ATMXT112S-MA5U
ATMXT112S-MA5U - 112-Ch maXTouch Touchscreen IC | Microchip
The Microchip Technology ATMXT112S-MA5U is a maXTouch S Series capacitive touchscreen controller IC optimized for screens up to 3.5 inches, featuring 112 mutual-capacitance sensing nodes, the industry's most advanced on-chip noise mitigation system, and a surface-mount QFN package suffix MA5U.
A capacitive touchscreen controller is a specialized interface-sensor IC that measures tiny capacitance changes on a projected-capacitive (PCAP) sensor panel and converts finger and stylus positions into digital coordinates for a host processor. Within the system hierarchy, it sits between the physical touch sensor (ITO patterned glass or film) and the host MCU or application processor, making it a key element of human-machine interface (HMI) and interface IC subsystems in embedded products.
Key features of the ATMXT112S-MA5U include the maXTouch S Series architecture delivering smartphone-like touch performance, 112 nodes supporting sensor panels up to 3.5 inches, and an on-chip noise mitigation engine that rejects charger and display noise without external filtering components. It communicates with the host over a standard I2C-style serial interface and supports self- and mutual-capacitance scanning for gloved-hand and proximity detection behavior typical of the maXTouch family.
Technically, the S Series generation integrates the acquisition engine, touch-processing firmware, and noise rejection in a single chip, offloading touch decoding entirely from the host CPU. This allows designers to add a responsive multi-touch interface to cost-sensitive devices while retaining a minimal bill of materials - typically the controller, the sensor panel, and a small number of passive support components.
Typical applications include smart watches and small wearables, portable medical and industrial handheld instruments, IoT device control panels, and compact appliance or automotive-adjacent HMI panels where screen sizes of 3.5 inches or below are used.
A key design consideration is matching the controller's 112-node budget to the sensor electrode count; over-counting nodes forces reduced scan rates, while under-utilization wastes cost. Firmware configuration files supplied by Microchip tuning tools should be validated on the actual sensor stack.
This page synthesizes verified distributor stock data, manufacturer cross-references, drop-in alternative analysis, and practical design guidance not found together in the standard datasheet.
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