原标题：Infineon XMC1200 RGB LED照明解决方案

　　infineon公司的XMC1200是工业应用的微控制器(MCU)系列产品,内核是高性能32位ARM Cortex-M0 CPU,集成了8KB ROM,16KB 高速SRAM和多达200KB程序和数据闪存,多种通信接口和模拟前端接口和工业控制接口.本文介绍了XMC1200主要特性,框图,以及XMC1200 RGB LED照明板主要特性,电路图,材料清单,PCB元件布局图和设计文件图.

　　The XMC1200 devices are members of the XMC1000 family of microcontrollers basedon the ARM Cortex-M0 processor core. The XMC1200 series devices are optimized forLED Lighting and Human-Machine interface (HMI) applications.

　　XMC1200主要特性:

　　CPU Subsystem

　　• CPU Core

　　– High Performance 32-bit ARM Cortex-M0 CPU

　　– Most of 16-bit Thumb instruction set

　　– Subset of 32-bit Thumb2 instruction set

　　– High code density with 32-bit performance

　　– Single cycle 32-bit hardware multiplier

　　– System timer (SysTick) for Operating System support

　　– Ultra low power consumption

　　• Nested Vectored Interrupt Controller (NVIC)

　　• Event Request Unit (ERU) for programmable processing of external and internalservice requests

　　On-Chip Memories

　　• 8 kbytes on-chip ROM

　　• 16 kbytes on-chip high-speed SRAM

　　• up to 200 kbytes on-chip Flash program and data memory

　　Communication Peripherals

　　• Two Universal Serial Interface Channels (USIC), usable as UART, double-SPI,quad-SPI, IIC, IIS and LIN interfaces

　　• LED and Touch-Sense Controller (LEDTS) for Human-Machine interface

　　Analog Frontend Peripherals

　　• A/D Converters, up to 12 channels, includes 2 sample and hold stages and a fast 12-bit analog to digital converter with adjustable gain

　　• Up to 8 channels of out of range comparators (ORC)

　　• Up to 3 fast analog comparators (ACMP)

　　• Temperature Sensor (TSE)

　　Industrial Control Peripherals

　　• Capture/Compare Units 4 (CCU4) for use as general purpose timers

　　• Brightness and Colour Control Unit (BCCU), for LED color and dimming application

　　System Control

　　• Window Watchdog Timer (WDT) for safety sensitive applications

　　• Real Time Clock module with alarm support (RTC)

　　• System Control Unit (SCU) for system configuration and control

　　• Pseudo random number generator (PRNG), provides random data with fastgeneration times

　　Input/Output Lines

　　• Programmable port driver control module (PORTS)

　　• Individual bit addressability

　　• Tri-stated in input mode

　　• Push/pull or open drain output mode

　　• Configurable pad hysteresis

　　On-Chip Debug Support

　　• Support for debug features: 4 breakpoints, 2 watchpoints

　　• Various interfaces: ARM serial wire debug (SWD), single pin debug (SPD)

　　图1.XMC1200框图

　　XMC1200 RGB LED照明板

　　The RGB LED Shield uses high frequency peak-current control with fixed off-times to generate DCLED currents. Although this is highly efficient, low cost, and is suitable for high-speed dimming, itresults in the output current being dependent on the input and output voltage ratio. The output currentcan be adjusted by configuring the peak-current reference and off-time parameters.

　　A virgin RGB LED Shield is pre-configured with safe peak-current reference and off-time parameters.

　　With the safe parameters, the LED current will not be ‘too high’ at high input voltages.The safe parameter values have been tested with LED loads that have a forward voltage of 6V atinput voltages up to 48V. At this input, the pre-configured average LED current is measured up to300mA.

　　The RGB LED Lighting Shield adds brilliant flicker-free light control to Arduino projects. The Shieldcommunicates with a master board via the I2C protocol as a slave. Either an Arduino Uno R3 or theXMC1100 Boot Kit from Infineon can be used as the master.

　　On board the RGB LED Shield is an XMC1202 microcontroller, featuring a dimming control peripheralfor LED lighting applications, known as the Brightness and Colour Control Unit (BCCU). It contains 3independent dimming engines and 9 independent Pulse Density Modulated (PDM) channels.

　　1 dimming engine and 6 channels are used in this shield.

　　There are 10 basic sets of I2C commands to control the shield from the master board, and so controlthe connected LED Lamp with various lighting effects. There are 22 user configurable parametersand the freedom to connect different LED Lamps.

　　The RGB LED Lighting Shield can be easily connected to any Arduino board or the XMC1100 boot Kitvia headers and DMX512 control is enabled as a mounting option using an interface chip.

　　XMC1200 RGB LED照明板主要特性:

　　 Behaves as an I2C slave.

　　−An Arduino Uno R3, XMC1100 Boot Kit, or similar board connected to the shield can

　　communicate via the SDA and SCL pins as the master.

　　 Drives and dims up to 3 LED strings with constant current.

　　 Able to change the colour of a connected LED lamp(if the strings are of different colours; forexample red, green, blue).

　　 High speed flicker-free modulation dimming on each string with Pulse-Density Modulation (PDM).

　　 Very high power density due to high switching frequency, leading to a small area.

　　 Up to 48VDC input.

　　−The RGB LED Shield is a DC-DC buck LED driver so the input voltage must be higher than theforward voltage of the LED strings.

　　 Configurable current amplitude.

　　 Up to 700mA average current on each string.

　　 Configurable current ripple.

　　 I²C interface with configurable 10-bit slave address (with a default value of 0x15E)

　　to increases the range of devices that can be connected to the bus line.

　　图2.XMC1200 RGB LED照明板外形图