Support Panel resistance spec. of TSC2046E

Patrick Chen

Mastermind 8875 points

Other Parts Discussed in Thread: TSC2046E

Hello,

The touch panel resistance spec. are below

X=700~2200ohm

Y=30~350ohm

Can TSC2046E support above X/Y resistance of panel that will be no problem? Thank you.

Patrick

over 11 years ago

0 Andy Liu (BMS) over 11 years ago

TI__Guru 52115 points

Hi Patrick,

If resistance for X layer seems ok, however the resistance for the Y layer is a bit low. The total resistance of each layer varies from vendor to vendor, but typical screens are in 200 Ohms to over 10k Ohms. As for as I know, if the resistance between Y+ and Y- is quite low, the on-resistance of the Y drivers will cause some error (The on-resistance of switch drivers are around 5 Ohms.) . Therefore, in my opinions touch screens with fairly low resistance are not good choices

Andy

0 Patrick Chen over 11 years ago in reply to Andy Liu (BMS)

Mastermind 8875 points

Dear Andy,

Got it. Thank you.

Patrick

0 Patrick Chen over 11 years ago in reply to Patrick Chen

Mastermind 8875 points

Dear Andy,

Just one question. If we simply add a resistor (200ohm) over Y+ or Y- to compensate the impedance of Y plate. Has any problem for it? Thanks.

Patrick

0 Andy Liu (BMS) over 11 years ago in reply to Patrick Chen

TI__Guru 52115 points

Hi Patrick,

Sorry for the late response. I am just came back from a short vacation.

If you do that, the output (coordinates) range of TSC2046E will be quite limited if the resistance of y layer is as small as 30 Ohms.

Andy

Data converters

Data converters forum

Support Panel resistance spec. of TSC2046E