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SM1212E433 数据表(PDF) 3 Page - Semtech Corporation

部件名 SM1212E433
功能描述  Ultra-Low Power Integrated 300-510MHz Transceiver
Download  77 Pages
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制造商  SEMTECH [Semtech Corporation]
网页  http://www.semtech.com
标志 SEMTECH - Semtech Corporation

SM1212E433 数据表(HTML) 3 Page - Semtech Corporation

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SX1212
ADVANCED COMMUNICATIONS & SENSING
Rev 2 – June 18th, 2009
Page 3 of 77
www.semtech.com
Index of Figures
Figure 1: SX1212 Simplified Block Diagram .................................. 5
Figure 2: SX1212 Pin Diagram ...................................................... 6
Figure 3: SX1212 Detailed Block Diagram .................................. 12
Figure 4: Power Supply Breakdown............................................. 13
Figure 5: Frequency Synthesizer Description .............................. 14
Figure 6: LO Generator ................................................................ 14
Figure 7: Loop Filter ..................................................................... 16
Figure 8: Transmitter Architecture ............................................... 18
Figure 9: I(t), Q(t) Overview ......................................................... 18
Figure 10: PA Control................................................................... 21
Figure 11: Optimal Load Impedance Chart.................................. 21
Figure 12: Recommended PA Biasing and Output Matching ..... 22
Figure 13: Front-end Description ................................................. 22
Figure 14: Receiver Architecture ................................................. 23
Figure 15: FSK Receiver Setting ................................................. 23
Figure 16: OOK Receiver Setting ................................................ 23
Figure 17: Active Channel Filter Description................................ 24
Figure 18: Butterworth Filter's Actual BW .................................... 26
Figure 19: Polyphase Filter's Actual BW...................................... 26
Figure 20: RSSI Dynamic Range................................................. 27
Figure 21: RSSI IRQ Timings ...................................................... 28
Figure 22: OOK Demodulator Description ................................... 29
Figure 23: Floor Threshold Optimization...................................... 30
Figure 24: BitSync Description..................................................... 31
Figure 25: SX1212’s Data Processing Conceptual View ............. 34
Figure 26: SPI Interface Overview and uC Connections ............. 35
Figure 27: Write Register Sequence............................................ 36
Figure 28: Read Register Sequence............................................ 37
Figure 29: Write Bytes Sequence (ex: 2 bytes) ........................... 37
Figure 30: Read Bytes Sequence (ex: 2 bytes) ........................... 38
Figure 31: FIFO and Shift Register (SR)...................................... 38
Figure 32: FIFO Threshold IRQ Source Behavior........................ 39
Figure 33: Sync Word Recognition ...............................................40
Figure 34: Continuous Mode Conceptual View.............................41
Figure 35: Tx Processing in Continuous Mode .............................41
Figure 36: Rx Processing in Continuous Mode.............................42
Figure 37: uC Connections in Continuous Mode ..........................43
Figure 38: Buffered Mode Conceptual View .................................44
Figure 39: Tx processing in Buffered Mode (FIFO size = 16,
Tx_start_irq_0=0) ...............................................................45
Figure 40: Rx Processing in Buffered Mode (FIFO size=16,
Fifo_fill_method=0).............................................................46
Figure 41: uC Connections in Buffered Mode...............................47
Figure 42: Packet Mode Conceptual View....................................49
Figure 43: Fixed Length Packet Format........................................50
Figure 44: Variable Length Packet Format ...................................51
Figure 45: CRC Implementation ...................................................53
Figure 46: Manchester Encoding/Decoding..................................54
Figure 47: Data Whitening ............................................................54
Figure 48: uC Connections in Packet Mode .................................55
Figure 49: Optimized Rx Cycle .....................................................67
Figure 50: Optimized Tx Cycle......................................................68
Figure 51: Tx Hop Cycle ...............................................................69
Figure 52: Rx Hop Cycle...............................................................70
Figure 53: Rx
Tx
Rx Cycle ...................................................71
Figure 54: POR Timing Diagram...................................................72
Figure 55: Manual Reset Timing Diagram ....................................72
Figure 56: Reference Design Circuit Schematic ...........................73
Figure 57: Reference Design‘s Stackup .......................................74
Figure 58: Reference Design Layout (top view)............................74
Figure 59: Package Outline Drawing ............................................75
Figure 60: PCB Land Pattern........................................................75
Figure 61: Tape & Reel Dimensions .............................................76


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