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SX1236IMLTRT Datasheet(PDF) 82 Page - Semtech Corporation |
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SX1236IMLTRT Datasheet(HTML) 82 Page - Semtech Corporation |
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82 / 96 page  www.semtech.com Page 82 SX1236 WIRELESS & SENSING DATASHEET Rev. 1. - December 2013 ©2013 Semtech Corporation 7.3.1.1. Timing Diagram When no signal is received, the circuit wakes every Timer1 + Timer2 and switches to Receive mode for a time defined by Timer2, as shown on the following diagram. If no Preamble is detected, it then switches back to Idle mode, i.e. Sleep mode with RC oscillator on. Figure 36. Listen Mode with No Preamble Received If a Preamble signal is detected, the Sequencer is switched off. The PreambleDetect signal can be mapped to DIO4, in order to request the user's attention. The user can then take appropriate action. Figure 37. Listen Mode with Preamble Received No received signal Receive Receive Idle ( Sleep + RC ) Idle Timer2 Timer1 Timer2 Timer1 Timer1 Timer2 Received signal Preamble ( As long as T1 + 2 * T2 ) Sync Word Payload Crc Receive Idle ( Sleep + RC ) Timer1 Preamble Detect Timer2 |
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