As IoT is increasingly integrated into our everyday life, the demand for different sensor modalities, especially imaging, is rising. IoT imagers are often compact and have small form-factor batteries and thus must be designed with both low power (improving battery life) and high image quality (maximizing utility). Previously reported sensors [1, 2], along with this work, adopt motion-detection (MD) triggering of full-array capture where MD is performed on a heavily subsampled frame to enable continuous low-power operation. MD limits energy-hungry full-array captures to cases where activity is detected. To further reduce power consumption, the full-frame capture energy itself needs to be addressed, which is typically dominated by the ADC.