ATMXT1664S1-CU - maXTouch Touchscreen Controller IC | Microchip Technology
MPN: ATMXT1664S1-CU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.9 | $8.90 |
| 10 | $8.12 | $81.20 |
| 100 | $7.35 | $735.00 |
| 500 | $6.62 | $3,310.00 |
| 1,000 | $5.95 | $5,950.00 |
ATMXT1664S1-CU Overview
A capacitive touchscreen controller measures mutual capacitance across a matrix of transmit and receive electrodes on the touch sensor. When a finger or passive stylus approaches the intersection of electrodes, local capacitance changes; the controller scans the matrix, converts the capacitance deltas to touch coordinates, applies gesture and noise filtering, and reports touch data to a host processor over an interface such as I2C or SPI. Touchscreen controllers sit within the broader hierarchy of sensor interface ICs and human-machine interface (HMI) semiconductors.
The maXTouch S-series architecture integrates a high-performance acquisition engine with differential charge amplifiers, a configurable scan sequencer, and an embedded MCU core executing Microchip-supplied object-based firmware. Self- and mutual-capacitance fusion enables gloved-hand operation and water rejection, while frequency-hopping acquisition combats charger and display noise - a critical requirement for thin bezel tablets, POS terminals, and automotive HMI panels.
Technical strengths of the family include high node counts supporting large-format touch panels, the maXTouch object model allowing configuration of key timings and thresholds via I2C registers, and mature firmware tooling through Microchip's maXTouch studio ecosystem. The S1 model designation reflects the firmware/feature configuration of the 1664-node silicon.
Typical applications include 7-inch to 13-inch capacitive touchscreens in tablets, human-machine interfaces for white goods and appliances, point-of-sale and ticketing terminals, smart-home wall panels, and industrial operator panels where multi-touch and robust noise immunity are required.
When designing with this controller, allocate a clean low-noise analog supply for the sensing core and route the sensor flex connector away from switching regulators; charger-mode noise often dominates real-world touch performance and must be verified with the intended display and charger pair.
This page synthesizes distributor sourcing data, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet, with pricing as of 2026-09-19.
Drop-in alternatives for ATMXT1664S1-CU 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:
ATMXT1664SC11-CUR
β Drop-Inπ Reference alternative (not in catalog)
ATMXT1664SC06-CUR
β Drop-Inπ Reference alternative (not in catalog)
ATMXT1664S1-CU Specifications
| Product Type | Capacitive Touchscreen Controller |
| Product Family | maXTouch S-series |
| Sensing Technology | Projected Capacitive (Mutual/Self Capacitance) |
| Touch Channels | 1664 nodes (MAXTOUCH 1664 CHAN) |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS3 Compliant |
| Lead Free Status | Lead Free |
| Firmware Model | S1 configuration |
| Manufacturer Status | Samples Available (per Microchip product page) |
ATMXT1664S1-CU standard Pin Configuration Guide
Pin configuration for ATMXT1664S1-CU (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-CU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMXT1664S1-CU is suitable for 6 applications: Tablet and Large-Format Touch Panels, Appliance and White-Goods HMI, Point-of-Sale and Ticketing Terminals, Industrial Operator Panels, Smart Home Wall Panels, Automotive Center-Stack and Cluster HMIs.
Tablet and Large-Format Touch Panels
The ATMXT1664S1-CU's 1664 mutual-capacitance node capacity is sized for 7- to 13-inch projected-capacitive touchscreens where a dense TX/RX electrode matrix is required. Its maXTouch S-series acquisition engine scans the full matrix with frequency hopping, suppressing charger-mode and display noise that would otherwise corrupt finger tracking on thin, bright tablets. In a typical design, the controller sits on the sensor flex tail, communicates coordinates to the application processor over I2C, and executes water rejection and gloved-hand handling in firmware. The self-plus-mutual capacitance fusion delivers both fast single-finger response and reliable multi-touch palm rejection, a key trade point for consumer tablets where touch latency directly affects perceived quality.
Recommended
Appliance and White-Goods HMI
Kitchen and laundry appliances use glass-over-lens capacitive panels exposed to wet fingers, gloves, and electrically noisy compressor/inverter environments. The ATMXT1664S1-CU addresses this with S-series water rejection firmware and differential charge amplifiers that maintain SNR despite switching noise coupling into the sensor. Its 1664-node budget covers large front panels with slider controls and icon arrays while leaving self-capacitance guard nodes for proximity wake. Integration is firmware-centric: touch thresholds and key timings are configured through the maXTouch object model over I2C, letting appliance makers tune sensitivity per product without hardware changes. Compliance support is simplified by RoHS3-compliant, lead-free construction suitable for EU-market appliances.
