原标题：Silabs C8051F97x低功耗电容触摸MCU开发方案

　　Silabs公司的C8051F97x是全集成的混合信号系统级(SoC) MCU,有多达32kB闪存,采用低功耗技术,在电容触摸解决方案中具有最高的性能和最低功耗.器件具有43个电容触摸点输入,32kB闪存,8kB RAM,7个DMA通路和一个16x16 MAC,主要用在仪表触摸屏,零售机,游戏系统, 家用电器,HVAC,玩具,传真机/打印机/扫描仪触摸屏和键盘.本文介绍了C8051F97x系列主要特性,框图以及C8051F970开发板主要特性,电路图和材料清单.

　　The C8051F97x MCU family combines Silicon Labs’ proven low power technology for the longest battery life of any MCU in its class with the industry’s highest performance and lowest power capacitive sensing solution to address the rapidly-growing human interface application market. The C8051F97x expands the capabilities of the popular C8051F99x low power capacitive sense family with up to 43 capacitive sensing inputs, 32 kB flash, 8 kB RAM, 7 DMA channels and a 16x16 MAC in packages as small as 4 mm x 4 mm. Both families offer the industry’s leading capacitive sensing with sub micro-amp (<1 µA) wake on touch average current and unmatched 100:1 dynamic range to support buttons, sliders, touch pads, and capacitive proximity sensing. Simplicity Studio, a comprehensive development environment, is offered to help the quickly develop applications. Demos, examples and the Capacitive Sense Profiler are offered with Simplicity Studio to make simple the development of capacitive touch sensing solutions.

　　C8051F97x系列主要特性:

　　High-speed pipelined 8051-compatible microcontroller core (up to 25 MIPS)

　　Industry’s lowest active & sleep currents

　　200 µA/MHz active mode

　　55 nA sleep mode with brown-out protection

　　280 nA sleep mode with internal oscillator

　　43 input charge timing capacitance to digital converter

　　12-bit 75 ksps single-ended ADC

　　Precision calibrated 24.5 MHz internal oscillator

　　SmaRTClock oscillator

　　Up to 32 kB of on-chip Flash memory

　　Up to 8 kB of on-chip RAM

　　Implemented, SMBus I2C, UART, SPI, and High-Speed I2C Slave serial interfaces

　　Four general-purpose 16-bit timers

　　Programmable Counter/Timer Array (PCA)

　　On-chip internal voltage reference

　　On-chip watchdog timer

　　On-chip power-on reset and supply monitor

　　Up to 43 general purpose I/O

　　In-system, full-speed, non-intrusive debug interface (on-chip)

　　One-cycle 16 x 16 Multiply and Accumulate module

　　7 channel Direct Memory Access (DMA) module

　　C8051F97x系列应用:

　　Instrumentation panels

　　Touch panels

　　Kiosks

　　Gaming Systems

　　Industrial interface

　　Security

　　Residential HVAC

　　Home appliances

　　Toys

　　Keyboards

　　Fax/printer/scanner front panels

　　图1. C8051F97x系列功能框图

　　图2. C8051F97x系列框图(QFN-48)

　　C8051F970开发板

　　The C8051F970 Development Kit provides an evaluation and development platform for the C8051F97x MCUs.

　　The board has a particular focus on capacitive sensing to highlight the 43 Capacitive Sense input channels available on the C8051F970 MCU.

　　C8051F970开发板主要特性:

　　Silicon Labs EFM32 C8051F970 microcontroller with 32 kB flash and 8 kB RAM.

　　Capacitive sensing 4 x 5 button matrix and slider highlight the unique Capacitive Sense module.

　　Isolated power domains for the LEDs and the MCU to enable easy power measurement.

　　Port headers for prototyping of custom hardware.

　　图3. C8051F970目标板特性

　　图4. C8051F970目标板硬件建立图

　　C8051F970目标板材料清单: