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AN4316 Datasheet(PDF) 11 Page - STMicroelectronics |
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AN4316 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 26 page DocID024847 Rev 2 11/26 AN4316 Tuning of the thresholds 25 4 Tuning of the thresholds This section provides recommendations on how to select reliable thresholds. Depending on application use cases, some recommendations will have to be adapted. Capacitive touch sensing applications are sensitive to earth coupling. The parameter tunning must be done in the same environment as the final application. The hardware tool connected to the application may change the earth coupling. This is especially true for example in battery power applications. ST is providing a galvanic insulated hardware tool (ST-Link/ISOL) to minimize this effect. 4.1 Use of a standard test finger In order to build an application working with the widest range of people finger characteristics, we propose to use a standard test finger which will give a worst case but also will allow to repeat the test without human dependency, such as finger size, pressure and contact area, skin conductivity, etc... To perform repeatable test, it is recommended to use an electrically conductive pen-shape tool with a flat rubber end. The flat end made of conductive rubber, allows to touch the touchkey with a constant contact surface. The operator performing the validation will take care to center the contact area on the touchkey. Additionally, it makes sense to plan a final validation with a panel of users. A picture of a standard finger is provided below. Figure 4. Standard 8mm diameter finger Refer to Appendix A for a recommended standard test finger. 4.2 Threshold definitions 4.2.1 Touchkeys thresholds To tune the detection thresholds, it is first necessary to determine the sensitivity of each touchkey. In order to do so: |
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