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HEMANTH.S
HEMANTH.S
Explorer II
November 29, 2023
Solved

Input pin capacitance of ASM330LHH

Hi Team,

I would like to know the input capacitance for the pins (specifically for I2C pins) of the ASM330LHH IMU sensor.

HEMANTHS_0-1701255996251.png

 

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Federica Bossi
Federica BossiBest answer
ST Technical Moderator
December 1, 2023

Hi @HEMANTH.S ,

 

We don't provide the exact value but certainly it must not exceed the specification capacity limits found in the literature, for example in this document.

However, it is not recommended to put capacitances on the I2C lines. Indeed, the capacitance creates with the resistor an RC filter which attenuates the clock front, and by increasing the capacitance, the clock may no longer a square wave, and the I2C stops working.

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1 reply

Federica Bossi
Federica BossiBest answer
ST Technical Moderator
December 1, 2023

Hi @HEMANTH.S ,

 

We don't provide the exact value but certainly it must not exceed the specification capacity limits found in the literature, for example in this document.

However, it is not recommended to put capacitances on the I2C lines. Indeed, the capacitance creates with the resistor an RC filter which attenuates the clock front, and by increasing the capacitance, the clock may no longer a square wave, and the I2C stops working.

If my reply answered your question, please click on Accept as Solution at the bottom of this post. This will help other users with the same issue to find the answer faster

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question.
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