Continuing to provide novice and experienced RF designers with easy-to-adopt solutions, Microchip Technology has introduced a complete system solution for short-range uni-directional RF communication. Consisting of three microcontrollers with integrated transmitters and two receivers, the company now offers several products supporting frequency bands ranging from 260-930 MHz.
By combining the rfPIC12F675 microcontroller/transmitters with either the rfRXD0420 receiver or rfRXD0920 receiver, users can easily create a wireless uni-directional communication link for embedded control applications, says Microchip. The receivers can also be combined with the company's existing rfPIC devices and KEELOQ encoders to create remote sense and control applications.
Offered in a 32-pin low-profile, quad-flat pack (LQFP), the rfRXD0420 and rfRXD0920 single conversion super-heterodyne UHF RF receivers support frequency bands of 300-450 MHz and 850-930 MHz respectively. The devices offer a maximum data rate of 80 Kbps, a standby supply current of 100 nA and operate over a voltage range of 2,5 to 5,5 V. The active supply currents for the rfRXD0420 is 6,5 to 8,2 mA depending on the low noise amplifier (LNA) setting and 7,5 to 9,2mA for the rfRXD0920. The low operating and standby current extends battery life and the flexible receiver topology allows for bandwidth optimisation to improve system performance.
The rfPIC12F675 devices are 20-pin PICmicro microcontrollers that feature an integrated UHF RF transmitter. Output power for the transmitter section is specified at 6 dBm for increased range and is available in three frequency ranges: 260-350 MHz (rfPIC12F675K), 390-450 MHz (rfPIC12F675F), and 850-930 MHz (rfPIC12F675H) with a maximum data rate of 40 Kbps. A standby supply current of 100 nA and operating voltage range of 2,0 to 5,5 V make the devices suitable for low power battery operated applications. The microcontrollers feature a 14-bit instruction set with 1,8 KB of Flash program memory, 64 bytes RAM and 128 bytes EEPROM for non-volatile storage. Additional features include an analog comparator and four channels of 10-bit A/D, making it easy to interface to a sensor for wireless sensor applications.
Target applications include remote control (home appliance, fan control, light control, PC peripherals); command and control (air conditioning thermostats, water irrigation system); wireless sensors (temperature, smoke detectors, water level); home security (garage door openers, remote infrared sensors); and automotive (tyre pressure sensors, remote control, remote keyless entry).
For more information contact Avnet Kopp, 011 809 6100, Memec SA, 021 897 8600 or Tempe Technologies, 011 452 0530.
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