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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

:

in this mode the RF803E-ALPHA will transmit continuously while an input is

asserted,

And stop when it is released.

High:

In this mode the RF803 will transmit only when an input changes state.

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