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Using the PIC16F639 MCU for Smart Wireless Applications

From Microchip Technology, Inc.
 

 
The PIC16F639 is a suitable microcontroller for bidirectional communications and low-frequency sensing applications. The device includes a PIC16F636 microcontroller and a three channel Low-Frequency (LF) front-end device in a single 20-pin SSOP package. These two devices are internally connected via SPI™ interface pads. The analog front-end section is optimized to detect 125 kHz low frequency (LF) signal. For the LF signal detection, it needs external LC resonant circuits. The device can detect amplitude-modulated 125 kHz input signals with a typical input sensitivity of 3 mVPP. This high input sensitivity allows for extended low-frequency detection ranges in applications. The device can transmit data by an internal LF talkback modulator for a proximity range communication or via an external UHF resonator for a long range communication. The device can transmit and receive secured data based on the built-in KEELOQ® cryptographic hardware peripheral.
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