Atmel调试工具爱特梅尔触摸屏方案ATMXT336UDMAU002触屏芯片7寸触摸屏方案Microchip微芯

Description The mXT336UD-MAU002 2.0 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. The mXT336UD-MAU002 2.0 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.

maXTouch® Adaptive Sensing Technology Keys Touch Sensor Technology • Discrete/out-cell support including glass and PET filmbased sensors • On-cell/touch-on display support including TFT, LCD (I, IPS) and OLED • Synchronization with display refresh timing capability • Support for standard (for example, Diamond) and proprietary sensor patterns (review of designs by Microchip or a Microchip-qualified touch sensor module partner is recommended) Front Panel Material Touch Performance • Moisture/Water Compensation - No false touch with condensation or water drop up to 22 mm diameter - One-finger tracking with condensation or water drop up to 22 mm diameter • Mutual capacitance and self capacitance measurements supported for robust touch detection • P2P mutual capacitance measurements supported for extra sensitive multi-touch sensing • Noise suppression technology to combat ambient and power-line noise • Scan Speed - Typical report rate for 10 touches 90 Hz (subject to configuration) - Initial touch latency <18 ms for first touch from idle (subject to configuration) - Configurable to allow for power and speed optimization • Up to 14 X (transmit) lines and 24 Y (receive) lines for use by a touchscreen and/or key array • A maximum of 336 nodes can be allocated to the touch sensor • Touchscreen size of 7.11 inches (16:9 aspect ratio), assuming a sensor electrode pitch of 6.5 mm. Other sizes are possible with different electrode pitches and appropriate sensor material • Multiple touch support with up to 10 concurrent touches tracked in real time • Up to 16 nodes can be allocated as mutual capacitance sensor keys in addition to the touchscreen, defined as 1 key array (subject to availability of X and Y lines and other configurations) • Adjacent Key Suppression (AKS) technology is supported for false key touch prevention • Works with PET or glass, including curved profiles (configuration and stack-up to be approved by Microchip or a Microchip-qualified touch sensor module partner)

The ATMXT336UD touchscreen controller includes two families aimed at display sizes up to 7-inch:

General industrial applications (with device encryption): mXT336UD 2.0 and mXT228UD

Home Appliances (with IEC/UL 60730 Class B functional safety certification): mXT336UD-HA, mXT228UD-HA, and mXT112UD-HA

Proprietary differential touch sensing delivers unparalleled noise immunity ensuring superior touch performance even in harsh environments. It enables detection and tracking of multi-finger thick gloved touch through a wide variety of overlay materials and thicknesses, even in the presence of moisture, water and even salt water. This SNR combined with a high acquisition speed provides a fast, accurate and reliable a touch position. The controller also incorporates a new self and sensor diagnostic function, which constantly monitors the integrity of the touch system.

The general industrial mXT336UD family includes device encryption. This feature set supports encrypted messaging of the touch coordinates to the host CPU over I2C to help protect confidential credit card payment pin code, alarm/door entry codes, or medical/gaming device admin codes. Encrypted configuration locks the touch controller tuning parameters enabling OEMs to protect device certifications with a unique project-based customer password. Finally, the encrypted configuration feature also allows maXTouch touch sensor module partners to protect their proprietary tuning methods and prevent touch setting cloning.

The mXT336UD HA family is aimed at the home appliance market where Functional Safety is required. This device is IEC/UL 60730 Class B certified and offers unique safety-related features that enable system shut off through an intuitive soft button on a touchscreen, removing the requirement for an external safety certified stop or cancel button and associated microcontroller (MCU). They also allow an appliance to detect a touchscreen or appliance failure and shut down automatically through a variety of self-test capabilities.

Support: off the shelf maXTouch standard modules are available to help shorten development time and reduce risk. Microchip also has a strong selection of factory trained global touch sensor module partners to help support custom touch sensor and/or touchscreen display designs.