line for Beacon-Enabled Coordi-
nator mode. In this mode, the sum of the main and
remain counters is the Beacon Interval (BI) of the
superframe. The MRF24J40 will transmit a beacon
packet as per Beacon Interval shown in Equation 3-2.
EQUATION 3-2:
FIGURE 3-17:
DS39776C-page 122
MRF24J40
Beacon Interval = (MAINCNT * SLPCLK Period) +
(REMCNT * 50 ns)
Beacon
Remain
Counter
Counts
Active Portion
Duration (SD)
Superframe
Sleep Alert Interrupt
SLPIF (0x31<7>)
BEACON-ENABLED COORDINATOR SLEEP TIME LINE
20 MHz Main Oscillator
Turned OFF
Sleep Acknowledge
(0x35<7>)
SLPACK
Main Counter Counts
Beacon Interval (BI)
Preliminary
Time
Sleep Period
Low-Current
Inactive Portion
WAKETIME = MAINCNT
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 and MAINCLK is disabled. The
MRF24J40 alerts the host processor with a wake-up alert
interrupt (0x31<6>).
20 MHz Main Oscillator
Turned ON
As
the
Wake-up Alert Interrupt
WAKEIF (0x31<6>)
main
© 2010 Microchip Technology Inc.
Counts (~2 ms)
Wake Counter
counter
Remain
Counter
Oscillator Stable
Counts
20 MHz Main
Beacon
counts,
when