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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RFHCS362F датащи(PDF) 35 Page - Microchip Technology |
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RFHCS362F датащи(HTML) 35 Page - Microchip Technology |
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35 / 60 page  © 2002 Microchip Technology Inc. Preliminary DS41189A-page 35 rfHCS362G/362F 6.7 Mode Control Logic The mode control logic pin RFENIN controls the oper- ation of the transmitter (Table 6-7). When RFENIN goes high, the crystal oscillator starts up. The voltage on the LF pin ramps up proportionally to the RF fre- quency. The PLL can lock onto the frequency faster than the starting up crystal can stabilize. When the LF pin reaches 0.8V, the RF frequency is close to locked on the crystal frequency. This initiates a 150 micro- second delay to ensure that the PLL settles. After the delay, the PS/DATAASK bias current and power ampli- fier are enabled to start transmitting. When RFENIN goes low, the transmitter goes into low power Standby mode. The power amplifier is dis- abled, the crystal oscillator stops, and the PS/ DATAASK pin is driven low. This will be a conflict if other circuitry drives the PS/DATAASK pin high while RFENIN is low. The encoder DATA pin is typically the only con- nection to PS/DATAASK and it always drives DATA low before RFENOUT goes low. For most applications the RFENIN pin is connected directly to the RFENOUT pin. The RFENIN pin has an internal pull-down resistor. TABLE 6-7: RFENIN PIN STATES RFEN Description 0 Transmitter and CLKOUT in Standby 1 Transmitter and CLKOUT enabled |
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