S1

S2

5 V

HPD_SINK

HPD[3]

5 V_PWR3

PORT3 isnonselected

port

PORT3 isselectedport

PORT3 isnonselected

port

tS1(HPD)

tpd1( HPD)

tS2(HPD)

2.5V

2.5V

(5V_PWR3)/2

(5V_PWR3)/2

5 V

5 V

2.5V

(5V_PWR3)/2

IRQ

ELECTRICAL CHARACTERISTICS

TMDS461

Figure 3. HPD Timing Diagram #2

interrupt indicator pin. The TMDS461 issues Interrupt Requests by raising the IRQ pin from low to high, which

can be detected by the sink micro-controller. An Interrupt Request occurs when any system level change is

detected by TMDS461, which is a change in 5V_PWR on the source side, a change in the selected port, or a

the current status of 5V_PWR, the selected port, and clock detect status. Once the micro-controller has read

0x01, the IRQ pin returns to low.

0x01

GPIO mode: When TMDS461 is configured in GPIO mode, the IRQ pin in TMDS461 functions as a clock-detect

indicator pin for the selected port. If a valid clock is detected by the clock detect circuit, IRQ goes high. If no valid

over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

High-level output voltage

2.4

V

Low-level output voltage

0

0.4

V

Output source impedance

800

1000

1200

k

Ω

Copyright © 2009, Texas Instruments Incorporated

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