TMP422-Q1: I2C Data Hold Time Inquiry

Evan Wang

Expert 6770 points

Part Number: TMP422-Q1

Hi Team,

May I know why the t(HD;DAT) in TMP422-Q1 datasheet requires 25ns?

For other device, the min requirement should be 0ns.

So we're curious about why this one is different from other devices.

Since this parameter require MCU(Host ->R/W -> Slave) to follow so I believe we can adjust the Pullup resistance/MCU internal driver to change that slew rate(including PCB parasitic capacitance).

Looking forward to your reply.

Thank you.

9 months ago

0 Meredith McKean 9 months ago

TI__Expert 5940 points

Hello Evan,

Please follow the 25ns spec. You can increasing the slew rate but be aware of violation the fall and rise time. Try to manipulate the clock to meet the specs.

Best Regards,

Meredith McKean

0 Evan Wang 9 months ago in reply to Meredith McKean

TI__Expert 6770 points

Hi Meredith,

But I'm curious about why the t(HD;DAT) of this device has different timing requirement compare with other TMP devices.

Could you kindly share further details with me?

Thank you.

0 Meredith McKean 9 months ago in reply to Evan Wang

TI__Expert 5940 points

Hi Evan,

I cannot provide the details to why this spec differs from the commercial part. I want to highlight a key point below:

TMP422-Q1 was designed to be "I2C compatible", but not necessarily compliant. This means that it meets some, but not all, of the requirements set forth by the I2C standard. As long as the host/controller specs can be adjusted, it should be able to meet both the compliance requirements and the requirements set by the TMP422-Q1 datasheet.

Best Regards,

Meredith McKean

0 Evan Wang 9 months ago in reply to Meredith McKean

TI__Expert 6770 points

Hi Meredith,

Understand,

Thank you for the sharing.

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TMP422-Q1: I2C Data Hold Time Inquiry