The number of Internet connected devices is up to four times the global population, and the number of devices is still rapidly increasing. Internet of Things (IoT) enables businesses, groups and individuals to collect data over connected devices. Wearables such as activity monitors and smart watches are the most common IoT devices today. Wearable devices can monitor your activity and health by measuring activity levels and helping you adjust behaviors to improve your health. Other IoT devices collect data on vehicles, homes, businesses, and other assets on a similar principle to increase their utilization. IoT's thermostat increases heating and cooling efficiency.
Locks that connect to the Internet of Things can increase the security of your home or business. Sensors that are networked on the infrastructure can help cities anticipate failures and respond quickly when problems arise. Asset tracking helps with tracking and recycling of goods.
IoT devices need to be always powered. Although rechargeable batteries are gaining popularity, many IoT devices are still powered by primary batteries. Even if the device is primarily powered by an AC connection, a backup battery is often required to ensure that data can be collected or stored during a power outage. In addition, devices such as temperature sensors, humidity sensors, motion detectors and asset trackers need to keep moving. For these devices, you can also use a simple wireless charging solution.
Most IoT devices include sensor arrays, microcontrollers (MCUs), Bluetooth® or Wi-Fi radios, and power management. Some devices are also equipped with a monitor or button input. Figure 1 shows a typical block diagram.
Figure 1: Sensor Node Block Diagram with Display
The bq25120 is a highly integrated battery charge management solution that integrates the most common power management features for wearable devices and is also suitable for a wide range of IoT devices. The bq25120 includes a linear charger, regulated output, load switch or low-dropout regulator (LDO), timer manual reset, and battery voltage monitor. Key parameters configurable for the I2C interface include charge current, termination threshold, battery trim voltage, DC / DC regulated output voltage, load switch or LDO voltage, push button timer and reset parameters, input current limit, battery undervoltage threshold, safety timing Limitations, Battery Monitor Read and Fault Conditions.
The wearable device reference design with wireless charging reference design uses the block diagram shown in Figure 1 and can be shrunk to include only the functionality required for a particular IoT device. Starting with this reference design, powering IoT devices is straightforward.
Which IoT devices do you want to charge?
Other resources:
Watch the video: How can I design a smaller wearable device?
Watch the video: How to extend the battery life of wearable devices?
See the following reference design:
Low-Power Battery Charge Management Reference Design for Wearables and IoT Applications. Smart Watch Battery Management Solutions Reference Design.
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