https://community.nxp.com/t5/Sensors/MMA8451QR1/m-p/1755797#M7702 <P>Is there a block diagram for the pin structure of the INT pins?&nbsp; Are they OD or totem pole? If there are internal PU/PD resistors what are the values?</P><P>I am trying to understand if there is a backfeed path from INT1 or INT2 back to VDD or VDDIO when VDD/VDDIO are high impedance and there is an external voltage on INT1 or INT2.</P><P>What kind of current can be tolerated in this condition?</P> Tue, 03 Feb 2026 20:52:24 GMT thipp 2026-02-03T20:52:24Z https://community.nxp.com/t5/Sensors/MMA8451QR1/m-p/1755797#M7702 <P>Is there a block diagram for the pin structure of the INT pins?&nbsp; Are they OD or totem pole? If there are internal PU/PD resistors what are the values?</P><P>I am trying to understand if there is a backfeed path from INT1 or INT2 back to VDD or VDDIO when VDD/VDDIO are high impedance and there is an external voltage on INT1 or INT2.</P><P>What kind of current can be tolerated in this condition?</P> Tue, 03 Feb 2026 20:52:24 GMT https://community.nxp.com/t5/Sensors/MMA8451QR1/m-p/1755797#M7702 thipp 2026-02-03T20:52:24Z https://community.nxp.com/t5/Sensors/MMA8451QR1/m-p/1756101#M7707 <P>Hello Terry,</P> <P>The INT pins can be configured using the PP_OD bit to be push-pull (PP_OD = 0 - default) or open drain (PP_OD = 1).</P> <P>The polarity of the INT pins can be configured using the IPOL bit. The default value is active low (IPOL = 0) meaning any interrupt event is signaled with a logical 0.</P> <P>PS: Note that the MMA8451QR1 is in “End of Life” status and we recommend either the FXLS8974CF or FXLS8967AF as a replacement.</P> <P>BR, Tomas</P> Mon, 13 Nov 2023 08:02:23 GMT https://community.nxp.com/t5/Sensors/MMA8451QR1/m-p/1756101#M7707 TomasVaverka 2023-11-13T08:02:23Z