ATMXT1664S1-CUR - maXTouch 1664-Channel Touch Controller | Microchip
MPN: ATMXT1664S1-CUR β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ATMXT1664S1-CUR Overview
A capacitive touch screen controller is an interface IC that measures capacitance changes across a grid of sensor electrodes to detect finger and stylus positions. Within the system hierarchy, it sits between the raw touch sensor (ITO pattern on glass or film) and the host application processor, converting analog charge-transfer measurements into touch coordinates over a digital interface. The maXTouch family from Microchip (originally Atmel) is a widely adopted line of such controllers used from wearables to large interactive displays.
The ATMXT1664S1 belongs to the S Series, which brings the maXTouch architecture to large touchscreen devices. Its 1664 sensing channels support high electrode counts typical of large-format panels, while the integrated 32-bit AVR core performs on-chip acquisition, filtering, and gesture processing, offloading the host processor. Multiple S Series devices can operate simultaneously to drive very large screens, a scalability feature documented by Microchip for this family.
The suffix structure of the part number encodes ordering options such as temperature grade and packaging (-CUR indicates a reflow-eligible, RoHS-grade ordering variant per Microchip nomenclature). As with all maXTouch parts, configuration of sensitivity, report rate, and multi-touch behavior is performed via firmware objects downloaded to the controller, allowing one PCB design to be tuned for different sensor stacks.
Typical applications include large interactive displays, industrial HMI panels, point-of-information kiosks, and premium consumer touch devices where high channel count and robust noise immunity near displays or chargers are required.
A key design consideration is that maXTouch controllers require a configuration file matched to the specific sensor pattern and stack-up; mismatched configurations degrade linearity and report rate. Verify communication with the host over the I2C-compatible interface during bring-up.
This page synthesizes distributor availability, Microchip product data, and the manufacturer-recommended replacement ATMXT1664T3 into one reference, adding drop-in alternative guidance and design notes not found in the datasheet alone.
Drop-in alternatives for ATMXT1664S1-CUR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMXT1664T3
β Drop-Inπ Reference alternative (not in catalog)
ATMXT1664S1-CUR Specifications
| Function | Capacitive touch screen controller |
| Family | maXTouch S Series (mXT1664S) |
| Touch Channels | 1664 |
| Core | 32-bit AVR |
| Sensing Type | Mutual capacitive |
| Multi-touch Support | Yes |
| Mounting Type | Surface Mount |
ATMXT1664S1-CUR standard Pin Configuration Guide
Pin configuration for ATMXT1664S1-CUR (standard package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ATMXT1664S1-CUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMXT1664S1-CUR is suitable for 6 applications: Large Interactive Displays, Industrial HMI Panels, Point-of-Information Kiosks, Premium Consumer Touch Devices, Medical Device Interfaces, Automotive-Style Touch Consoles (Non-AEC).
Large Interactive Displays
The ATMXT1664S1 fits large interactive displays because its 1664 mutual-sense channels address the high electrode counts of big-format ITO sensor patterns, while the on-chip 32-bit AVR core performs acquisition, filtering, and gesture detection locally, offloading the host SoC. Microchip documents that multiple mXT1664S controllers can operate simultaneously on one very large screen, scaling the total channel budget without redesigning the host interface. In use, the controller sits between the sensor and the host over the digital touch interface, reporting final coordinates at a configurable rate. The performance consideration is report-rate versus electrode count: larger sensor grids lower per-frame rates, so the touch configuration must balance resolution and responsiveness for the panel size.
Recommended
Industrial HMI Panels
Industrial human-machine interface panels benefit from the maXTouch S Series noise immunity, which suppresses interference from inverters, switched-mode supplies, and nearby displays - a documented strength of the maXTouch architecture in electrically harsh cabinets. The 1664-channel count of the ATMXT1664S1 supports large glass-on-glass HMI screens with dense electrode patterns, and the AVR-based on-chip processing keeps the main industrial controller free for control loops. Designers should tune the touch configuration for gloved-hand sensitivity thresholds and shielded sensor stacks. The trade-off is that configuration files are panel-specific; any change to the sensor stack-up requires re-tuning and requalification of the touch object table.
