https://community.nxp.com/t5/Digital-Signal-Controllers/SC18IS604PWU-No-Interrupt-Signal/m-p/2150792#M3805 <P>&nbsp;</P><P>I am writing to request assistance regarding an issue with your <STRONG>SC18IS604PWU</STRONG> SPI-to-I2C converter.</P><P>The core problem is that the converter is not asserting the interrupt signal from the I2C_INT pin, even after being properly initialized via the SPI bus. Consequently, our DSP is not triggered to initiate I2C communication.</P><P>I have performed the following troubleshooting steps:</P><UL><LI><P><STRONG>Software Verification</STRONG>: I am using the exact same firmware that operates correctly on an older, functional version of our board, where the converter generates the interrupt signal as expected.</P></LI><LI><P><STRONG>Hardware Inspection (New Board)</STRONG>:</P><UL><LI><P><STRONG>Continuity Check</STRONG>: I have verified the continuity of all SPI and interrupt signal traces with a multimeter. All connections are sound.</P></LI><LI><P><STRONG>Signal Measurement</STRONG>: Using an oscilloscope, I have probed the I2C_INT pin directly on the converter and observed no activity whatsoever (no falling edge).</P></LI><LI><P><STRONG>Input Signals</STRONG>: I have confirmed that the VCC and RESET pins of the converter are operating correctly. I have also verified that the incoming SPI signals (SCLK, MOSI, and CS) are present and correct, matching the signals on the working board.</P></LI></UL></LI></UL><P>Since the component functions correctly on an older board with the same software, but fails on a new board despite extensive hardware verification, I suspect a potential component manufacturing issue or a subtle timing-related problem that is not immediately apparent.</P><P>I can provide the relevant schematics and oscilloscope captures of the working board's operation if necessary.</P><P>Any guidance you can provide to help resolve this issue would be greatly appreciated.</P> Tue, 12 Aug 2025 09:20:26 GMT drormoshe 2025-08-12T09:20:26Z https://community.nxp.com/t5/Digital-Signal-Controllers/SC18IS604PWU-No-Interrupt-Signal/m-p/2150792#M3805 <P>&nbsp;</P><P>I am writing to request assistance regarding an issue with your <STRONG>SC18IS604PWU</STRONG> SPI-to-I2C converter.</P><P>The core problem is that the converter is not asserting the interrupt signal from the I2C_INT pin, even after being properly initialized via the SPI bus. Consequently, our DSP is not triggered to initiate I2C communication.</P><P>I have performed the following troubleshooting steps:</P><UL><LI><P><STRONG>Software Verification</STRONG>: I am using the exact same firmware that operates correctly on an older, functional version of our board, where the converter generates the interrupt signal as expected.</P></LI><LI><P><STRONG>Hardware Inspection (New Board)</STRONG>:</P><UL><LI><P><STRONG>Continuity Check</STRONG>: I have verified the continuity of all SPI and interrupt signal traces with a multimeter. All connections are sound.</P></LI><LI><P><STRONG>Signal Measurement</STRONG>: Using an oscilloscope, I have probed the I2C_INT pin directly on the converter and observed no activity whatsoever (no falling edge).</P></LI><LI><P><STRONG>Input Signals</STRONG>: I have confirmed that the VCC and RESET pins of the converter are operating correctly. I have also verified that the incoming SPI signals (SCLK, MOSI, and CS) are present and correct, matching the signals on the working board.</P></LI></UL></LI></UL><P>Since the component functions correctly on an older board with the same software, but fails on a new board despite extensive hardware verification, I suspect a potential component manufacturing issue or a subtle timing-related problem that is not immediately apparent.</P><P>I can provide the relevant schematics and oscilloscope captures of the working board's operation if necessary.</P><P>Any guidance you can provide to help resolve this issue would be greatly appreciated.</P> Tue, 12 Aug 2025 09:20:26 GMT https://community.nxp.com/t5/Digital-Signal-Controllers/SC18IS604PWU-No-Interrupt-Signal/m-p/2150792#M3805 drormoshe 2025-08-12T09:20:26Z https://community.nxp.com/t5/Digital-Signal-Controllers/SC18IS604PWU-No-Interrupt-Signal/m-p/2151065#M3806 <P>Hello drormoshe</P> <P>Good day!</P> <P>Yes please, it would be very helpful to see your schematic and capture of your communication signal and I2C_INT</P> <P>I will be waiting for your response</P> <P>Have a great day and best of luck.</P> Tue, 12 Aug 2025 17:56:47 GMT https://community.nxp.com/t5/Digital-Signal-Controllers/SC18IS604PWU-No-Interrupt-Signal/m-p/2151065#M3806 RafaR 2025-08-12T17:56:47Z