47.7.5.1 IrDA Modulation

For baud rates up to and including 115.2 kbit/s, the RZI modulation scheme is used. “0” is represented by a light pulse of 3/16th of a bit time. Some examples of signal pulse duration are shown in the following table.

Table 47-10. IrDA Pulse Duration
Baud Rate Pulse Duration (3/16)
2.4 kbit/s 78.13 μs
9.6 kbit/s 19.53 μs
19.2 kbit/s 9.77 μs
38.4 kbit/s 4.88 μs
57.6 kbit/s 3.26 μs
115.2 kbit/s 1.63 μs

The following figure shows an example of character transmission.

Figure 47-34. IrDA Modulation