Multifunctional TWS headset charging case solution based on Qualcomm QCC3056 and Richtek RT6160A

In recent years, the Bluetooth TWS headset market has developed rapidly, and new products have emerged one after another. Users are increasingly demanding on the matching charging boxes. They no longer require them to be just simple power banks. Therefore, the charging boxes also have various functions.

Recently, Quan Ding launched a smart charging box solution based on the Qualcomm platform. In addition to meeting basic needs, it provides rich expansion functions to bring better experience to users.

This solution uses Qualcomm QCC3056 chip as the main control platform, and uses Richtek RT6160A power chip to build a low-power and high-efficiency charging platform. In terms of software, Qualcomm's dedicated charging communication protocol provides rich applications. When used in combination with headphones based on Qualcomm Snapdragon Sound S5 S3 platform, it can be said that they complement each other.

Function Introduction

What is Case Comms?

Charging box communication refers to Qualcomm's special design for using the charging interface as a transmission method between the charging box and the headset. It supports multiplexing of application-specific protocols. It supports serial port communication with the PC end and can identify AT commands and forward them to the headset end for response.

Mainly for two user scenarios

First, the end user can interact with the earphones to provide the intelligent functions of the charging box, such as ear-to-ear communication without Bluetooth link; load balancing of the two earphone batteries when charging; and the charging box can quickly control the earphones to enter pairing, reset and other states.

Second, customers can perform basic debugging and configuration on the final product state. For example, if the production line cannot provide USB and TRB interfaces, the product needs debugging and configuration; it can be used as a transmission interface for product testing.

Currently, Qualcomm has launched two communication protocols, Scheme A and Scheme B. Version A has been clearly eliminated, and only version B will be used in the future. Scheme B allows higher bit rate communication between the charging box and the two earphones at a rate of up to 1.5Mb/s. It works by briefly pausing charging and using the VCHG line to communicate at a lower voltage, avoiding the requirement for current sensing circuits and allowing higher data rates.

Charging box communication topology diagram

Headphone charging communication protocol stack

Scheme B Typical communication process

►Scenario application diagram

► Display board photos

►Solution Block Diagram

►Core technology advantages

1. Support ear-to-ear pairing in the headset compartment, mobile phone pairing, synchronization of pairing information in the compartment, and automatic pairing when the cover is opened.

2. Supports ear-to-ear communication without Bluetooth connection.

3. Support OTA upgrade, two-way upgrade application is free.

4. Support in-warehouse equipment testing mode to facilitate production line operation.

5. Support headset shipping mode to significantly reduce standby power consumption and avoid running out of power during shipment.

6. Support extended commands and customized differentiated functions.

7. Support Linein and USB input.

►Solution Specifications

1. Support BT5.3 protocol

2. Use WLCSP small package

3. Ultra-low standby power consumption

4. Rich peripheral interfaces

FAQ (Please visit Dadatong)

1.What headset solutions can be supported?

2.Can other chips be used as the main controller of the charging box?

3. Can it support customer extension commands?

4.Can the charging box be used as a USB dongle?

5. How complete is the plan?