In practice, engineers choose two ways of tuning the Charge Phases of a touch sensor:
The first way is the ‘firmware-tuning way’, in which the engineer configures the duration of the Charge Phases through firmware and then measures if the sensor(s) is fully charged and discharged. If the measured voltage reaches the desired voltage, then the charge transfer is ideal and it works.
If the measured voltage does not reach the desired voltage, the charge transfer is non-ideal and the Charge Transfer period needs to be adjusted, potentially together with other parameters as well. Although the above process is considered a trusted way for engineers to configure the controller, it creates a lengthy procedure with multiple lab measurements that might result in configuring the controller in a functional but sub-optimal way.
The second way is the ‘simulation way’, where the engineers identify the Charge Time values of the touch sensor by simulating the operational parameters of a touch system that determine its performance. Knowing the Charge Time values, it will allow the engineer to determine the Charge Phase parameter in controller’s firmware. Below we will explain the process for identifying the Charge Time in a touch sensor using simulation.
You can read more about how to identify Charge Time in a touch sensor using simulation HERE.