HD3SS215_15 Datasheet, PDF (13/31 Pages) Texas Instruments – HD3SS215 6.0 Gbps HDMI DisplayPort 2:1/1:2 Differential Switch

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HD3SS215, HD3SS215I
SLAS971C – MAY 2014 – REVISED AUGUST 2015
8.3 Feature Description
8.3.1 High Speed Switching
The HD3SS215 supports switching of 6Gbps data rates. The wide common mode of the device enables it to
support TMDS signal levels and DisplayPort signals. The high speed muxing is designed with a wide -3dB
differential bandwidth of 7 GHz and industry leading dynamic characteristics. All of these attributes help maintain
signal integrity in the application. Each high speed port incorporates 20kΩ pull down resistors that are switched
in when the port is not selected and switched out when the port is selected.
8.3.2 HPD, AUX, and DDC Switching
HPD, AUX and DDC switching is supported through the HD3SS215. 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 HD3SS215 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
8.4.1 Switch Control Modes
Refer to the Functional Block Diagram.
The HD3SS215 behaves as a two to one or one to two differential switch using high bandwidth pass gates. The
input ports are selected using the AUX_SEL pin and Dx_SEL pin which are shown in Table 1.
Table 1. Switch Control Logic^(1)(2)(3)
CONTROL LINES⁽⁴⁾
AUX_SEL Dx_SEL
L
L
DCz(p) Pin
z = 0, 1, 2 or 3
DAz(p)
DCz(n) Pin
z = 0, 1, 2 or 3
DAz(n)
HPDC Pin
HPDA
L
H
DBz(p)
DBz(n)
HPDB
H
L
DAz(p)
DAz(n)
HPDA
H
H
DBz(p)
DBz(n)
HPDB
M ⁽⁴⁾
L
DAz(p)
DAz(n)
HPDA
M ⁽⁴⁾
H
DBz(p)
DBz(n)
HPDB
SWITCHED I/O PINS
AUXA
AUXB
AUXC
To/From
AUXC
Z
Z
Z
To/From
AUXC
Z
Z
Z
To/From
AUXC
Z
Z
To/From
AUXC
To/From
AUXA
To/From
AUXB
To/From
DDCA
To/From
DDCB
To/From
AUXA
To/From
AUXB
DDCA
Z
Z
To/From
AUXC
Z
To/From
DDCC
Z
DDCB
Z
Z
Z
To/From
AUXC
Z
To/From
DDCC
DDCC
Z
Z
Z
Z
To/From
DDCA
To/From
DDCB
(1) Z = High Impedance
(2) OE pin - For normal operation, drive OE high. Driving the OE pin low will disable the switch.
(3) The ports which are not selected by the control lines will be in high impedance status.
(4) For HDMI application, keep the AUX_SEL at middle level voltage. The AUX channel is still active, and the end user can make the lines
float.
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