LID43.03 | EMG | External touch sensor module

Description

LID43.03 | EMG | External touch sensor module

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This diagram clearly illustrates the voltage changes of positive and negative charging and discharging.
1. LID43.03 (red) charges to VDD, and CPAD (blue) discharges to Vss stage.
2. The stage of CHOLD discharging to CPAD
During the stage of balancing large and small reservoirs, ADC begins to transition
4. Negative pre charging begins, CPAD charges to VDD, CHOLD grounds and discharges the charge to 0 V.
5. Perform ADC conversion after balancing the charge taken from CPAD to CHOLD discharge

In the waveform diagram of LID43.03, the difference voltage between the conversion voltage value at VB point and the voltage value at VA conversion point Δ V can determine whether there is a button. The waveform shown in this figure is with and without buttons, and it can also be seen that Δ The difference in V voltage. By using this detection method to determine whether the touch button has been pressed, a larger difference can be obtained, greatly improving the stability of the touch. For greater efficiency, when the ADC converts the internal sampling capacitor (LID43.03), the software immediately switches to the parasitic capacitor of the Pad to start pre charging. This pre charging method can accelerate the scanning time of the touch button without affecting its accuracy.
The above is the simplest explanation of the principle of CVD. It seems that as long as there is ADC, CVD measurement can be done.
In fact, as long as there is a built-in 10-bit ADC MCU, whether it is an 8, 16, or 32 bit MCU, it can achieve the function of software CVD.

Mailbox：sauldcsplc@gmail.com |LID43.03
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