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Semtech 公司的SX8633是带有增强LED驱动器和靠近传感的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.别的还包罗了电容10位ADC模拟接口,自动赔偿达100pF,分辨率高,触摸厚度达5mm,主要用在条记本/上网本/手持/手提电脑,手机和PDA,以及消费类产物,仪表,汽车电子和替代机器按钮.本京电港论坛文章先容了SX8633主要特点, 方框架图, 模拟传感器接口框架图, 典范应用电路以及触摸+靠近模块电路原理图纸. 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. The SX8633 incorporates a versatile firmware that was specially designed to simplify capacitive touch solution design and offers reduced time-to-market.Integrated multi-time programmable memory provides the ultimate flexibility to modify key firmware parameters (gain, threshold, scan period, auto offset compensation… ) in the field without the need for new firmware development. The SX8633 supports the 400 kHz I²C serial bus data protocol and includes a field programmable slave address. The tiny 5mm x 5mm footprint makes it an ideal solution for portable, battery powered applications where power and density are at a premium. SX8633主要特点: Complete twelve Sensors Capacitive Touch Controller for Buttons Pre-configured for eight Buttons Eight LED Drivers with Individual Intensity, Fading Control and Autolight Mode 256 steps PWM Linear and Logarithmic control Proximity Sensing up to several centimetres High Resolution Capacitive Sensing Up to 100pF of Offset Capacitance Compensation at Full Sensitivity Capable of Sensing through Overlay Materials up to 5mm thick Extremely Low Power Optimized for Portable Application 8uA (typ) in Sleep Mode 80uA (typ) in Doze Mode (Scanning Period 195ms) 220uA (typ) in Active Mode (Scanning Period 30ms) Programmable Scanning Period from 15ms to 1500ms Auto Offset Compensation Eliminates False Triggers due to Environmental Factors (Temperature, Humidity) Initiated on Power-up and Configurable Intervals Multi-Time In-Field Programmable Firmware Parameters for Ultimate Flexibility On-chip user programmable memory for fast, self contained start-up "Smart" Wake-up Sequence for Easy Activation from Doze No External Components per Sensor Input Internal Clock Requires No External Components Differential Sensor Sampling for Reduced EMI 400 KHz Fast-Mode I²C Interface with Interrupt -40℃ to +85℃ Operation SX8633应用: Notebook/Netbook/Portable/Handheld computers Cell phones, PDAs Consumer Products, Instrumentation, Automotive Mechanical Button Replacement |
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