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RFPIC12F675 bảng dữ liệu(PDF) 56 Page - Microchip Technology

tên linh kiện RFPIC12F675
Giải thích chi tiết về linh kiện  20-Pin FLASH-Based 8-Bit CMOS Microcontroller with UHF ASK/FSK Transmitter
PDF  136 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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RFPIC12F675 bảng dữ liệu(HTML) 56 Page - Microchip Technology

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rfPIC12F675
DS70091A-page 54
Preliminary
 2003 Microchip Technology Inc.
9.9
Digital Control Signals
The mode control logic pin RFEN controls the
operation of the transmitter. When RFEN goes high,
the crystal oscillator starts up. The voltage on the LF
pin ramps up proportionally to the RF frequency. The
PLL can lock onto the frequency faster than the start-
ing up crystal can stabilize. When the LF pin reaches
0.8V, the RF frequency is close to locked on the crys-
tal frequency. This initiates a 150 microsecond delay
to ensure that the PLL settles. After the delay, the PS
bias current and power amplifier are enabled to start
transmitting when DATA
ASK goes high.
When RFEN is low, the transmitter goes into a very
low power Standby mode. The power amplifier is
disabled and the crystal oscillator stops. The RFEN
pin has an internal pull-down resistor.
9.10
Low Voltage Output Disable
The rfPIC12F675 transmitter has a built in low voltage
disable centered at about 1.85V. If the supply voltage
drops below this voltage the power amplifier is
disabled to prevent uncontrolled transmissions.



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