SX1239IMLTRT Semtech, SX1239IMLTRT Datasheet - Page 37
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SX1239IMLTRT
Manufacturer Part Number
SX1239IMLTRT
Description
IC, RF RECEIVER, 1.02GHz, QFN-24
Manufacturer
Semtech
Datasheet
1.SX1239IMLTRT.pdf
(73 pages)
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
Page 37
(+SR)
FIFO
SPI
DATASHEET
www.semtech.com
SX1239
MISO
NSS
SCK
MOSI
DIO1
DIO0
DIO2
DIO3
DIO4
DIO5