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Analog Devices Inc. IoT Challenges Solved with Edge Devices addresses the challenges in Edge IoT sensor applications by enabling sensing at 1V and saves more than 40% of battery life. This solution allows designers to maximize application battery life while maintaining a high level of sensor accuracy. Two options are available to achieve this. First, keeping the sensor on to reduce the baseline sensor drift and enable a more accurate sensor reading, or second, putting the system into shutdown mode to save power. In both cases, the system will consume more power either by keeping the sensor on or during sensor startup.
Sensor systems will always shut-down/wake-up the MCU and BLE. The question is whether or not to shut down the sensor and analog signal chain. Electrochemical sensors usually do not shutdown because, during power-up, it takes several minutes or up to one hour for these sensors to “warm up” and get thermally stable to provide the specified accuracy. This is where having an op-amp like the MAX40108 with low current consumption is beneficial. It can be powered off the single-cell battery because its VDD can work as low as 0.9V. The op-amp and the sensor will always be on.
By using the MAX40108, a sub 1V operational amplifier with a low 25.5uA supply current and 1uV zero-drift input offset voltage over time and temperature, systems can maintain active sensors to optimize accuracy while maximizing the battery life of a single cell battery. Using the MAX40108 combined with the highly efficient nanoPower boost (MAX17220), precision voltage reference (MAX6018A) and ultra-low-power processor (MAX32660) enables Edge IoT applications to maintain a high level of accuracy while extending battery life.
MAX6018 Maxim Integrated Voltage References
