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STMPE16M31PX bảng dữ liệu(PDF) 48 Page - STMicroelectronics

tên linh kiện STMPE16M31PX
Giải thích chi tiết về linh kiện  S-Touch® 16-channel touchkey controller with proximity sensing
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STMPE16M31PX bảng dữ liệu(HTML) 48 Page - STMicroelectronics

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Touch sensor controller
STMPE16M31PX
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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.
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