Simplifying Design in True Wireless Stereo Control

After the advent of true wireless stereo (TWS), it is becoming more and more popular in the personal electronics market. Excluding the traditional wired audio transmission technology, TWS using Bluetooth technology to achieve wireless transmission, greatly improving the user experience. In addition to being easy to wear, a smart phone can provide rich functions such as audio control, volume adjustment, and noise reduction. TWS system introduction As Figure 1 shows, the TWS consists of a storage box and two earbuds. The box is used to store and charge the earbuds and control the status of TWS. The earbuds are mainly in charge of communication with the user to achieve information interaction. The ear buds consist of a charger, gauge, Bluetooth SOC, and sensors. These components play the role of charging and monitoring the battery, interaction, and signal detection. The TWS box is the reserve energy of the earbuds and manages the power system of the TWS when the earbuds are stored in the box. Why is MSPM0 suitable for TWS application? TI's scalable MSPM0 MCU portfolio features an Arm® Cortex®-M0+ core. The low-cost family with a maximum CPU speed of 32 MHz with 32-bit structure improves the processing ability of the MCU. The wide operation voltage from 1.62 V to 3.6 V allows use in low-voltage and low-power applications. 5-V tolerant I/O pins are needed for high voltage detection. For a long battery life, the MSPM0 has several low-power modes to save battery energy in TWS application. The standby mode consumes less than 1 µA. The smallest package of the 16-pin MCU is a 3-mm × 3-mm QFN with 4KB to 64KB flash memory with a pin-to-pin replacement option. A 12-bit fast SAR ADC with up to 4-Msps sample rate is integrated. 14-bit resolution is supported with oversampling technology for high precision in a gauge algorithm. Diverse peripheral communication interface like UART, I2C, and SPI are available.