Average power consumption refers to the average power consumption of the touch panel system. It includes the working time of the controller (scanning, processing, communication, sleep, etc.) and the time for the main processor to receive and interpret touch data. Power consumption is a very common performance parameter. In terms of power consumption of the touchscreen, there require a more precise calculation formula. Because different usage modes will produce different power consumption. The standby time of the mobile phone depends on the current consumed in the standby or sleep mode of the touch screen.
When the touchscreen is working, it can be divided into many modes. For example, wake on touch (WOT), cheek detection (Cheek Detect). For example, when answering a 5min call, while viewing or entering the phone number. The phone may switch to the touch mode for 10s, and then switch to the WOT or cheek detection mode that reminds the call. Even when sending text messages (SMS), the hybrid WOT mode is still in contact with the actual finger. When key input or thinking, the controller will switch between various sleep modes.
If these power consumption modes are not considered, it is easy to be misled by the power consumption of the system. In most cases, the touch panel is switched to cheek detection mode and touch wake-up mode 90% ~ 99% of the time. Some systems allow users to set the ratio of processing time to sleep mode, even when the finger is still on the panel. If the system only detects that the finger is placed in the same position, it does not need a picture update rate of 200MHz. To develop a high-performance touchscreen, a low-power system in sleep mode must be used. And work with innovative sleep and wake-up modes.
When designing a capacitive touch panel system, system developers must consider many other important factors.
Finger capacitance refers to the capacitance measured between the finger and a single sensor component. When measuring finger capacitance, Wuse a real finger instead of a metal mechanical finger. To ensure that the measured data is in line with the actual situation. The factors that affect the feedback capacitance (CF) include the thickness of the lens covering the upper layer and the dielectric constant of the material covering the outer layer.
The system noise floor refers to the noise measured at the output of the capacitor-to-digital converter. It is the input (capacitance) value of the data converter.
The signal-to-noise ratio (SNR) is the ratio of the finger signal measured by the sensor to the measured noise. This is an important parameter, and the designer must have a deep understanding of it. In order to develop a high-efficiency touchscreen. The system must be able to adjust, adapt and filter out parasitic noise in the mobile system. In order to obtain high signal and very little noise, consider the use of accurate analog front-end components for the touch panel function.
Products such as the True Touch series of programmable solutions. It provides many excellent mechanisms for filtering noise. PSoC programmable analog components can be reconfigured to integrate signals that last for a period of time to filter out noise.
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