DATA
1
0
1
0
0
1
1
1
1
0
0
t2
t1
t2
t1
IRTX
nIRTX
Parameter
min
typ
max
units
t1
Pulse Width at 115kbaud
Pulse Width at 57.6kbaud
Pulse Width at 38.4kbaud
Pulse Width at 19.2kbaud
Pulse Width at 9.6kbaud
Pulse Width at 4.8kbaud
Pulse Width at 2.4kbaud
Bit Time at 115kbaud
BitTime at 57.6kbaud
BitTime at 38.4kbaud
BitTime at 19.2kbaud
Bit Time at 9.6kbaud
1.41
1.41
1.41
1.41
1.41
1.41
1.41
1.6
3.22
4.8
9.7
19.5
39
2.71
3.69
5.53
11.07
22.13
44.27
88.55
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
t1
t1
t1
t1
t1
t1
t2
t2
t2
t2
t2
t2
t2
78
8.68
17.4
26
52
104
208
416
Bit Time at 4.8kbaud
Bit Time at 2.4kbaud
Notes:
1. IrDA@ 115k is HPSIR compatible. IrDA @ 2400 will allow compatibility with HP95LX
and 48SX.
2. IRTX: CRC Bit 1: 1 = XMIT active low
nIRTX: CRC Bit 1: 0 = XMIT active high
FIGURE 11 - IrDA TRANSMIT TIMING
147
SMSC [ SMSC CORPORATION ]
