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STMPE821 Datasheet 8-bit Xpander Logic

Manufacturer: STMicroelectronics

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General Description

The STMPE821 is a GPIO (general purpose input/output) port expander able to interface a main digital ASIC via the two-line bidirectional bus (I2C).

A separate GPIO expander is often used in mobile multimedia platforms to solve the problems of the limited amount of GPIOs typically available on the digital engine.

The STMPE821 offers great flexibility, as each I/O can be configured as input, output or specific functions.

Overview

STMPE821 8-bit Xpander Logic™ with touchkey controller Preliminary.

Key Features

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  • to 8 GPIOs to 8 touchkey capacitive touch inputs Operating voltage 1.8 - 5.5 V Internal regulator Interrupt output pin I2C interface 8 kV HBM ESD protection 40 fF resolution, 128 steps capacitance measurement (5.0 pF dynamic range) Advanced data filtering (AFS) Environment tracking calibration (ETC) Individually adjustable touch variance (TVR) setting for all channels Adjustable environmental vari.

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