Background of bluetooth low energy controller tws earbuds case

One of the biggest issues with wireless systems is how to calibrate and certify and perform performance testing on the production line, which is especially important for wireless systems that want to produce as cheaply as possible. Once a device is packaged into a module or product, it cannot be tested in seconds without the host protocol stack, as it would when it was first produced. Direct test mode solves the above problems by defining standard test procedures and hardware interfaces, even if the host protocol stack or other components are integrated with the device. www.bjbjaudio.com

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The device under test refers to the controller, module or final product that needs to be tested. The device under test needs to have an antenna, and a universal asynchronous serial communication interface (UART hereinafter referred to as serial port) or a host/controller interface (HCI) connected to the upper test equipment. The host test equipment is usually produced by the test equipment manufacturer. Its software can drive the device under test through the serial port or host/controller interface, and can also drive and communicate with the lower test equipment. The lower test equipment can send and receive messages and communicate effectively with the equipment under test through the antenna. The device under test is told what to do by the upper test device, and executes message sending and receiving. At the same time, the upper test equipment notifies the lower test equipment to do the opposite operation, that is, to perform message receiving and sending. That is to say, the device under test will exchange messages with the lower-level test device. At the end of the test, the upper test device can judge whether the device under test passes the test through the valid information of the device under test and the lower test device, such as the message counter of the device under test and the richer information of the lower test device.
The upper test equipment can also calibrate the controller on the production line by asking the equipment to send a message with a known frequency and measuring the actual transmission frequency. Typically, this is required when the external crystal used for the clock reference differs from its design frequency. This fine-tuning of the crystal frequency is done when the controller sends a message, allowing for quick component calibration. www.bjbjaudio.com      <a style="opacity:0.0;color:#ffffff">tws earbuds case</a>             <a style="opacity:0.0;color:#ffffff">tws earbuds case</a>

Transceiver Test
In order to test the transceiver controller will be required to send or receive messages. It is up to the tester to decide when the DUT controller sends a message. The tester attempted to receive these packets and extract various physical layer characteristics from them. For example, the lower test equipment can obtain the frequency drift of the device under test in this way. It is also up to the tester to decide when the DUT controller receives the message. The tester sends a certain number of packets and the device under test counts the correctly received packets. at the end of the test. This count information will be reported to the upper test equipment. In this way, the tester can know the reception performance of the receiver under the condition of a given number of transmitted messages. www.bjbjaudio.com

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