MRF24J40-I/ML Microchip Technology, MRF24J40-I/ML Datasheet - Page 12

• 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

2.13
The MRF24J40 communicates with a host micro-
controller via a 4-wire SPI port as a slave device. The
MRF24J40 supports SPI (mode 0,0) which requires
that SCK idles in a low state. The CS pin must be held
low while communicating with the MRF24J40.
Figure 2-4 shows timing for a write operation. Data is
received by the MRF24J40 via the SDI pin and is
clocked in on the rising edge of SCK. Figure 2-5 shows
timing for a read operation. Data is sent by the
MRF24J40 via the SDO pin and is clocked out on the
falling edge of SCK.
FIGURE 2-4:
FIGURE 2-5:
DS39776C-page 12
MRF24J40
SDO
SCK
SDO
SDI
SCK
CS
SDI
Serial Peripheral Interface (SPI)
Port Pins
CS
SPI PORT WRITE (INPUT) TIMING
SPI PORT READ (OUTPUT) TIMING
MSb
MSb
Preliminary
Note:
The SDO pin 17 defaults to a low state
when CS is high (the MRF24J40 is not
selected). If the MRF24J40 is to share a
SPI bus, a tri-state buffer should be placed
on
high-impedance signal to the SPI bus. See
Section 4.4 “MRF24J40 Schematic and
Bill of Materials” for an example
application circuit.
LSb
the
SDO
© 2010 Microchip Technology Inc.
signal
LSb
to
provide
a