Diodes Incorporated

Frequently Asked Questions

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Can HPD pin be connected to +5V directly?

Per HDMI Spec 1.4, HPD should be pulled high to 5V through a 1kΩ resistor.

Can one single EEPROM be implemented at Scalar in HDTV instead of several EEPROMs at input HDMI connectors?

Per HDMI requirement, EEPROM is readable in power-off condition.  In other words, if DDC lines from HDMI connector can pass through Pericom switches and read the EEPROM at Scalar when only standby power is present in HDTV and when +5V is supplied from HDMI connector, one EEPROM implementation at Scalar is allowed.

Can PI3HDMI412FT-x be employed in 1.8Vcc application?

Yes.  For 1.8V application, Vcc and Vss of , PI3HDMI412FT-B should be set to 1.8V and GND, respectively.

Do Pericom's active switches support RxSense feature?

PI3HDMI101, PI3HDMI101 supports RxSense feature. With a detection scheme implemented in PCB, output TMDS of PI3HDMI101(-A) will be turned off if Sink termination is absent. Please refer to the Application Note (AN216)

A built-in detection circuit, which offers RxSense feature, is implemented in PI3HDMI101-B in order to save some external components and circuitry.

Is the TMDS swing specification of DVI different from that of HDMI?

The TMDS swing specification of DVI is the same as that of HDMI.

What is the lowest input TMDS voltage that Periocm IC can accept?

The lowest single-ended TMDS voltage that Peicom IC can accept is 2.0V.  At the same time, the max offset of the DC voltages between TMDS + and – is 0.25V.