SLAA954 August   2020  – MONTH  TAS2563

 

  1.   Abstract
  2.   Trademarks
  3. 1End System Integration
    1. 1.1 Step 1: Exporting Binary and Configuration Files
    2. 1.2 Step 2: Configuration Selection
    3. 1.3 Step 3: Snapshot Selection
  4. 2Factory Test and Calibration (FTC)
    1. 2.1 Step 4: Pass/Fail Limits
    2. 2.2 Step 5: Configuration Summary
  5. 3Device Driver Integration
    1. 3.1 Case 1 : Initialization
    2. 3.2 Case 2: Power up
    3. 3.3 Case 3: New Configuration
    4. 3.4 Case 4: New Configuration and PLL
    5. 3.5 Case 5: New Configuration and Program
  6. 4Summary

2 Factory Test and Calibration (FTC)

Speaker parameters can vary from the vendor datasheet with a tolerance, and each speaker may vary from each other as well. This can lead to inaccurate speaker protection when one speaker model is used to fit all speakers. For this reason TI’s Smart Amp algorithms can be calibrated accordingly to each speaker variance to ensure proper and accurate function of speaker protection. The FTC is performed to calibrate the Smart Amp algorithm and protect the speaker from parameter variations. The FTC obtains the speaker Re, f0, Q, and voice coil temperature as seen below in step three of FTC Process shown below.

GUID-20200721-CA0I-4NX6-LP3H-0GN4CZ44RD4D-low.gif Figure 2-1 Factory Test Calibration Process.
These parameters are then compared against pass/fail limits defined by the customer in Step 4. Speakers that pass the parameter limits test will be configured with new calibrated model as seen in the last step of Figure 2-1. TI recommends to perform FTC on all units in order to ensure proper protection of each speaker unit. For information on how to implement the FTC in your system please refer to the TAS2555, TAS2557, and TAS2559 Factory Test and Calibration Guide. Figure 2-2 contains all of the parameters the calibration test can measure during each test. By setting the range of tolerable pass/fail limits, users can determine if the speakers under testing are suitable for the system.