HD3SS214

SLAS907 – DECEMBER 2015

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Feature Description (continued)

8.3.2 HPD, AUX, and DDC Switching

HPD, AUX, and DDC switching is supported through the HD3SS214. This enables the device to work in multiple

application scenarios within multiple electrical standards. The AUXA/B and DDCA/B lines can both be switched

to the AUXC port. This feature supports DP++ or AUX only adapters. For HDMI applications, the DDC channels

are switched to the DDC_C port only and the AUX channel can remain active or the end user can make it float.

8.3.3 Output Enable and Power Savings

The HD3SS214 has two power modes, active/normal operating mode, and standby mode. During standby mode,

the device consumes very little current to save the maximum power. To enter standby mode, the OE control pin

is pulled low and must remain low. For active/normal operation, the OE control pin should be pulled high to VDD

through a resistor.

8.4 Device Functional Modes

The HD3SS214 behaves as a two to one or one to two using high bandwidth pass gates. The input ports are

selected using the Dx_SEL pin and Dx_SEL pin which are shown in Table 1.

CONTROL LINES

SWITCHED I/O PINS

(2)

AUX_S

DCz(p) Pin

DCz(n) Pin

Dx_SEL

HPDC Pin

AUXA

AUXB

AUXC

DDCA

DDCB

DDCC

EL

z = 0, 1 ,2 or 3

z = 0, 1 ,2 or 3

To/From

L

L

DAz(p)

DAz(n)

HPDA

To/From AUXC

Z

Z

Z

Z

AUXA

To/From

L

H

DBz(p)

DBz(n)

HPDB

Z

To/From AUXC

Z

Z

Z

AUXB

To/From

To/From

H

L

DAz(p)

DAz(n)

HPDA

Z

Z

Z

Z

DDCA

AUXC

To/From

H

H

DBz(p)

DBz(n)

HPDB

Z

Z

Z

To/From AUXC

Z

DDCB

To/From

To/From

M

(2)

L

DAz(p)

DAz(n)

HPDA

To/From AUXC

Z

Z

To/From DDCA

AUXA

DDCC

To/From

M

(2)

H

DBz(p)

DBz(p)

HPDB

Z

To/From AUXC

Z

To/From DDCC

To/From DDCB

AUXB

(1)

OE pin - For normal operation, drive OE high. Driving the OE pin low will disable the switch. Note: The ports which are not selected by

the control lines will be in high impedance status.

(2)

Z = High Impedance

10

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