Datasheet

HDQ
tB tBR
030-095
AM3517, AM3505
www.ti.com SPRS550E –OCTOBER 2009–REVISED MARCH 2013
6.6.9.1.2 IrDA—Transmit Mode
Table 6-121. UART IrDA—Signaling Rate and Pulse Duration—Transmit Mode
SIGNALING RATE ELECTRICAL PULSE DURATION UNIT
MIN NOMINAL MAX
SIR
2.4 Kbit/s 78.1 78.1 78.1 μs
9.6 Kbit/s 19.5 19.5 19.5 μs
19.2 Kbit/s 9.75 9.75 9.75 μs
38.4 Kbit/s 4.87 4.87 4.87 μs
57.6 Kbit/s 3.25 3.25 3.25 μs
115.2 Kbit/s 1.62 1.62 1.62 μs
MIR
0.576 Mbit/s 414 416 419 ns
1.152 Mbit/s 206 208 211 ns
FIR
4.0 Mbit/s (Single pulse) 123 125 128 ns
4.0 Mbit/s (Double pulse) 248 250 253 ns
6.6.10 HDQ / 1-Wire Interfaces
This module is intended to work with both the HDQ and the 1-Wire protocols. The protocols use a single
wire to communicate between the master and the slave. The protocols employ an asynchronous return to
1 mechanism where, after any command, the line is pulled high.
6.6.10.1 HDQ Protocol
Table 6-122 and Table 6-123 assume testing over the recommended operating conditions (see Figure 6-
57 through Figure 6-60).
Table 6-122. HDQ Timing Requirements
PARAMETER DESCRIPTION MIN MAX UNIT
t
CYCD
Bit window 253 s
t
HW1
Reads 1 68
t
HW0
Reads 0 180
t
RSPS
Command to host respond time
(1)
(1) Defined by software.
Table 6-123. HDQ Switching Characteristics
PARAMETER DESCRIPTION MIN TYP MAX UNIT
t
B
Break timing 193 s
t
BR
Break recovery 63
t
CYCH
Bit window 253
t
DW1
Sends1 (write) 1.3
t
DW0
Sends0 (write) 101
Figure 6-57. HDQ Break (Reset) Timing
Copyright © 2009–2013, Texas Instruments Incorporated Timing Requirements and Switching Characteristics 191
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