Wireless microcontroller that realizes low-voltage and highly efficient battery operation: "EFR32BG27"

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"EFR32BG27" wireless microcontroller expands battery-powered IoT applications

Silicon Labs' "EFR32BG27 (BG27)" is a wireless microcontroller that is ideal for battery-powered IoT devices.

The BG27 has a built-in step-up DC-DC converter (DCDC boost) for low-voltage, highly efficient energy conversion.

It can accommodate very small application sizes without sacrificing performance and security.

This time, we will introduce Silicon Labs' "EFR32BG27," which has great potential for realizing IoT.

Feature 1: Boost type DCDC converter

One of the features of the BG27 is that it has a built-in boost DCDC converter.

In addition to the step-down DCDC converter (DCDC Buck) implemented in Silicon Labs' conventional EFR32 series products, which enables operation at power supply voltages from 1.8 V to 3.8 V, the BG27 also has a built-in step-up DCDC converter (DCDC boost), allowing operation at power supply voltages from 0.8 V to 1.7 V and 1.8 V to 3.8 V.
This allows the BG27 to support the use of alkaline batteries or 1.5V coin cells.

Low voltage operation and highly efficient power conversion enable energy-efficient applications that conserve battery life and the environment.

Feature 2: Long-term storage (shutdown mode)

In addition to the device's own energy modes,
The BG27 (WLCSP package) features a special shutdown mode that is controlled by the external BOOST_EN pin.
Shutdown mode completely shuts off the DCDC boost, putting the device into a very low power consumption state (< 20nA).

This feature allows us to minimize battery consumption during months of storage or transportation.

Feature 3: Ultra-small WLCSP package

The BG27 ultra-small package WLCSP (wafer-level chip-size package) is
It provides a very small wireless solution without sacrificing performance or low power consumption.
With a size of 2.3 x 2.6 mm, the BG27 enables small and attractive device designs.

The compact design allows for additional space on the board for functions, memory and batteries, giving your product a competitive advantage.

Use Case: Connected Healthcare

The BG27 is the perfect device for connected health care.
For example, it has features that are beneficial for the design of CGM (continuous glucose monitoring).

One of the challenges faced with CGMs is preventing battery discharge during storage, as the power supply for the product is sealed.

Normally, in battery-powered products, a plastic tab is used to prevent the battery from discharging until it is started up, but since CGMs are generally sealed, this method cannot be used. Therefore, the shutdown mode in Feature 2 is provided as a way to prevent the battery from discharging during storage.

The reference design also uses a light sensor as a trigger, as a new way to wake up the device, for example by simply shining the light from a mobile phone on the device when using the product.

*CGM (Continuous Glucose Monitoring)
CGM is a medical device that constantly monitors the blood glucose levels of diabetic patients. The measured data is sent in real time via communication methods such as Bluetooth and stored in the cloud. Understanding fluctuations in blood glucose levels can help optimize treatment and enable doctors to manage the patient remotely. CGM is expected to bring about revolutionary developments in diabetes treatment.

Silicon Labs provides a white paper.
CGM Reference Design Based on BG27 Bluetooth LE Chip - Silicon Labs (silabs.com)