DS800-4 July ’07

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Radio Encoder / Decoder IC’s

RF800

Pin Descriptions:

RF Baud Rate:

The RF800 ICs are capable of being set to one of two RF data rates. The 100 / 400 Input allows selection of

either 100 or 400 us element times on the RF serial data output. The input is read only at power up: a ‘1’ sets

100 us and a ‘0’ sets 400us. Please note that that the encoder and decoder must be set to the same element

time. In order to operate an RF800 decoder with a 200 series transmitter the RF800 decoder must be set for

400us element time.

Mode Pin:

The RF800 device can be configured to act as either a decoder or an encoder. This selection is made using the

mode pin. If the mode pin is held low the RF800 will act as a decoder and pin functions will be as the

description for a decoder.

If the mode pin is held high then the RF800 will act as an encoder IC and the pin functions will be as the

description for the encoder.

Oscillator:

The RF800 device requires an external oscillator running at 4 MHz, please refer to the microchip datasheet for

the 16F876A if more detailed information is required.

TEN / LRN:

This is a dual function pin.

•

When configured as a decoder: this pin acts as Learn pin, which enables the RF800 decoder

to learn and record the address of compatible transmitters.

•

When configured as an encoder: this pin acts as a transmitter enable. This is used for

controlling the switching of power to the radio transmitter. This is an active high output.

TEN / 204:

This is a dual function pin.

•

When configured as a decoder: this pin allows selection between momentary or latching mode

when used with the 204 handheld transmitters.

•

When configured as an encoder: this pin acts as a transmitter enable. This can be for

controlling the switching of power to the radio transmitter. This is an active low output.

LED:

This is a dual function pin.

•

When configured as a decoder: this pin acts as a learn LED drive output and gives indication

of learn (and erase) progress.

•

When configured as an encoder: acts as an LED drive output and gives indication of radio data

transmission.