ALPHA Encoder / Decoder IC’s
RF803-ALPHA
Vcc
2.5-5.5V DC input. The power supply needs to be a stable regulated voltage with <10mV ripple
GND
Ground connection.
OP1-3
These outputs are asserted LOW when the relevant inputs (I/P1 – I/P3) on the RF803E-ALPHA
are asserted.
RX LED
While a valid signal is present the Learn/RX LED output will toggle at high frequency (flicker
LED)
Note that this output will be valid whether or not, the RF803E-ALPHA has been learnt to the
RF803D-ALPHA or not
LRN
This input is used to set the decoder module to ‘Learn Mode’ and for the ‘Erase Function’ and is
also used to drive the Status LED.
OP TIMING
This pin is read on power up to sets the action of outputs 1-3. Latching is set using connection
to Vcc via a 250K resistor (R8). Momentary is set by connecting direct to GND .This may need
to be dropped to 10K in noisy environments.
SERIAL
In normal run mode this pin outputs serial data on reception of a valid data string, this pin will
output any valid serial data packet regardless of learn status.
DS803-ALPHA-1 Nov ‘09
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