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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STMPE16M31PX датащи(PDF) 48 Page - STMicroelectronics |
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STMPE16M31PX датащи(HTML) 48 Page - STMicroelectronics |
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48 / 75 page  Touch sensor controller STMPE16M31PX 48/75 Doc ID 17058 Rev 2 Figure 12. Touch sensing module flowchart 13.1 Sampling rate calculation The capacitive sensor operates with a 2 MHz base clock, a single capacitive sensor scans up to 16 active channels. The SCLK_DIV divides the sensor clock by 32-1024, giving 2 kHz-67.5 kHz sensor clock. For capacitive sensing, a PRBS sequence is utilized to remove the effect of surrounding noise. This PRBS has an average value of 4.5. The effective total sampling rate is thus 2 kHz-67.5 kHz divided by 4.5, giving 440 Hz – 14 kHz. If all 16channels of capacitive sensors are active, the channel conversion rate is thus 440 Hz/16 = 27.5 Hz (Min), 14 kHz/16 = 875 Hz (Max) Using the maximum MAF setting (18 remove 2), the maximum filtered channel output rate is 875 Hz/18 = 48.6 Hz. Obsolete Product(s) - Obsolete Product(s) |
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