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December 15, 2025
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ASM330LHHX : RES pin

  • December 15, 2025
  • 2 replies
  • 460 views

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

Best answer by Peter BENSCH

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

2 replies

TDK
Super User
December 15, 2025

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

TDK_0-1765824728261.png

 

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
Peter BENSCHBest answer
Technical Moderator
December 15, 2025

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

Gilles_FRAuthor
Associate
December 16, 2025

Hi
Thanks

it was about the two pins labelled RES.
BR