Power Measurements

The below figure is captured while the device is in Standby sleep mode running sleepwalking tasks. The larger spikes indicates the power profile for sampling using ADC and transferring the results using DMA. The time interval between two large spikes is measured to ~0.03 seconds, corresponding to a frequency of ~32Hz, which is the desired start ADC conversion rate. The smaller spikes are due to the buck regulator and a capacitor, which is periodically charging/discharging. In between the sleepwalking tasks the device is running the RTC in Standby sleep mode. The Window Average indicates an average current consumption of 1.7μA.

Figure 1. Data Visualizer Screen Shot