Analyze tips for extending battery life in portable industrial measurement applications

Tips for extending battery life in portable industrial measurement applications Battery life is essential for portable use. Like smoke detectors, safety equipment, and thermostats, factory-processed batteries can last up to 10 years. Therefore, extending the number of battery life has become a key component of the portable use plan. To maximize battery life, planners need to minimize the uniform current consumption of the system. In order to achieve this goal, it is very important to choose a variety of low-power operation modes and appropriate components. Regarding low-power operations, including shutdown mode and real-time clock standby mode. Its important components include: single chip microcomputer, power supply and signal link components. Because MCUs vary in cost, peripheral equipment planning, CPU architecture, and on-chip resource integration, choosing the best MCU for a specific purpose becomes more challenging. In terms of portable industrial measurement, to choose the most suitable MCU, priority must be given to key requirements, such as longer battery life, high-performance analog peripherals and rich user interfaces. Here are some suggestions on how to achieve the maximum battery life planner. It should be 1. Try to minimize current consumption in standby mode. In many portable applications, the idle time of the CPU exceeds 99%. In this case, the current consumption will gradually transition to the casual mode, the user can choose to enter the form of complete shutdown, or wait for the external pause until being awakened, or use the timer for real-time clock operation. 2. Select the MCU with the shortest wake-up time. The operating consumption of the MCU is currently the largest. During the wake-up process of the single-chip microcomputer, that is, entering the working state from the idle state, the working state value of the CPU is much higher than the current working state value. Therefore, planners should consider using mcu to wake up and code as soon as possible. Generally speaking, we mean the time between the time a pause occurs and the clock returns to its fast and stable operation as the wake-up time. In the figure, the suspended wake-up time of Texas Instruments MSP430F20x1 is less than 200 nanoseconds. 3. Select low-power brown-out reset (BOR) protection. Any portable device needs BOR or low voltage detection to ensure that the system can automatically reset when the power supply voltage is lower than the specified value. Many MCUs provide under-voltage protection, but the rated current consumption is increased by 20 to 70 microamps. Since this protection function must always be in operation, planners should consider using a low-power BOR function. For example, TI's MSP430 16-bit microcontroller has zero power consumption protection. 4. Improve integration as much as possible. Some MCU integration features eliminate the need for high-resolution A/D, operational amplifiers, and 12-bit D/A boards. These integrated functions can be used for register communication, thereby replacing serial communication with more current consumption. Any components added to the circuit board will cause an increase in leakage current. Shouldn't 1. Only select an MCU based on a standard homepage information. Planners must carefully read well-maintained data sheets and pay attention to the worst-case operating temperature, limit parameters, and operating voltage. 2. Take it for granted that the MCU operation form of different vendors is the same. In fact, the current cost of MCUs varies from vendor to vendor. For example, MCU vendors may not provide all functions that are common under given operating conditions. 3. Choose a variety of power sources. Some plans require multiple or confusing power sources. Because in most cases, the power supply is continuously working, the cost of using a low-voltage differential regulator or boost converter may be high, because it not only adds cost, but also leads to greater uniform current consumption. Consider using a 3V power supply. 4. Select polling monitoring. Some MCUs advocate infinite loops so that you can traverse all the peripheral devices you want to monitor. This is an inefficient method that will increase the CPU load and increase the current consumption. Consider using an MCU with excellent termination support. For example, some low-power MCUs have abort vectors that support up to two 8-bit ports, while other MCUs support very little I/O. 5. CPU abuse. A common requirement is to read the user manual carefully to ensure that the features offered by the MCU are fully utilized. It is important to realize that every line of useless code you execute will waste some battery power. A low-power MCU should have hardware features to keep the CPU off, while peripherals perform specific tasks that do not require any processing. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How should low-temperature lithium batteries be used?