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ZHCS404F September 2011 – October 2015 TPD12S016

PRODUCTION DATA.

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

8.1 Application Information

TPD12S016 provides IEC 61000-4-2 Level 4 Contact ESD rating to the HDMI 1.4 transmitter port. Buffered VLT's translate DDC and CEC channels bidirectionally. The system is designed to work properly with no external pullup resistors on the DDC, CEC, and HPD lines. The CEC line has an integrated 3.3-V rail, eliminating the need for a 3.3-V supply on board.

8.2 Typical Application

The TPD12S016 is placed as close as possible to the HDMI connector to provide voltage level translation, 5V_OUT current limiting and overall ESD protection for the HDMI controller.

8.2.1 Example 1: HDMI Controller Using One Control Line

In the example shown in Figure 15, the HDMI driver chip is controlling the TPD12S016 through only one control line, CT_HPD. In this mode the HPD_A to LS_OE pin are connected as shown in the oval dotted line of Figure 15. To fully enable TPD12S016, set CT_HPD above V_IH. To fully disable TPD12S016, set CT_HPD below V_IL.

Figure 15. TPD12S016 with an HDMI Controller Using One GPIO for HDMI Interface Control

8.2.1.1 Design Requirements

For this example, use the following table as input parameters:

Table 2. HDMI Controller Using One Control Line Design Parameters

DESIGN PARAMETERS			EXAMPLE VALUE
Voltage on V_CCA			1.8 V
Voltage on V_CC5V			5.0 V
Drive CT_HPD low (disabled)			–0.5 V to 0.4 V
Drive CT_HPD high (enabled)			1.0 V to 1.8 V
Drive a logical 1	A to B	SCL and SDA	1.26 V to 1.8 V
	A to B	CEC	1.26 V to 1.8 V
	B to A	SCL and SDA	3.5 V to 5.0 V
	B to A	CEC	2.31 V to 3.3 V
Drive a logical 0	A to B	SCL and SDA	–0.5 V to 0.117 V
	A to B	CEC	–0.5 V to 0.117 V
	B to A	SCL and SDA	–0.5 V to 1.5 V
	B to A	CEC	–0.5 V to 0.99 V

8.2.1.2 Detailed Design Procedure

To begin the design process, the designer needs to know the V_CC5V voltage range and the logic level, V_CCA, voltage range.

8.2.1.3 Application Curves

Figure 16. Eye Diagram Using EVM Without TPD12S016 for the TMDS Lines at 1080p, 340 MHz Pixel Clock, 3.4 Gbps

Figure 17. Eye Diagram Using EVM With TPD12S016 for the TMDS Lines at 1080p, 340 MHz Pixel Clock, 3.4 Gbps

8.2.2 Example 2: HDMI Controller Using CT_HPD and LS_OE

Some HDMI driver chips may have two GPIOs to control the HDMI interface chip. In this case a flexible power saving mode can be implemented. The load switch can be activated by CT_HPD while the level shifters are inactive, using LS_OE. This results in TPD12S016 drawing only approximately 30 µA, a reduction of 170 µA from being fully on. After a hot plug is detected, the HDMI controller can enable the rest of the HDMI interface chip using LS_OE.

Figure 18. TPD12S016 with an HDMI Controller Using Two GPIOs For HDMI Interface Control

8.2.2.1 Design Requirements

For this example, use Table 3 for input parameters:

Table 3. HDMI Controller Using CT_HPD and LS_OE Design Parameters

DESIGN PARAMETERS			EXAMPLE VALUE
Voltage on V_CCA			3.3 V
Voltage on V_CC5V			5.0 V
Drive CT_HPD low (disabled)			–0.5 V to 0.4 V
Drive LS_OE low (disabled)			–0.5 V to 0.4 V
Drive CT_HPD high (enabled)			1.0 V to 3.3 V
Drive LS_OE high (enabled)			1.0 V to 3.3 V
Drive a logical 1	A to B	SCL and SDA	2.31 V to 3.3 V
	A to B	CEC	2.31 V to 3.3 V
	B to A	SCL and SDA	3.5 V to 5.0 V
	B to A	CEC	2.31 V to 3.3 V
Drive a logical 0	A to B	SCL and SDA	–0.5 V to 0.214 V
	A to B	CEC	–0.5 V to 0.214 V
	B to A	SCL and SDA	–0.5 V to 1.5 V
	B to A	CEC	–0.5 V to 0.99 V

8.2.2.2 Detailed Design Procedure

To begin the design process, the designer needs to know the V_CC5V voltage range and the logic level, V_CCA, voltage range.

8.2.2.3 Application Curves

Refer to Application Curves for related application curves.