MICROCHIP ATMXT640UD-CCU002

The maXTouch 640-node touchscreen controller uses maXTouch adaptive sensing technology with the following features:

• Up to 32 X (transmit) lines and 20 Y (receive) lines for touchscreen and/or key arrays.
• Up to 640 nodes assignable to touch sensors.
• Assumes 6.5 mm sensor electrode pitch for a 9.7-inch touchscreen (16:10 aspect ratio); other sizes achievable with different electrode pitches and appropriate sensor materials.
• Multi-touch support with real-time tracking of up to 16 simultaneous touch points.
• Up to 32 nodes assignable as mutual capacitance sensor keys in addition to the touchscreen, defined as 1 key array.
• Up to 3 mutual capacitance general-purpose keys as an alternative to touchscreen key arrays.
• Adjacent Key Suppression (AKS) to prevent accidental key activation.
• On-cell/touch display technology support including OLED and LCD (ITPS, IPS).
• Discrete/out-cell technology support including glass- and PET film-based sensors.
• Synchronization capability with display refresh timing.
• Standard (e.g., diamond) and proprietary sensor pattern support.
• Compatible with PET or glass, including curved form factors.
• 10 mm glass (or 5 mm PMMA) operation with bare finger.
• 6 mm glass (or 3 mm PMMA) operation with 5 mm five-finger gloves.
• Non-rectangular sensor designs (e.g., circular, rounded corners, or with cutouts).
• Moisture/water compensation: condensation or water droplets up to 22 mm diameter without false touches, with single-finger tracking capability.
• Mutual and self-capacitance measurements for reliable touch detection.
• Point-to-point mutual capacitance measurements for ultra-sensitive multi-touch sensing.
• Noise suppression against environmental and power line noise.
• Passive stylus support with 1.5 mm tip diameter.
• Flexible dynamic Tx burst frequency selection for reduced EMI.
• Configurable Tx waveform shaping for reduced emissions.
• Typical report rate ≥100 Hz for 10 touches.
• Initial touch latency from idle <20 ms.
• Configurable for optimized power and speed.
• Touch panel fault detection with runtime automatic touch sensor diagnostics, supporting safety-critical functions; diagnostic information reported via dedicated output pin or standard object protocol messages, with configurable test limits.
• Single-touch and double-touch gesture reporting.
• PWM signal generation for display backlight control, audio speaker/buzzer output, or simple haptic feedback.
• Enhanced algorithms including lens-bending algorithm for display noise removal, touch suppression algorithm for accidental large-touch removal, and palm recovery algorithm for fast return to normal state.
• 32-byte data area with CRC checksum for runtime product data storage, plus 64-byte user-defined data area (no CRC checksum).
• Encryption of configuration parameters and touch coordinate reports (OBP messages) using customer's own security key.
• Programmable timeout for automatic transition from active to idle state, with pipelined analog sensing detection and digital processing for optimized system power efficiency.
• I²C client interface for primary device communication, supporting Standard Mode (up to 100 kHz), Fast Mode (up to 400 kHz), Fast Mode Plus (up to 1 MHz), and High-Speed Mode (up to 3.4 MHz).
• Interrupt function indicating message availability.
• Additional hardware debug interface for raw data readout for tuning and debugging.
• Digital supply (Vdd) nominal 3.3V, digital I/O (VddIO) nominal 3.3V, analog supply (AVdd) nominal 3.3V, internal X-line high-voltage drive (XVdd) providing 6.6V or 9.9V via internal charge pump.
• 88-ball UFBGA package, 6 × 6 × 0.6 mm, 0.5 mm pitch.
• Operating temperature range: -40°C to +85°C.

• Up to 32 X (transmit) lines and 20 Y (receive) lines for use by a touchscreen and/or key array
• A maximum of 640 nodes can be allocated to the touch sensor
• Touchscreen size of 9.7 inches (16:10 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 16 concurrent touches tracked in real time
• Up to 32 nodes can be allocated as mutual capacitance sensor keys in addition to the touchscreen, defined as 1 key array
• Support for up to 3 mutual capacitance Generic Keys as an alternative to the touchscreen key array
• Adjacent Key Suppression (AKS) technology is supported for false key touch prevention
• On-cell/touch-on display support including OLED and LCD (ITPS, IPS)
• Discrete/out-cell support including glass and PET film - based sensors
• Synchronization with display refresh timing capability
• Support for standard (for example, Diamond) and proprietary sensor patterns
• Works with PET or glass, including curved profiles
• 10 mm glass (or 5 mm PMMA) with bare finger
• 6 mm glass (or 3 mm PMMA) with multi - finger 5 mm glove (2.7 mm PMMA equivalent)
• Support for non - rectangular sensor designs (for example, circular, rounded or with cutouts)
• 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: Up to 240 VPP between 1 Hz and 1 kHz sinusoidal waveform (no touches); IEC 61000 - 4 - 6, 10 Vrms, Class A (normal touch operation) conducted noise immunity
• Stylus Support: Supports passive stylus with 1.5 mm contact diameter
• Burst Frequency: Flexible and dynamic Tx burst frequency selection to reduce EMC disturbance; Configurable Tx waveform shaping to reduce emissions
• Scan Speed: Typical report rate for 10 touches ≥100 Hz; Initial touch latency <20 ms for first touch from idle; Configurable for power and speed optimization
• Touch panel failure detection: Automatic touch sensor diagnostics during run time to support the implementation of safety critical features; Diagnostics reported using dedicated output pin or by standard Object Protocol messages; Configurable test limits
• Reports one - touch and two - touch gestures
• Output for display backlight control, audible speaker/buzzer output, or simple haptic feedback
• Lens bending algorithms to remove display noise
• Touch suppression algorithms to remove unintentional large touches
• Palm Recovery Algorithm for quick restoration to normal state
• 32 - byte CRC checksummed data area for use as a run - time Product Data Store Area
• 64 - byte data area for user’s custom data (not CRC checksummed)
• Encrypted configuration parameters and touch coordinate reports (OBP messages) using customer's own security key
• Programmable timeout for automatic transition from Active to Idle state
• Pipelined analog sensing detection and digital processing to optimize system power efficiency
• I2C client interface for main communication with the device: 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)
• Interrupt to indicate when a message is available
• Additional Hardware Debug Interface to read the raw data for tuning and debugging purposes
• Digital (Vdd) 3.3V nominal
• Digital I/O (VddIO) 3.3V nominal
• Analog (AVdd) 3.3V nominal
• High voltage internal X line drive (XVdd) 6.6V or 9.9V with internal voltage pump
• Operating Temperature: - 40°C to + 85°C