TCA9517A:huguai

user4961418

Prodigy 190 points

Part Number: TCA9517A
Other Parts Discussed in Thread: TCA9800

TCA9517Aについて教えていただけますか?TCA9517Aについて教えていただけますか?回路図を添付します。

I2Cの不具合でMPUの動作が止まる。kairo.pdf

over 1 year ago

+1 Tyler Townsend over 1 year ago

TI__Guru 55148 points

Hi User4961418,

The reason for the two different VOL levels on A-side and B-side is inherent to the device design. Please see the VOL levels as listed in the datasheet.

When driving from A-side to B-side a logic low signal, we can expect VOLB = 0.52V typical.

Regards,

Tyler

0 user4961418 over 1 year ago in reply to Tyler Townsend

Prodigy 190 points

この電圧はI2C規格として良いですか? もう少し電圧を下げる方法はありますか?

0 Tyler Townsend over 1 year ago in reply to user4961418

TI__Guru 55148 points

User4961418,

I believe you asked the question:

"The I2C specification of the engineering machinery provides the required data in the medium term. How can we predict the way in which we work?"

I am not sure that I understand your question. Can you restate your question?

Regards,

Tyler

0 user4961418 over 1 year ago in reply to Tyler Townsend

Prodigy 190 points

Mr. Taylor, is this voltage suitable for the I2C standard? Is there a way to lower the voltage a little more? Regards,Taro

0 Tyler Townsend over 1 year ago in reply to user4961418

TI__Guru 55148 points

Taro,

The static voltage offset is not configurable to make lower. It is a set voltage between 0.45V and 0.6V.

As for the i2c standard, VIL = 30% of VCC. Technically the lowest voltage that can be used on the B-side is VCC = 3.3V. 1.8V logic cannot work on B-side due to static voltage offset. Also, minimum VCCB = 2.7V.

If 1.8V logic is need on B-side, try looking at lower voltage options such as the TCA9800 / TCA980x series of devices.

Regards,

Tyler

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TCA9517A:huguai