mXT224 maXTouch™224-channel Touchscreen Sensor IC Data sheet
The mXT224 uses a unique charge-transfer acquisition engine to implement the QMatrix®capacitive sensing method patented by Atmel®. This allows the measurement of up to 224mutual capacitance channels. Coupled with a state-of-the-art CPU, the entire touch screen sensing solution can measure, classify and track a single finger touch every 4 ms if required.
The acquisition engine uses an optimal measurement approach to ensure almost complete immunity from parasitic capacitance on the receiver inputs (Y lines). The engine includes sufficient dynamic range to cope with touchscreen mutual capacitances spanning 0.5 pF to 5 pF.This allows great flexibility for use with Atmel’s proprietary ITO pattern designs. One and two layer ITO sensors are possible using glass or PET substrates.
The main CPU has two powerful, yet low power, microsequencer coprocessors under its control.These combine to allow the signal acquisition, preprocessing, post processing and housekeeping to be partitioned in an efficient and flexible way. This gives ample scope for sensing algorithms, touch tracking or advanced shape-based filtering. An in-circuit reflash can be performed over the chip’s hardware-driven two-wire interface (I2C-compatible).
The mXT224 represents a step improvement over competing technologies. It provides a near optimal mix of low power, small size and low part count with unrivalled true multitouch performance.
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Datasheet |
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Please see the document for details |
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UFBGA;VFBGA;QFN |
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English Chinese Chinese and English Japanese |
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June 2010 |
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Revision IX |
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9530IX–AT42 |
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1.5 MB |
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