Recommended
Point-of-Sale and Ticketing Terminals
POS terminals and ticketing machines demand touchscreens that stay responsive while powered from switched-mode chargers and mounted near receipt printers and payment electronics. The ATMXT1664S1-CU's frequency-hopping acquisition automatically avoids charger noise harmonics, and its noise-immunity object configuration allows OEMs to blacklist problem frequency bands discovered during field testing. The high node count supports both customer-facing touch displays and signature-capture panels with pen-level resolution. Long-term availability matters in this sector: the part is an active Microchip product with samples available, and Microchip's HMI lifecycle policy supports multi-year production schedules typical of payment hardware certifications.
Recommended
Industrial Operator Panels
Factory HMI panels must accept gloved touches, survive EMI from variable-frequency drives, and run for a decade in continuous service. The ATMXT1664S1-CU's self-capacitance fusion detects touches through work gloves by amplifying the self-cap signal, while differential mutual-capacitance scanning rejects common-mode noise injected by adjacent drive cabling. The 1664-node matrix suits 7- to 12-inch operator terminals with function keys and sliders. Because the controller is configured entirely in firmware via the maXTouch object model, one PCB can serve multiple panel sizes by changing configuration only - a significant cost saving for industrial OEMs with variant-rich product lines and long qualification cycles.
Recommended
Smart Home Wall Panels
Smart-home wall controllers combine a touch display with always-on proximity wake and must operate flawlessly next to Wi-Fi radios and dimmer-driven mains noise. The ATMXT1664S1-CU provides the node budget for a large touch glass plus a self-capacitance proximity region that wakes the panel as a user approaches, saving display power. Frequency-hopped acquisition steps around Wi-Fi and switch-mode harmonics in 1.6 V-class analog front-end scans, and water-rejection firmware prevents false taps from condensation in humid rooms. Firmware tuning over I2C lets installers adjust sensitivity remotely as part of whole-home commissioning, without touching the hardware stack.
Recommended
Automotive Center-Stack and Cluster HMIs
Automotive touch HMIs impose stringent electromagnetic compatibility, -40C to +85C ambient operation, and AEC-grade reliability expectations. Microchip's maXTouch line extends into automotive variants (such as the maXTouch 2912TG class) sharing the acquisition architecture used by the ATMXT1664S1-CU, so designs validated on the S1 controller port naturally to automotive-grade family members. The 1664-node capacity fits compact cluster touch overlays and secondary center-stack panels, while charger-noise rejection firmware maps directly onto the alternator and DC-DC noise environment in vehicles. Designers must confirm the specific automotive-qualified orderable variant and package for production; the S1-CU serves as the development and platform-validation device.
Recommended
Recommended Products Summary
Engineering reference data for ATMXT1664S1-CU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMXT1664SC11-CUR | ATMXT1664SC06-CUR |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Touch Sensing Nodes | 1664 | 1664 | 1664 |
| Firmware Configuration | S1 | SC11 | SC06 |
| RoHS Status | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant |
| Lifecycle Status | Active (samples available) | Active | Active |
Key Differentiators
- S1 firmware configuration of 1664-node silicon (vs ATMXT1664SC11-CUR)
- Same-footprint firmware-flexible alternative (vs ATMXT1664SC06-CUR)
- Active lifecycle with sampling channel (vs Legacy Atmel maXTouch T/U-series parts)
Design Notes
Estimated: route the sensor flex connector and analog sensing supply away from DC-DC converters and backlight LED drivers. maXTouch SNR is dominated by radiated and conducted noise coupling into the sensor matrix; keep the controller's analog ground plane continuous and place decoupling capacitors directly at the supply pins per the Microchip datasheet layout guidelines. Avoid crossing high-speed display LVDS lines under the touch sensor routing region.
Use the maXTouch noise-immunity object configuration to blacklist charger frequency bands discovered during system testing. Charger-mode interference is application-specific: test with the exact AC adapter and display backlight driver intended for production, then lock the frequency-hop table. Re-run this test whenever the power supply or display is changed, since the noise spectrum shifts with each new component.
Do not swap firmware builds (S1 vs SC11 vs SC06) without revalidating the full touch stack. Each maXTouch firmware configuration implements different filtering, water rejection, and object tables; a pin-identical part with different firmware can fail gloved-touch or water tests even though the hardware is unchanged. Verify the firmware variant printed on the orderable MPN before releasing the bill of materials.
Compliance Information
Distributor listing (iccomponents-distributor.com) states 'Lead Free Status / RoHS Status: ROHS3 Compliant'. REACH, halogen-free, and conflict-minerals status not stated in provided data.
