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AN4299 Datasheet(PDF) 10 Page - STMicroelectronics |
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AN4299 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 20 page Test set up proposal to detect worst case AN4299 10/20 DocID024663 Rev 2 3.2 Generator settings 1. Select “sine wave” and “sweep” mode. 2. Sweep menu: time = 300 sec, return time = 0, linear, interval = 1 ms 3. Set Vpp value on the generator to obtain the corresponding voltage injected on the EUT in case of standard test. Example: to test in the same condition as the standard at 3 Vrms, you must adjust the generator voltage to inject 15 Vpp measured on the board with oscilloscope. Note: On AFG3102 TEKTRONIX generator, the modulation is not available in sweep mode. 4. Set the start and end frequencies such that the sweep range does not exceed 60 kHz for a 300 seconds duration. This recommendation allows to detect worst case level with sufficient accuracy (typically less than 5 % error). Note: An external amplifier might be needed in case the generator would not able to reach the appropriate injection level. 3.3 Data logging and data processing Data logging The STMStudio(a) tool log function can be used to collect data from variable. Example: “MyChannels_Data[x].Delta” and “MyTKeys[(x)].p_Data->StateId” Data processing A graphical tool is recommended for analysis of the results. For example with Microsoft® Excel® 2D you can obtain the chart shown in Figure 5. In this example frequency sweep starts at 500 kHz and ends at 550 kHz. Noise level is set on the generator to 4.6 Vpp (no modulation). Detect out threshold is set to 50, the sensor is touched and the detection is valid if measured delta is upper 50 else the touch detection is lost (error is reported). It means that 4.6 Vpp is the limit to avoid detection loss (4.5 Vpp pass) As a comparison, IEC61000-4-6 standard recommendation to use 1 % frequency steps would have lead to explore only ten frequencies in this range, so the chances to detect worst case would have been very low! a. STMStudio: order code STM6STUDIO |
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