RF / IR Encoder / Decoder Chipset

RF600E

RF Evaluation Boards,

RF600D

Receiver Decoder RF600D

Operational Description

The RF600D is simple to use. As shown in the typical application circuits, in the stand alone operation the

RF600D has the capability to learn up to 7 unique RF600E transmitters. With the addition of an EEPROM

memory device this is increased to 48 RF600E encoders.

The RF600D requires only the addition of the following components

1.

A ‘learn’ switch which is used in the process of learning a transmitter/encoder to the decoder and

also to initiate erasure of encoder information.

2.

An LED which indicates the status of the learn process, the erase process and also data reception

status.

3.

An option link resistor which allows configuration for AM or FM data reception. (data mark selection).

4.

An option link resistor which allows selection of 4 momentary or 4 latched outputs. This input may

simply be tied to Vcc or GND to fix the output operation.

The RF600D may operate with an external 96C76 EEPROM device as additional memory to store identity

information of transmitter/encoders. Data stored within the EEPROM is encrypted to maintain security.

Each RF600D+EEPROM combination can learn up to 48 unique transmitter/encoders.

The RF600D is connected directly to the data output of a radio receiver module and upon detection of a

valid data packet it will decode the Keeloq encrypted data stream. When an address match occurs the

RF600D asserts its 4 digital outputs. These will match the state of the RF600E encoder’s 4 digital inputs at

the time of transmission. An additional output, which shows the status of the encoder battery, is also

asserted.

The digital outputs may be configured as latching or momentary action. (Latch = the output will change

state on each successive transmit of the encoder. Momentary = the output will only operate for as long as

the RF600E encoder is transmitting).

EEPROM storage

When the RF600D is used in its internal eeprom mode it can learn the identity of up to 7 transmitters. If

required, an external 96C76 eeprom can be connected as shown below and this will be automatically

detected by the device and will allow the decoder to learn the identity of up to 48 transmitters.

Serial Data Output

The RF600D has a serial data output. This outputs the serial number, button and battery status of the

transmitter encoder (RF600E) it has successfully received. It also gives an indication of which inputs of the

encoder have been activated and the status of the encoder battery. This data may be fed directly to a

microcontroller or RS232 type driver circuit which may then be fed directly to a PC serial port. (An RS232

serial data output is provided on SA123 & RFEVAL2).

Serial data is output continually whilst data is being received from the RF600E transmitter. i.e. this output

is valid regardless of whether the RF600E encoder has been learnt to the RF600D decoder or not. If the

user requires the serial number of pre-learnt RF600E encoders only, then the serial output should be

configured only to output data when one of the digital outputs from the RF600D is asserted. (Digital

outputs from the RF600E will only activate when a RF600E encoder has been pre-learnt.)

The data received by RF600D (from the RF600E encoder) is checked for correct Manchester coding (it is

not KeeLoq decrypted) and the following data is output from the SD1 pin.

•

The 7 digit KeeLoq serial number.

•

The KeeLoq button data and transmitter battery state.

•

A carriage return character and a line feed character.

DS600-9 Sept ‘04

©2004 Reg. No. 227 4001, ENGLAND

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