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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2869 датащи(PDF) 22 Page - STMicroelectronics |
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AN2869 датащи(HTML) 22 Page - STMicroelectronics |
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22 / 43 page  Surface electrode design AN2869 22/43 Doc ID 15298 Rev 6 3.4 Rotary sensor A rotary sensor is a set of contiguous capacitive electrodes (placed in a circle) connected to the controller pins. It consists of a set of three, five or eight electrodes that can be interlaced, like the linear touch sensor. There are three kinds of rotary sensors: ● Normal patterned rotary sensors ● Interlaced patterned rotary sensors ● Rotary sensor with central touchkey 3.4.1 Normal patterned rotary sensor Figure 15. Normal patterned rotary sensor (three electrodes) 1. Legend: d is the diameter of the center, e is the gap between two sensor electrodes, w is the width of the sensor electrode, L is the length of the external perimeter of the sensor electrode. The dimensions d, e, w, and L of the three-electrode scheme above can also be applied for five and eight electrodes, thus giving a bigger rotor. 3.4.2 Interlaced patterned rotary sensors The three-electrode rotary touch sensor can be used for bigger rotary sensors with an interlaced pattern. This allows a smoother transition and a higher sensitivity. To cover a large range of sizes, more teeth are added inside the rotary touch sensor rather than increasing the size of an individual tooth. e <= 0.5 mm L = 10-12 mm d >= 5 mm w = 8-10 mm ai15089 |
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