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AN4099 Datasheet(PDF) 8 Page - STMicroelectronics

Part # AN4099
Description  Implementing transmitters and receivers for infrared remote control protocols using STM32F0xx and STM32F3xx microcontrollers
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4099 Datasheet(HTML) 8 Page - STMicroelectronics

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Infrared protocol specification
AN4099
8/39
Doc ID 023110 Rev 2
1.2
SIRC protocol basics
The SIRC code is a 12-bit word. It uses modulation of a 40 kHz IR carrier frequency. The
SIRC protocol uses pulse distance encoding of the bits. Each pulse is a 600 µs long, 40 kHz
carrier burst. A logical "1" takes 1.8 ms to transmit, while a logical "0" takes 1.2 ms to
transmit (Figure 4).
Figure 4.
Length of logical bits
A SIRC frame contains the following fields.
●
Start bit: the start burst is always 2.4 ms wide, followed by a standard space of 0.6 ms.
●
Command 7 bits length: this field holds 7 bits that are used as command fields.
●
Address 5 bits length: this field holds 5 bits that are used as address fields.
Figure 5.
Length of start bit
With this protocol, the LSB is transmitted first. As such, it is assembled LSB to MSB. Since it
is sent as 7 bits for command, followed by 5 bits for device address, the code must split the
12 received bits into two groups of 7 and 5 bits.
ai18552
600 μs
1.2 ms
600 μs
600 μs
Logical ‘0’
Logical ‘1’
ai18553
2.4 ms
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