https://community.nxp.com/t5/Sensors/MMA8451Q-Accelerometer-Not-Responding-I2C-Communication-Error/m-p/2119253#M8858 <P>Hi,<BR />I'm working with the MMA8451Q accelerometer on an NXP development board, and I'm facing an issue where the sensor is not responding over I2C.</P><P>I’ve double-checked the wiring and pull-up resistors, and I'm using the correct I2C address (0x1D). However, I keep getting a NACK on every read attempt.</P><P>Has anyone faced a similar issue with this sensor? Could it be a power or initialization problem? Any suggestions or troubleshooting tips would be greatly appreciated.</P><P>Thanks in advance!</P><P><FONT face="courier new,courier" size="1 2 3 4 5 6 7" color="#000000"><A href="https://www.igmguru.com/data-science-bi/data-science-with-python-training-in-mumbai" target="_self">Python mumbai</A></FONT></P> Tue, 03 Feb 2026 21:24:10 GMT miasmith 2026-02-03T21:24:10Z https://community.nxp.com/t5/Sensors/MMA8451Q-Accelerometer-Not-Responding-I2C-Communication-Error/m-p/2119253#M8858 <P>Hi,<BR />I'm working with the MMA8451Q accelerometer on an NXP development board, and I'm facing an issue where the sensor is not responding over I2C.</P><P>I’ve double-checked the wiring and pull-up resistors, and I'm using the correct I2C address (0x1D). However, I keep getting a NACK on every read attempt.</P><P>Has anyone faced a similar issue with this sensor? Could it be a power or initialization problem? Any suggestions or troubleshooting tips would be greatly appreciated.</P><P>Thanks in advance!</P><P><FONT face="courier new,courier" size="1 2 3 4 5 6 7" color="#000000"><A href="https://www.igmguru.com/data-science-bi/data-science-with-python-training-in-mumbai" target="_self">Python mumbai</A></FONT></P> Tue, 03 Feb 2026 21:24:10 GMT https://community.nxp.com/t5/Sensors/MMA8451Q-Accelerometer-Not-Responding-I2C-Communication-Error/m-p/2119253#M8858 miasmith 2026-02-03T21:24:10Z https://community.nxp.com/t5/Sensors/MMA8451Q-Accelerometer-Not-Responding-I2C-Communication-Error/m-p/2119350#M8859 <P>Hi Mia,</P> <P>please share your schematic with voltage levels and part values. Please let me know your required I2C communication speed and approximate length of the SDA, and SCL PCB traces and/or cables.</P> <P>Please share a scope with the SDA and SCL lines.</P> <P>With Best Regards,</P> <P>Jozef</P> Thu, 19 Jun 2025 10:58:34 GMT https://community.nxp.com/t5/Sensors/MMA8451Q-Accelerometer-Not-Responding-I2C-Communication-Error/m-p/2119350#M8859 JozefKozon 2025-06-19T10:58:34Z