640-channel capacitive touch controller for large-format panels
The Microchip ATMXT640UD-CCUR001 is a 640-channel MaxTouch UD series touchscreen controller for 2-wire capacitive touch sensors — the channel count scales to cover displays up to about 15–17 inches depending on sensor pitch and routing, making it a fit for industrial HMIs, point-of-sale terminals, and medical touch interfaces that need multi-touch without a bezel overlay. It communicates over I²C or SPI, giving the host MCU a choice between a two-wire bus at lower data rates or a four-wire bus for faster report rates — SPI is the usual pick when the touch controller shares the bus with other peripherals and the host needs sub-10 ms latency on touch reports.
Supply rails and temperature range for embedded integration
The ATMXT640UD-CCUR001 runs from a dual-supply scheme: a 1.71 V to 3.47 V core rail and a separate 3.14 V to 3.47 V I/O rail — the core voltage lets it interface directly with 1.8 V logic MCUs, while the I/O rail matches 3.3 V peripheral buses without a level shifter. Supply current is 40 mA typical — modest for a 640-channel controller scanning a full panel at a 100–120 Hz report rate, and low enough that a standard 3.3 V LDO with 150 mA rating has headroom for the controller plus the sensor drive.
Active lifecycle and RoHS3 compliance
RoHS3 compliant (RoHS exemption 7c-I for lead in glass is not claimed here — the part meets the full RoHS3 substance limits per Microchip's compliance documentation).