TSC2013-Q1: Single-touch or Dual-touch detection

Hi Goto,

The detection of single and dual touch is a calculation done by the host processor when measuring the resistance change on the two-layer panel. So yes, the customer can make provisions to detect a single touch. This is explained in section 8.2.2 of the datasheet.

Hi Daveon,

Thank you.

Reading the data sheet, the TSC2013 outputs the resistance value between the two panels. The host processor seems to distinguish between single/dual touche by determining whether this resistance value is above or below the threshold.
In other words, TSC2013 does not output a signal identifying the single/dual.

Is this my understanding correct?

Best regards,
Goto

Apologies for the delay, I will update this thread tomorrow.

Hi Daveon,

Thank you for your support.
Do you have any update?

Best regards,
Goto

I apologize for the delay, your understanding is correct. The user will have to collect resistance data based on single touch and dual touch profiles to accurately distinguish between the two

Hi Daveon,

Thank you.

Customers are concerned about single-touch and dual-touch false positives.
Will the resistance value output by the TSC induce false positives around the threshold value? Is this taken care of?

Hi Goto,

The resistive touch screen has two ITO layers which are located apart from each other to detect against false positives.

When the user uses a single-finger touch, only a minor parallel connection occurs between these two layers

Hi Daveon,

Customers are evaluating the TSC2013 EVM by connecting it to their touchscreen.
In other words, the resistance value is that of the EVM.
At this time, it has been confirmed that a single touch is detected even though the dual touch is being used.

What do you think is the cause of this?

Best regards,
Goto

Apologies for the delay, does the customer have Rsense implemented in their schematic? 

To detect two touches, add an external R(SENSE) resistor as shown in Figure 14. The value of R(SENSE) depends on the touch-panel resistance. The ratio between the lowest touch-panel resistance and R(SENSE) should be approximately 4.5.

Hi Daveon,

The customer use TSC2013EVM and there is Rsense.

Then, what is the cause of this mis detection? Do you have any idea?

Best regards,
Goto

Hi Shuhei,

A couple of factors can attribute to false touch detection, can you share your schematic to help troubleshoot