MXT1664T3-ABESQTP datasheet(16/98 Pages) MICROCHIP

16 / 98 page

MXT1664T3 2.0

DS40002054A-page 16

 2018 Microchip Technology Inc.

1.0

OVERVIEW OF MXT1664T3

The Microchip maXTouch family of touch controllers brings industry-leading capacitive touch performance to customer

applications. The mXT1664T3 features the latest generation of Microchip adaptive sensing technology that utilizes a

hybrid mutual and self capacitive sensing system in order to deliver unparalleled touch features and a robust user

experience.

• Patented capacitive sensing method – The mXT1664T3 uses a unique charge-transfer acquisition engine to

implement Microchip’s patented capacitive sensing method. Coupled with a state-of-the-art CPU, the entire

touchscreen sensing solution can measure, classify and track a number of individual finger touches with a high

degree of accuracy in the shortest response time.

• Capacitive Touch Engine (CTE) – The mXT1664T3 features an acquisition engine, which uses an optimal

measurement approach to ensure almost complete immunity from parasitic capacitance on the receiver input

lines. The engine includes sufficient dynamic range to cope with anticipated touchscreen self and mutual

capacitances, which allows great flexibility for use with the Microchip proprietary sensor pattern designs. One- and

two-layer ITO sensors are possible using glass or PET substrates.

• Touch detection – The mXT1664T3 allows for both mutual and self capacitance measurements, with the self

capacitance measurements being used to augment the mutual capacitance measurements to produce reliable

touch information.

When self capacitance measurements are enabled, touch classification is achieved using both mutual and self

capacitance touch data. This has the advantage that both types of measurement systems can work together to

detect touches under a wide variety of circumstances.

The system may be configured for different types of default measurements in both idle and active modes. For

example, the device may be configured for Mutual Capacitance Touch as the default in idle mode and Self

Capacitance Touch as the default in active mode. Note that other types of scans (such as other types of self

capacitance scans) may also be made depending on configuration.

Mutual capacitance touch data is used wherever possible to classify touches as this has greater granularity than self

capacitance measurements and provides positional information on touches. For this reason, multiple touches can

only be determined by mutual capacitance touch data. In Self Capacitance Touch Default mode, if the self

capacitance touch processing detects multiple touches, touchscreen processing is skipped until mutual capacitance

touch data is available.

Self capacitance measurements allow for the detection of touches in extreme cases, such as thick glove touches,

when mutual capacitance touch detection alone may miss touches.

• Display Noise Cancellation – A combination of analog circuitry, hardware noise processing, and firmware that

combats display noise without requiring additional listening channels or synchronization to display timing. This

enables the use of shieldless touch sensor stacks, including touch-on-lens.

• Noise filtering – Hardware noise processing in the capacitive touch engine provides enhanced autonomous

filtering and allows a broad range of noise profiles to be handled. The result is good performance in the presence

of charger and LCD noise.

• Processing power – The main CPU has two powerful microsequencer coprocessors under its control consuming

low power. This system allows the signal acquisition, preprocessing, postprocessing and housekeeping to be

partitioned in an efficient and flexible way.

• Interpreting user intention – The Microchip hybrid mutual and self capacitance method provides unambiguous

multitouch performance. Algorithms in the mXT1664T3 provide optimized touchscreen position filtering for the

smooth tracking of touches, responding to a user's intended touches while preventing false touches triggered by

ambient noise, conductive material on the sensor surface, such as moisture, or unintentional touches from the

user’s resting palm or fingers.

MXT1664T3-ABESQTP Datasheet(PDF) 16 Page - Microchip Technology

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