另外，你用的是低功耗系列吗？CY8C20xx6A功耗比较低
http://www.cypress.com/?id=1413
CY8C20xx6A family is the newest and lowest power, 1.8V CapSense solution from Cypress, the world leader in Touch Sensing. This family is geared towards battery-powered applications such as Handheld Devices, Mobile, Bluetooth Headsets and towards wall-plugged applications sensitive to electrical noise such as Printers, LCD TVs and Monitors. The 20xx6A family is enabled with SmartSense automatic tuning technology that makes capsense designs easier than ever to use.
Key Features:
> 1.71V to 5.5V Core Voltage
> Ultra-low 1µA Standy Current
> Enabled with SmartSense self-tuning technology
> Up to 33 CapSense I/Os and 6 sliders
> Wide range of interface support : I2C, SPI, USB 2.0
> Robust noise-immunity to Rf and AC Line Noise
> Wide variety of flash sizes : 8K, 16K, 32K
> Wide range of packages : 16QFN (3x3mm) to 48QFN (7x7mm)
> Water tolerant sensing
> Proximity sensing
> Patented CSD technology for robust immunity to conducted and radiated noise
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