ALPHA Encoder / Decoder IC’s
RF803-ALPHA
IP 1-3
These are the switch inputs which when operated wake up the RF803E-ALPHA and cause
transmission. They may be switched directly to Ground. Transmission occurs for the duration of
the switch operation.
ACK FAILED LED
This Output is normally low, asserted High when a transmission fails. A transmission is re-tried
5 times when an acknowledgement is not immediately received. If none is received after the 5
re-try attempts, the Output will be asserted.
TX LED
While transmitting the TX output will toggle at high frequency (flicker LED) when the
transmission is finished the output will be asserted continuously for 2 seconds to show that an
acknowledgement has been received.
ACK – Acknowledge Request
This pin is used to set an acknowledgement request from the Receiver or not.
Only enable when using TRX modules.
CONT – Continuous TX
Low:
asserted,
in this mode the RF803E-ALPHA will transmit continuously while an input is
And stop when it is released.
In this mode the RF803 will transmit only when an input changes state.
High:
Vcc
The power supply needs to be a stable regulated voltage between 2.5 and 5.5V with <10mV
ripple. Note that in idle mode the transmitter current drain is typically only 100nA.
GND
Ground connection
DS803-ALPHA-1 Nov ‘09
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