mXT799T-AT/mXT799T-AB 1.0 maXTouch 798-node Touchscreen Controller Product Brief Description The mXT799T-AT/mXT799T-AB uses a unique charge-transfer acquisition engine to implement Microchips 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 mXT799T-AT/ mXT799T-AB 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 Touchscreen Touch Performance Technology Moisture/Water Compensation Up to 32 X (transmit) lines and 52 Y (receive) lines - No false touch with condensation or water drop up to 22 mm diameter A maximum of 798 nodes can be allocated to the touchscreen - One-finger tracking with condensation or water drop up to 22 mm diameter Touchscreen size 9.4 inches (16:9 aspect ratio), assuming a sensor electrode pitch of 5.5 mm. Other Glove Support sizes may be possible with different electrode pitches - Multiple-finger glove touches up to 1.5 mm and appropriate sensor material thickness (subject to stack-up design) Multiple touch support with up to 16 concurrent - Single-finger glove touch up to 5 mm thickness touches tracked in real time (subject to stack-up design) Mutual capacitance and self capacitance Automotive Applications measurements supported for robust touch detection AEC-Q100 Qualified Noise suppression technology to combat ambient and Developed following Automotive SPICE Level 3 power-line noise certified processes - Up to 240 Vpp between 1 Hz and 1 kHz CISPR-25 compliant (for both mutual and self sinusoidal waveform capacitance measurements) - Up to 20 Vpp between 1 kHz and 1 MHz sinusoidal waveform Touch Sensor Technology Burst Frequency Discrete/out-cell support including glass and PET film- - Controlled Tx burst frequency drift over process based sensors and temperature range On-cell/touch-on display support including TFT, IPS Scan Speed and OLED - Up to 110 Hz one finger reporting rate (subject to Synchronization with display refresh timing capability configuration) Support for standard (for example, Diamond) and - Typical report rate for 10 touches 100 Hz proprietary sensor patterns (review of designs by (subject to configuration) Microchip recommended) - Initial touch latency <25 ms for first touch from idle (subject to configuration) Front Panel Material - Configurable to allow for power and speed Works with PET or glass, including curved profiles optimization (configuration and stack-up to be approved by Microchip) On-chip Gestures Glass 0.4 mm to 4 mm with GFF stack, 0.55 mm to Reports one-touch and two-touch gestures 4 mm with OGS stack (dependent on screen size, touch size, configuration and stack-up) Plastic 0.2 mm to 3 mm (dependent on screen size, touch size, configuration and stack-up) 2017 Microchip Technology Inc. Product Brief DS40001960A-page 1 MXT799T-AT/MXT799T-AB 1.0 Keys Up to 32 nodes can be allocated as mutual capacitance sensor keys (subject to other configurations) Adjacent Key Suppression (AKS) technology is supported for false key touch prevention Enhanced Algorithms Lens bending algorithms to remove display noise Touch suppression algorithms to remove unintentional large touches, such as palm Palm Recovery Algorithm for quick restoration to normal state Power Saving Programmable timeout for automatic transition from active to idle states Pipelined analog sensing detection and digital processing to optimize system power efficiency Application Interfaces 2 I C-compatible slave with support for: - Standard mode (up to 100 kHz) - Fast mode (up to 400 kHz) - Fast-mode Plus (up to 1 MHz) - High-speed mode (up to 3.4 MHz) SPI slave interface (up to 8 MHz) Interrupt to indicate when a message is available SPI Debug Interface to read the real-time raw data for tuning and debugging purposes Power Supply Digital (Vdd) 3.3 V nominal Digital I/O (VddIO) 3.3 V nominal Analog (AVdd) 3.3 V nominal High voltage external X line drive (XVdd) up to 9.0 V Package 144-pin LQFP 20 20 1.4 mm, 0.5 mm pitch Operating Temperature mXT799T-AT: 40C to +85C (Grade 3) mXT799T-AB: 40C to +105C (Grade 2) Design Services Review of device configuration, stack-up and sensor patterns Custom firmware versions can be considered, such as for specific gestures or proprietary OEM host communication protocols Contact your Microchip representative for more information DS40001960A-page 2 Product Brief 2017 Microchip Technology Inc.