ASM330LHHX : RES pin

Gilles_FR · ‎2025-12-15

Hi

What is the function of the RES pins on the ASM330LHHX?
The datasheet indicates: “Connect to VDDIO or GND.”
Is there a preferred connection?
Can I add a 4.7 kΩ pull-up or pull-down resistor?

BR

Peter BENSCH · ‎2025-12-15

I suspect a typo and that instead of the ASM330LHHX, the ASM330LHH was actually meant, which has two pins labelled RES.

If this is correct, then pins 2 and 3 are REServed pins that must be connected to a static potential so that these inputs do not pick up interference signals. The static potential can be achieved most cost-effectively with a fixed connection using a wire to GND or VDDIO, but of course also with pull-up resistors.

Regards
/Peter

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TDK · ‎2025-12-15

What pin? I do not see any pins labeled RES in the datasheet.

RES means reserved in this context. Typically this means the pin has some internal use during testing/development which is not intended or published to the user.

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Peter BENSCH · ‎2025-12-15

I suspect a typo and that instead of the ASM330LHHX, the ASM330LHH was actually meant, which has two pins labelled RES.

If this is correct, then pins 2 and 3 are REServed pins that must be connected to a static potential so that these inputs do not pick up interference signals. The static potential can be achieved most cost-effectively with a fixed connection using a wire to GND or VDDIO, but of course also with pull-up resistors.

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Gilles_FR · ‎2025-12-15

Hi
Thanks

it was about the two pins labelled RES.
BR