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XPT7603 Datasheet(PDF) 23 Page - List of Unclassifed Manufacturers

Part No. XPT7603
Description  4-wire resistive touch screen controller
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Maker  ETC2 [List of Unclassifed Manufacturers]
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 23 page
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To enable the chip to optimum performance,do take extra care to deal with the physical connection of XPT
2047 circuit. SAR basic structure is very sensitive to the pulse interference, and the mutation of power supply
voltage, reference voltage, ground connection, and the digital input which only occurred before the analog
comparator output latch. Thus, in n-bit SAR converter conversion in any one will have n external transient
voltage by changing the formation of a "window" to affect the outcome of the conversion. Similar pulse
interference may come from switching power supplies, nearby digital logic circuits, and high-power devices.
These disturbances caused by digital logic output error depends on the reference voltage, layout wiring and
external timing. Clock input timing of the changes in the same digital logic of the existence of the impact of the
error output.
For the interference effects of the above considerations, XPT7603 power supply must be clean, and there is a
good bypass. As far as possible close to the chip in the next, plus a 0.1
μF ceramic capacitor referral. If the
power supply VDD and a high impedance between the positive, it should also add a 1
μF ~ 10μF capacitance.
Leakage current for all capacitors must be small enough to avoid XPT7603 down to the system when the
additional power consumption. In general, VREF pin does not require additional bypass capacitor, because
the internal reference voltage has been through internal operational amplifier output buffer. However, if you
use an external reference voltage source, need to add bypass capacitor, and to ensure that does not cause
oscillation.
XPT7603 source for external reference voltage input without noise suppression, if the input reference voltage
source directly connected with the power supply, power supply noise and ripple on will directly affect the
numerical accuracy of the conversion. Despite the high-frequency noise can be filtered, but the signal
frequency is very difficult to filter out interference, which is in the design requires a high degree of attention.
GND for the simulation of XPT7603, the pin must be received from a very clean place up, to avoid micro-
controller or digital signal processor then near. If it is possible, it would be preferable to a separate converter
to connect to the internal power supply (or batteries) take place. The layout will be the best converter and
other analog circuits placed in the same plane in a simulated manner.




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