BLE Voice

Introduction The BLE function of the KT1025A Bluetooth chip supports connection passcodes. By default, the passcode is fixed at 6 digits , and its length cannot be changed. In the default program, the passcode is set to 123456 . Please note that each digit must be in the range 0–9 and must not exceed this range. However, it is important to note a limitation of BLE : even with a passcode set, certain apps may bypass it. Therefore, it is recommended to implement an interactive encryption mechanism between your app and the Bluetooth chip after a connection is established. For example, after a successful connection, the app can send a data frame to the Bluetooth chip, which then parses and replies according to a predefined protocol. If no correct reply is received, the device can be considered unauthorized. AT Command Instructions Set the passcode Command:  AT  +BN  Format:  AT  +BN[passcode]  (up to 6 digits) Example:  AT  +BN8...

Special Notes: The input voltage on the VBAT power pin must not exceed 5.0V. The voltage on the LDO_IN charging input pin must not exceed 5.5V. A capacitor placement to ground must be reserved for LDO_IN.For speakers or headphones using the internal soft power-on/off solution, please use the PBI pin (low-level wake-up) for the power button. To ensure product safety and reliability, please use batteries with protection circuits. Test points must be provided for the programming pins (VBAT, USBDM, USBDP, VDDIO, VSSIO). Note: The QFN package chip is small, which is not conducive to programming via test fixtures or manual methods. It is recommended to first mount the chip, then program it via PC. 1. Circuit Design Guide 1.1 Crystal Oscillator Selection Guide Due to Bluetooth's high requirement for frequency offset, the quality of the crystal oscillator is crucial for Bluetooth performance. Consistency and stability of the crystal oscillator must be ensured during selection. The frequenc...

During the development of Bluetooth smart speakers using Jieli's AC696N series SoCs, developers may encounter several common issues. This article summarizes these problems and provides corresponding solutions to help streamline the development process. 1. AC696N V1.7.0: Unable to Display SDK Version Number via Test Box When TWS is Enabled Problem Description: After enabling TWS (True Wireless Stereo) in AC696N V1.7.0 SDK, the test box cannot display the SDK version number. Solution: Register a new callback function to handle the SDK version information request. // Re-register a callback function bt_testbox_ex_info_get_handle_register(TESTBOX_INFO_SDK_VERSION, user_bt_get_sdk_ver_info); // Callback function example: u8 user_bt_get_sdk_ver_info(u8 len) { y_printf("Getting version number\n"); const char *p = sdk_version_info_get(); if (len) { *len = strlen(p); } log_info("sdk_ver:%s %x\n", p, *len); return (u8 *)p; } After Modification: The SDK version numb...