Semtech SX8633带LED驱动和接近传感的容性触摸控制方案

Semtech 公司的SX8633是带有增强LED驱动器和接近传感的12路低功耗容性触摸控制器,具有专用的容性传感输入和8个通用I/O9端口(GPIO),没个GPIO可配置成带独立PWM源的LED驱动器,用来照明控制.此外还包括了电容10位ADC模拟接口,自动补偿达100pF,分辨率高,触摸厚度达5mm,主要用在笔记本/上网本/手持/手提电脑,手机和PDA,以及消费类产品,仪表,汽车电子和替代机械按钮.本文介绍了SX8633主要特性, 方框图, 模拟传感器接口框图, 典型应用电路以及触摸+接近模块电路图.

SX8633: Low Power, Capacitive Button Touch Controller (12 sensors) with Enhanced LED Drivers and Proximity Sensing

The SX8633 is an ultra low power, fully integrated 12-channel solution for capacitive touch-buttons and proximity detection applications. Unlike many capacitive touch solutions, the SX8633 features dedicated capacitive sense inputs (that requires no external components) in addition to 8 general purpose I/O ports (GPIO). Each GPIO is typically configured as LED driver with independent PWM source for enhanced lighting control such as intensity and fading.

The SX8633 includes a capacitive 10 bit ADC analog interface with automatic compensation up to 100pF. The high resolution capacitive sensing supports a wide variety of touch pad sizes and shapes and allows capacitive buttons to be created using thick overlay materials (up to 5mm) for an extremely robust and ESD immune system design.
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