Difference between HDMI serial I2C and general I2C

Manoj Shenoy

Prodigy 130 points

Other Parts Discussed in Thread: DM388

Hi ,

A very basic question.

I am using DM388 processor in which I2C1 SDA SCL is muxed with HDMI SDA SCL.

Is there any difference between this HDMI I2C serial I/O and general I2C.Why it dedicately mentioned?

over 9 years ago

0 Siby James over 9 years ago

TI__Expert 5140 points

Hi Manoj,

Thanks for the question.

I will move this question to the DM3X Forum for better support.

Thanks,
Siby

0 Pavel Botev over 9 years ago

TI__Guru**** 170625 points

Hi Manoj,

That HDMI I2C can only be used from HDMI IP. This is used by HDMI IP for communicating with the display devices like TV and monitors.

The HDMI has Master I2C interface for display data channel (DDC) connection. The HDMI bus has Display Data Channel (I2C bus for configuration and status exchange between two devices). The DDC connects just like a standard I2C bus.

The HDMI module can drive the display data channel (DDC) bus, which supports a variety of I2C commands, on the hdmi_ddc_scl and hdmi_ddc_sda pins. This allows the TV-set/monitor to provide information to the host device, such as supported resolutions.

See also:

e2e.ti.com/.../423708

BR
Pavel

0 Manoj Shenoy over 9 years ago in reply to Pavel Botev

Prodigy 130 points

Thanks for the reply Pavel

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Difference between HDMI serial I2C and general I2C