مدار مجتمع (آی سی) آی‌سی جمع‌آوری داده کنترلر صفحهٔ لمسی

Product Attributes

Introduction

The mXT640U 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 mXT640U 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.

Features

• Up to 32X (transmit) lines and 20 Y (receive) lines
• A maximum of 640 nodes can be allocated to the touchscreen
• Touchscreen size 8.17 inches (16:10 aspect ratio), assuming a sensor electrode pitch of 5.5 mm. Other sizes may be possible with different electrode pitches and appropriate sensor material
• Multiple touch support with up to 16 concurrent touches tracked in real time
• Dual-boot OS support for Microsoft Windows and Android
• Discrete/out-cell support including glass and PET film based sensors
• On-cell/touch-on display support including TFT, IPS and OLED
• Synchronization with display refresh timing capability
• Support for standard (for example, Diamond) and proprietary sensor patterns (review of designs by Microchip recommended)
• Works with PET or glass, including curved profiles (configuration and stack-up to be approved by Microchip)
• Glass 0.4 mm to 4.5 mm, dependent on screen size, touch size and stack-up
• Plastic 0.2 mm to 2.2 mm, dependent on screen size, touch size and stack-up
• 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
• Glove Support - Multiple-finger glove touches up to 1.5 mm thickness (subject to stack-up design) Single-finger glove touch up to 5 mm thickness (subject to stack-up design)
• Mutual capacitance and self capacitance measurements supported for robust touch detection
• Noise suppression technology to combat ambient, charger noise, and power-line noise - Up to 240 Vpp between 1 Hz and 1 kHz sinusoidal waveform - Up to 20 Vpr between 1 kHz and 1 MHz sinusoidal waveform
• Stylus Support - Supports passive stylus with 1 mm contact diameter, subject to configuration, stack up, and sensor design
• Scan Speed - Up to 250 Hz one finger reporting rate, subject to configuration Typical report rate for 10 touches ≥100 Hz (subject to configuration) - Initial touch latency < 20 ms for first touch from idle, subject to configuration Configurable to allow for power and speed optimization
• Supports wake up/unlock gestures, including symbol recognition
• Up to 32 nodes can be allocated as mutual capacitance sensor keys (subject to other configurations)
• Support for 3 Generic Keys in addition to the touchscreen array (subject to other configurations)
• Adjacent Key Suppression (AKS) technology is supported for false key touch prevention
• 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
• Up to 32 bytes of user-defined data can be stored during production
• Programmable timeout for automatic transition from active to idle states
• Pipelined analog sensing detection and digital processing to optimize system power efficiency
• I²C-compatible slave mode: Standard/Fast mode 400 kHz, Fast-mode Plus 1 MHz, High-speed mode up to 3.4 MHz
• HID-I²C interface for Microsoft Windows 8.x and later versions
• Interrupt to indicate when a message is available
• SPI Debug Interface to read the real-time raw data for tuning and debugging purposes
• Digital (Vdd) 3.3 V nominal
• Digital I/O (VddIO) 3.3 V nominal
• Analog (AVdd) 3.3 V nominal
• High voltage internal X line drive (XVdd) 6.6 V with internal voltage pump
• High voltage internal X line drive (XVdd) 9.9 V with internal voltage pump
• Operating Temperature -40°C to +85°C