TMDS181: I2C pins capacitance

Shifali N

Part Number: TMDS181

Hi,

I am using HDMI redriver IC TMDS181 devices on my board. I will be using single I2C bus to control 17 other slave devices. I am not sure whether the total bus capacitance will exceed 400pF or not. May I know the pin capacitance of I2C data and clock line of TMDS181 IC. So that I can calculate the maximum bus capacitance.

over 4 years ago

0 David (ASIC) Liu over 4 years ago

TI__Guru**** 177081 points

Please refer to section 6.8 DDC, I 2C, HPD, and ARC Electrical Characteristics, total capacitive load for each bus line max is 400pF.

Thanks

David

0 Shifali N over 4 years ago in reply to David (ASIC) Liu

Expert 2145 points

Hi David,

The I2C can have maximum bus capacitance of 400pF. But what is the line capacitance of SDA and SCL control pins. I will be using 1 I2C bus to connect 16 different slaves and TMDS181 is one of them. So 400pF is the maximum bus capacitance. Please let me know the line capacitance so that I can calculate what will be the maximum bus capacitance for my I2C bus

0 David (ASIC) Liu over 4 years ago in reply to Shifali N

TI__Guru**** 177081 points

Hi,

Unfortunately I do not have this info available.

Thanks

David

0 Shifali N over 4 years ago in reply to David (ASIC) Liu

Expert 2145 points

Hi David,

Can you please confirm whether HDMI CEC is open drain signal or not

0 David (ASIC) Liu over 4 years ago in reply to Shifali N

TI__Guru**** 177081 points

Hi,

The TMDS181 does not have a CEC pin.

Thanks

David

Interface

Interface forum

TMDS181: I2C pins capacitance