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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TH71221 датащи(PDF) 18 Page - Melexis Microelectronic Systems |
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TH71221 датащи(HTML) 18 Page - Melexis Microelectronic Systems |
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18 / 44 page  TH71221 27 to 930MHz FSK/FM/ASK Transceiver 39010 071221 Page 18 of 44 Data Sheet Rev. 005 June/07 4 Description of User Modes 4.1 Stand-alone User Mode Operation After power up the transceiver is set to stand-alone user mode. In this mode, pins FS0/SDEN and FS1/LD must be connected to VEE or VCC to set the desired frequency of operation. The logic level at pin FS0/SDEN must not be changed after power up in order to remain in stand-alone user mode. The default settings of the control word bits in stand-alone user mode are described in the frequency selection table. Detailed informa- tion about the default settings can be found in the tables of section 5. 4.1.1 Frequency Selection Channel frequency 433.92 MHz 868.3 MHz 315 MHz 915 MHz FS0/SDEN 1 0 1 0 FS1/LD 0 0 1 1 Reference oscillator frequency 7.1505 MHz R counter ratio in RX mode (RR) 32 16 18 32 PFD frequency in RX mode 223.45 kHz 446.91 kHz 397.25 kHz 223.45 kHz N counter ratio in RX mode (NR) 1894 1919 766 4047 VCO frequency in RX mode 423.22 MHz 857.60 MHz 304.30 MHz 904.30 MHz RX frequency 433.92 MHz 868.30 MHz 315.00 MHz 915.00 MHz R counter ratio in TX mode (RT) 32 16 18 32 PFD frequency in TX mode 223.45 kHz 446.91 kHz 397.25 kHz 223.45 kHz N counter ratio in TX mode (NT) 1942 1943 793 4095 VCO frequency in TX mode 433.92 MHz 868.30 MHz 315.00 MHz 915.00 MHz TX frequency 433.92 MHz 868.30 MHz 315.00 MHz 915.00 MHz IF in RX mode 10.7 MHz 10.7 MHz 10.7 MHz 10.7 MHz In stand-alone user mode, the transceiver can be set to Standby, Receive, Transmit or Idle mode (only PLL synthesizer active) via control pins RE/SCLK and TE/SDTA. The modulation scheme and the LNA gain are set by pins ASK/FSK and GAIN_LNA, respectively. 4.1.2 Operation Mode Operation mode Standby Receive Transmit Idle RE/SCLK 0 1 0 1 TE/SDTA 0 0 1 1 Note: Pins with internal pull-down |
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