Microchip ATMXT144UD-SL Manual

Microchip Ikke kategoriseret ATMXT144UD-SL

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 2022 Microchip Technology Inc. and its subsidiaries Product Brief DS40002447A-page 1

mXT144UD-AMTSL/

mXT144UD-AMBSL 1.0

Description

The mXT144UD-AMxSL 1.0 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 sensor 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 mXT144UD-AMxSL 1.0

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.

Automotive Applications

maXTouch® Adaptive Sensing Technology

Keys

Touch Sensor Technology

• On-cell/touch-on display support including OLED, TFT

and LCD (ITPS, IPS)

• Discrete/out-cell support including glass and PET film-

based sensors

• Synchronization with display refresh timing capability

• Support for slider touch sensor patterns designed

following Microchip guidelines (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

• 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 5 touches 120 Hz (subject

to configuration)

- Initial touch latency <6 ms for first touch from idle

(subject to configuration)

• AEC-Q100 Qualified

• CISPR 25 compliant (for both mutual and self

capacitance measurements)

• Up to 12 X (transmit) lines and 12 Y (receive) lines for

use by a slider and/or key array

• A maximum of 144 nodes can be allocated to the

touch sensor

• Slider length 936 mm, assuming a sensor electrode

pitch of 6.5 mm. Other lengths 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 slider,

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)

• 10 mm glass (or 5 mm PMMA) with bare finger

(dependent on sensor size, touch size, configuration

and stack-up)

• 6 mm glass (or 3 mm PMMA) with multi-nger 5 mm

glove (2.7 mm PMMA equivalent) (dependent on

sensor size, touch size, configuration and stack-up)

- Up to 240 VPP between 1 Hz and 1 kHz sinusoidal

waveform (no touches)

- Up to 20 VPP between 1 kHz and 1 MHz

sinusoidal waveform

maXTouch 144-node Touch Slider Controller

Product Brief

mXT144UD-AMxSL 1.0

DS40002447A-page 2 Product Brief  2022 Microchip Technology Inc. and its subsidiaries

- 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

Enhanced Algorithms

• Lens bending algorithms to remove display noise

• Touch suppression algorithms to remove unintentional large touches

• Palm Recovery Algorithm for quick restoration to normal state

Data Store

• 64-byte data area for user’s custom data (not CRC checksummed)

Power Saving

• Programmable timeout for automatic transition from Active to Idle state

• Pipelined analog sensing detection and digital processing to optimize system power efficiency

• Low power idle mode reduces measurements to the minimum required to detect touches, at which point the

device enters active mode to perform full measurement and touch processing

Application Interfaces

Power Supply

Package

• 56-pin VQFN 7 × 7 × 0.9 mm, 0.4 mm pitch, with exposed pad and stepped wettable flanks

Operating Temperature

Design Services

• Review of device configuration, stack-up and sensor patterns

• I2C client interface for main communication with the device, with support for Standard mode (up to 100 kHz),

Fast mode (up to 400 kHz), Fast-mode Plus (up to 1 MHz)

• Interrupt to indicate when a message is available

• Additional SPI 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 with internal voltage pump

• mXT144UD-AMTSL: –40C to +85C (Grade 3)

• mXT144UD-AMBSL: –40 C to +105 C (Grade 2)

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	ATMXT144UD-SL

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