STFPC311 datasheet(25/39 Pages) STMICROELECTRONICS

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STFPC311

9 Remote control protocols

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Remote control protocols

9.1

RC-5 remote control

RC-5 remote control protocol is based on Bi-phase (also known as Manchester) encoding as

shown in Figure 21.

Note:

The encoding is set with reference to the IR_DATA_IN signal (after the photo diode). The MSB

is transmitted first see Figure 22.

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The first two Start bits (S1 and S2) are synchronization bits. For normal operation, they are

always set to '11' on the transmission side. After the photo diode, there is one inversion.

The data at the IR_DATA_IN of the STFPC311 is shown in Figure 23 on page 25

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The next bit is the Toggle bit. This bit is inverted each time a key on the remote control is

pressed.

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Bits A1and A5 are the Address bits. The address bits indicate the intended application that

the remote control protocol is used for.

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Bits C1..C6 are the Command bits. The command bits instruct the STFPC311 as to what

action is to be taken. The data representing the RC-5 protocol is sent as a byte of data

which consists of a Toggle bit and a ‘0’ bit followed by 6 bits of Command data.

Figure 21. Bi-phase encoding

Figure 22. RC-5 protocol frame

Figure 23. RC-5 reception example

STFPC311 Datasheet(PDF) 25 Page - STMicroelectronics