SX1239IMLTRT Semtech, SX1239IMLTRT Datasheet - Page 32

• Manufacturer Part Number: SX1239IMLTRT
• Description: IC, RF RECEIVER, 1.02GHz, QFN-24
• Manufacturer: Semtech

Specifications of SX1239IMLTRT

• Applications: Wireless Sensor Networks, Automated Meter Reading, Home And Building Automation
• Receiving Current: 16mA
• Data Rate: 300Kbps
• Modulation Type: FSK, OOK
• Sensitivity Dbm: -120dBm
• Rohs Compliant: Yes
• Rf Ic Case Style: QFN
• No. Of Pins: 24
• Sensitivity (dbm): -120dBm
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.2.2. Rx Start Procedure
As described in the former sections, the RxReady interrupt warns the uC that the receiver is ready.
4.2.3. Optimized Frequency Hopping Sequences
In a frequency hopping-like application, it is required to turn off the receiver when hopping from one channel to another, to
optimize the hopping sequence:
Receiver hop from Ch A to Ch B:
(0) SX1239 is in Rx mode in Ch A
(1) Change the carrier frequency in the RegFrf registers
(2) Program the SX1239 in FS mode
(3) Turn the receiver back to Rx mode
(4) Respect the Rx start procedure, described in section 4.2.4
Note
Rev 3 - Jan 2011
ADVANCED COMMUNICATIONS & SENSING
In Continuous mode with Bit Synchronizer, the receiver will start locking its Bit Synchronizer on a minimum or 12 bits of
received preamble (see section 3.4.14 for details), before the reception of correct Data, or Sync Word (if enabled) can
occur.
In Continuous mode without Bit Synchronizer, valid data will be available on DIO2/DATA right after the RxReady
interrupt.
In Packet mode, the receiver will start locking its Bit Synchronizer on a minimum or 12 bits of received preamble (see
section 3.4.14 for details), before the reception of correct Data, or Sync Word (if enabled) can occur.
the above sequence assumes that the sequencer is turned on (SequencerOff=0 in RegOpMode).
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