MAX11810, MAX11811,pdf datashe

The MAX11810/MAX11811 low-power touch interface solutions operate from a single 1.7V to 3.6V supply, and target power-sensitive applications such as handheld equipment. The ICs include a 4-wire resistive touch-screen controller, a haptic motor controller plus driver, and an IR proximity-sensing system. The MAX11810/MAX11811 contain a 12-bit SAR ADC and a multiplexer to interface with a 4-wire resistive touch-screen panel. A digital serial interface provides communications.

The MAX11810/MAX11811 include an advanced state machine, which performs digital preprocessing of the touch-screen measurements, reducing bus loading and application-processor resource requirements. The devices enter low-power modes automatically between conversions to save power, making them ideal for portable applications. Also included is a smart interrupt-generation engine, which enables servicing the parts only when needed. The register map is compatible with that of the MAX11800/MAX11801.

In addition, the MAX11810/MAX11811 have a built-in haptic controller plus driver to either drive a vibration motor directly, or to interface with an external piezo driver. The built-in haptic waveform generator generates > 50,000 haptic patterns, which are configured through the serial interface. This eliminates the need for a dedicated interface on the applications processor/microcontroller end.

They also contain a general-purpose current DAC output and voltage input. The DAC output can drive IR and visible LEDs; the input can connect to either a photo-detector for proximity sensing, or an ambient light sensor.