Recommended
Point-of-Information Kiosks
Kiosks and self-service terminals combine large touch surfaces with high public usage hours, so controller reliability and consistent report rates matter. The ATMXT1664S1's high channel count supports wide-format kiosk screens, while its multi-device capability (multiple maXTouch S Series parts per screen) enables very large ticketing or wayfinding displays. Its autonomous touch processing - reporting completed touch events rather than raw capacitance - simplifies kiosk host software. For deployment, designers should verify palm-rejection and water-rejection behavior via the maXTouch configuration objects, and consider the actively produced ATMXT1664T3 for new kiosk platforms to secure long-term supply.
Recommended
Premium Consumer Touch Devices
Premium consumer touch products demand multi-touch accuracy, fast response, and immunity to charger noise - areas where the maXTouch S Series architecture was positioned by Microchip. The ATMXT1664S1 provides high mutual-capacitance channel density for large tablets and touch-enabled appliances, and its integrated 32-bit AVR handles filtering and gesture pipelines on-chip, reducing host firmware complexity. Performance tuning focuses on report rate versus power: lower active report rates reduce average current in battery products, and deep-sleep object settings cut quiescent draw between touches. Because the S1 is EOL-adjacent, new consumer platforms should target the T Series successor for supply assurance.
Recommended
Medical Device Interfaces
Medical equipment touch panels - patient monitors, infusion consoles, diagnostic terminals - require dependable multi-touch detection near RF emitters and switching supplies. The maXTouch S Series acquisition and filtering engine of the ATMXT1664S1 supports operation in such noisy environments, and its deterministic host interface delivers touch events that medical UI software can map to safety-critical controls. Glove operation and wiped-clean sensor stacks are configurable via sensitivity objects. Designers must qualify the touch response time in the final assembly because shielding materials mandated by medical EMC requirements affect sensor sensitivity and report rate, and should confirm the -CUR variant's temperature rating against sterilization-adjacent thermal environments.
Recommended
Automotive-Style Touch Consoles (Non-AEC)
Large center-console-style touch screens in industrial vehicles, marine dashboards, and simulators mirror the automotive HMI use case; the maXTouch S Series was designed for such large-format panels. The ATMXT1664S1's 1664 channels and on-chip noise filtering address dense electrode layouts and interference from backlight inverters and wireless modules. Configuration objects enable water rejection and thin-glove operation common in these environments. Note that this part is not verified as AEC-Q100 qualified in the available data, so true automotive deployments require a qualified maXTouch variant. Verify the -CUR temperature grade against the cabin thermal profile before committing.
Recommended
Recommended Products Summary
Engineering reference data for ATMXT1664S1-CUR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMXT1664T3 |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Touch Channels | 1664 | 1664 |
| Series | maXTouch S Series | maXTouch T Series |
| Core | 32-bit AVR | 32-bit AVR |
| Lifecycle Status | EOL-adjacent (superseded) | Active (recommended replacement) |
Key Differentiators
- 1664 mutual-sense channels for large-format panels (vs Lower-channel maXTouch parts (e.g., smaller S/T family members))
- Multi-controller scalability on one screen (vs Single-controller touch ICs)
- Lifecycle trade-off vs ATMXT1664T3 (vs ATMXT1664T3)
Design Notes
The mXT1664S is EOL-adjacent: Microchip's official product page names the ATMXT1664T3 as the recommended alternative touch controller. Do not start new designs on the ATMXT1664S1-CUR; if you are locked into existing silicon, obtain Microchip's last-time-buy schedule immediately and qualify the T3 on a second-source footprint before stock dries up. Distributor coverage is thin (Octopart lists 4 distributors, several with stock "to be confirmed"), which increases counterfeit exposure when buying from brokers.
maXTouch controllers are highly sensitive to sensor-stack parasitics, so keep the sensor-to-controller flex or PCB traces short, shielded, and away from switching regulators and display driver rails. The touch configuration object table must match the electrode pattern and stack-up; a mismatched configuration causes linearity errors, ghost points, and reduced report rate. Budget bring-up time for iterative configuration tuning with Microchip's maXTouch debug tools on the real panel, not just reference hardware.
Drive the host touch interface per the datasheet timing table and add series termination on long flex runs to control reflections; maXTouch acquisition is charge-transfer based and jitter on the acquisition clock degrades touch resolution. Keep display VCOM and backlight inverter loops physically separated from sense lines. When multiple mXT1664S controllers share one very large screen, synchronize their acquisition timing per Microchip's multi-device guidance to prevent mutual interference between adjacent electrode regions.
Compliance Information
Compliance data was not present in the verified web data retrieved for this part; confirm RoHS/REACH status on the Microchip product page or the official datasheet for the -CUR ordering variant.
