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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CC2430-RTR1-F64 датащи(PDF) 185 Page - Texas Instruments |
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CC2430-RTR1-F64 датащи(HTML) 185 Page - Texas Instruments |
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185 / 234 page  CC2430 CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A Page 185 of 232 Figure 54: Single carrier output 14.30.2 Modulated spectrum The CC2430 has a built-in test pattern generator that can generate a pseudo random sequence using the CRC generator. This is enabled by setting MDMCTRL1L.TX_MODE to 3 and issuing a STXON command strobe. The modulated spectrum is then available on the RF pins. The low byte of the CRC word is transmitted and the CRC is updated with 0xFF for each new byte. The length of the transmitted data sequence is 65535 bits. The transmitted data-sequence is then: [synchronization header] [0x00, 0x78, 0xb8, 0x4b, 0x99, 0xc3, 0xe9, …] Since a synchronization header (preamble and SFD) is transmitted in all TX modes, this test mode may also be used to transmit a known pseudorandom bit sequence for bit error testing. Please note that CC2430 requires symbol synchronization, not only bit synchronization, for correct reception. Packet error rate is therefore a better measurement for the true RF performance. Another option to generate a modulated spectrum is to fill the TXFIFO with pseudo- random data and set MDMCTRL1L.TX_MODE to 2. CC2430 will then transmit data from the FIFO disregarding a TXFIFO underflow. The length of the transmitted data sequence is then 1024 bits (128 bytes). A plot of the modulated spectrum from CC2430 is shown in Figure 55. Note that to find the output power from the modulated spectrum, the RBW must be set to 3 MHz or higher. |
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