XPT2046 is a chip that can convert analog signals into digital signals for touch (pressure) sensing, heat sensing, light sensing, smoke sensing, etc.
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XPT2046 power consumption at 125KHz conversion rate and 2.7V voltage is only 750 μW, XPT2046 with its low power consumption and high speed characteristics, is widely used in the use of battery powered small handheld devices, such as PDA, mobile phone and so on.
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The XPT2046 has an internal 2.5V reference voltage source that can be used as an auxiliary input, reference voltage for battery voltage measurement and on-chip temperature measurement.
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The reference voltage source can be in power-saving mode when the XPT2046 is not in use.
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The XPT2046 internal reference voltage source can still work normally when the power supply is low to 2.7V, and monitors the power supply voltage in the range of 0V to 6V.
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XPT2046 Main features:
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The operating voltage ranges from 2.2V to 5.25V
Supports 1.5V to 5.25V digital I\/O ports
Built-in 2.5V reference voltage source
Power supply voltage measurement (0V~6V)
Built-in junction temperature measurement function
Touch pressure measurement
SPI3 line is used to control the communication interface
It has automatic power-down function
Package: QFN-16
The XPT2046 is the first line resistive touch screen, the key is composed of a double layer of ITO coated plastic film. In one layer, there is a vertical system bus on the upper and lower edges of the display, and the other layer has a level system bus on the bottom and top of the display. If the working voltage is released on the two system buses of a layer of plastic film, a symmetrical electrostatic field will be generated on the ITO coating.
When a person touches the display screen, the double-layer plastic film at the touch point will touch, and the working voltage value of the point contact can be accurately measured on another layer of plastic film.