原标题：Lattice iCE40 UltraLite FPGA大电流LED驱动解决方案

　　lattice公司的iCE40 UltraLite系列FPGA是具有最佳逻辑,最小占位尺寸和低I/O数的超低功耗FPGA和传感器管理器.最适合于超低功耗的移动应用如智能手机,平板电脑和手持设备.本文介绍了iCE40 UltraLite系列FPGA主要特性,框图,以及用来演示iCE40 UltraLite FPGA大电流LED驱动能力的iCE40 UltraLite™ 分接板主要特性,框图,电路图和材料清单.

　　iCE40 UltraLite family is an optimum logic, smallest footprint, low I/O count ultra-low power FPGA and sensor manager with instant on capability. It is designed for ultra-low power mobile applications, such as smartphones, tablets and hand-held devices. The iCE40 UltraLite family includes integrated blocks to interface with virtually all mobile sensors and application processors. The iCE40 UltraLite family also features two on-chip oscillators, 9.7 kHz and 48 MHz. The LFOSC (9.7 kHz) is ideal for low power function in always-on applications, while HFOSC (48 MHz) can be used for awaken activities. The embedded RGB PWM IP, with the three 24 mA constant current RGB output on the iCE40 UltraLite provides all the necessary logic to directly drive the service LED, without the need of external MOSFET or buffer. The 400 mA constant current IR driver output provides a direct interface to external LED for application such as IrDA functions. Users simply implement the modulation logic that meets their needs, and connect the IR driver directly to the LED, without the need of external MOSFET or buffer. The 100 mA Barcode Emulation driver output provides a direct interface for applications such as barcode scanning. The 100 mA and 400 mA drivers can also be combined to be used as 500 mA IR driver. In this case, they can no longer be separate 400 mA and 100mA drivers. The iCE40 UltraLite family of devices are targeting for mobile applications to perform functions such as IrDA, Service LED, Barcode Emulation, GPIO Expander, SDIO Level Shift, and other custom functions. The iCE40 UltraLite family features two device densities of 640 or 1K Look Up Tables (LUTs) of logic with programmable I/Os that can be used as an interface port or general purpose I/O. It also has up to 56 Kbits of Block RAMs to work with user logic.

　　iCE40 UltraLite主要特性:

　　图1. iCE40 UltraLite框图

　　iCE40 UltraLite™ 分接板

　　This guide describes how to begin using the iCE40 UltraLite Breakout Board, an easy-to-use platform for demonstrating the high-current LED drive capabilities of the iCE40 UltraLite FPGA. Along with the evaluation board and accessories, this kit includes the pre-loaded LED Driver Demo that demonstrates driving the RBG LEDs with a PWM circuit. In addition, most of the device’s I/O balls are accessible via one of the several header locations on the board, facilitating rapid prototyping of user functions. The contents of this user’s guide include demo operation, top-level functional descriptions of the various portions of the evaluation board, descriptions of the on-board connectors, jumpers, a complete set of schematics and the bill of material for the iCE40 UltraLite Breakout Board

　　iCE40 UltraLite™ 分接板主要特性:

　　• iCE40 UltraLite Breakout Board

　　– The iCE40 UltraLite Breakout Board features the following on-board compo-nents and circuits: — iCE40 UltraLite (iCE40UL1K-CM36A) device in a 36-ball WLCSP package.

　　— Example of a board using this 0.35-pitch WLCSP package.

　　— High-current LED output

　　— Infrared transmit

　　— iCE40 UltraLite Current Measurements

　　— Standard USB cable for device programming

　　— RoHS-compliant packaging and process

　　• Pre-loaded Demo

　　– The kit includes a pre-loaded demo to control the onboard RGB LED in conjunction with a software run GUI.

　　• USB Connector Cable

　　– A mini B USB port provides power, a programming interface and communication for the software RGB LED GUI to the iCE40 UltraLite SPI port.

　　图2. iCE40 UltraLite™ 分接板外形图

　　iCE40 UltraLite™ 分接板材料清单: