SX1239IMLTRT Semtech, SX1239IMLTRT Datasheet - Page 37

• 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

5. Data Processing
5.1. Overview
5.1.1. Block Diagram
Figure below illustrates the SX1239 data processing circuit. Its role is to interface the data from the demodulator and the
uC access points (SPI and DIO pins). It also controls all the configuration registers.
The circuit contains several control blocks which are described in the following paragraphs.
The SX1239 implements several data operation modes, each with their own data path through the data processing section.
Depending on the data operation mode selected, some control blocks are active whilst others remain disabled.
5.1.2. Data Operation Modes
The SX1239 has two different data operation modes selectable by the user:
Each of these data operation modes is described fully in the following sections.
Rev 3 - Jan 2011
ADVANCED COMMUNICATIONS & SENSING
Continuous mode: each bit received is accessed in real time at the DIO2/DATA pin. This mode may be used if adequate
external signal processing is available.
Packet mode (recommended): user only retrieves payload bytes from the FIFO. The packet engine automatically
removes the preamble, checks the Sync word, performs AES decryption, checks the CRC, and decodes DC-free
schemes if enabled. The uC processing overhead is hence significantly reduced compared to Continuous mode.
Depending on the optional features activated (CRC, AES, etc) the maximum payload length is limited to FIFO size, 255
bytes or unlimited.
Data
Rx
Rx
Potential datapaths (data operation mode dependant)
RECOG.
SYNC
Figure 20. SX1239 Data Processing Conceptual View
HANDLER
PACKET
CONTROL
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(+SR)
FIFO
SPI
DATASHEET
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SX1239
MISO
NSS
SCK
MOSI
DIO1
DIO0
DIO2
DIO3
DIO4
DIO5