Hello everyone,
We are using the HSCMP peripheral of the LPC5536 primarily to monitor a slow voltage. We configured HSCMP2 for "Nano Power Comparison," along with the DAC sub-module. However, we are experiencing instability with the output of HSCMP2, which oscillates. The duty cycle of the oscillation appears to depend on the voltage of the negative input, leading me to suspect that the positive input—the DAC signal—is not stable.
When changing the power mode to "Low Speed Comparison," the oscillation issue is resolved.
Additionally, my colleague has encountered similar problems with HSCMP0 and HSCMP1. He requires switching to "High Speed" mode for stable operation, but another PCB does not function properly with this setting.
Has anyone else faced similar issues? Is there a reliability concern with the internal HSCMP? What steps can we take to achieve stability?
Thank you for your input!
