Semtech | SX8635EVK

The SX8635EVK is an Evaluation Board for ultra low power, fully integrated 12-channel solution for capacitive touch-buttons and wheel with proximity detection applications. Unlike many capacitive touch solutions, the SX8635 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.

Features:

• Complete Twelve Sensors Capacitive Touch Controller for
• Buttons and Wheel
• Pre-configured for 6 Buttons and a Wheel
• 12 LED Drivers with Individual Intensity, Fading Control and Autolight Mode
• 256 steps PWM Linear and Logarithmic control
• Proximity Sensing up to several centimeters
• 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
• 8 uA (typ) in Sleep Mode
• 80 uA (typ) in Doze Mode (Scanning Period 195 ms)
• 220 uA (typ) in Active Mode (Scanning Period 30 ms)
• Programmable Scanning Period from 15 ms to 1500 ms
• 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°C to +85°C Operation

Applications:

• Notebook/Netbook/Portable/Handheld computers
• Cell phones, PDAs
• Consumer Products, Instrumentation, Automotive
• Mechanical Button Replacement