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TSC2046: lose data when move pencil quickly

Part Number: TSC2046

Hi,

my customer is using TSC2046 for their system to interface with their touch panel.

When they move the pencil on the touch panel quicky(<1s) from left to right, the X position data will be lost for the left 1/3 and right 1/3, only the 1/3 in the middle will be recorded.

If we move the pencil on the touch panel slowly, the X position data will be recorded correctly.

The same applies to Y position.

Since MCU will record the X position and Y position and then draw line on the screen, if we move pencil too fast from left to right, only 1/3 in the middle will be displayed on the screen.

What may be the cause and how could we solve the problem?