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| Freescale RS08KA高亮LED解决方案 | |||||
作者：Freescal… 文章来源：Freescale 点击数： 更新时间：2007-12-24  |
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Innovative HBLED solutions are rapidly gaining popularity in low-cost applications that require an extremely cost-effective bill-of-materials. However, low-end HBLED applications still require a high level of system control as well as high constant-current to maintain color integrity and high light output. Freescale’s general-purpose ultra-low-end KA2 8-bit MCU offers an economical solution for this application. The on-chip analog comparator is designed to provide an accurate current measurement, which allows feedback control to maintain a constant level in the LED forward current. MC9RS08KA2 Controlled High-Brightness LED  The MC9RS08KA2 Series microcontroller unit (MCU) is an extremely low-cost, small pin count device for home appliances, toys, and small geometry applications. This device is composed of standard on-chip modules including, a very small and highly efficient RS08 CPU core, 63 bytes RAM, 2K bytes Flash, an 8-bit modulo timer, keyboard interrupt, and analog comparator. The device is available in small 6- and 8-pin packages.  图1。MC9RS08KA2系列方框图 MC9RS08KA2 主要特性： 8-Bit RS08 Central Processor Unit (CPU) Simplified S08 instruction set with added high-performance instructions LDA, STA, and CLR instructions support the short addressing mode; address $0000 to $001F can be accessed via a single-byte instruction ADD, SUB, INC, and DEC instructions support the tiny addressing mode; address $0000 to $000F can be accessed via a single-byte instruction with reduced instruction cycle Shadow PC register instructions: SHA and SLA Pending interrupt indication Index addressing via D[X] and X register Direct page access to the entire memory map through paging window Memory On-chip Flash EEPROM MC9RS08KA2: 2048 bytes MC9RS08KA1: 1024 bytes 63 bytes on-chip RAM Power-Saving Modes Wait and stop Wakeup from power-saving modes using real-time interrupt (RTI), KBI, or ACMP Clock Source ICS — Trimmable 20-MHz internal clock source Up to 10-MHz internal bus operation 0.2% trimmable resolution, 2% deviation over temperature and voltage range System Protection Computer operating properly (COP) reset running off bus-independent clock source Low-voltage detection with reset or stop wakeup Peripherals MTIM — 8-bit modulo timer ACMP — Analog comparator Full rail-to-rail supply operation Option to compare to fixed internal bandgap reference voltage Can operate in stop mode KBI — Keyboard interrupt ports Three KBI ports in 6-pin package Five KBI ports in 8-pin package Development Support Background debug system Breakpoint capability to allow single breakpoint setting during in-circuit debug Package Options 6-pin dual flat no lead (DFN) package Two general-purpose input/output (I/O)pins One general-purpose input pin One general-purpose output pin 8-pin plastic dual in-line pin (PDIP) package Four general-purpose input/output (I/O) pins One general-purpose input pin One general-purpose output pin 8-pin narrow body SOIC package Four general-purpose input/output (I/O) pins One general-purpose input pin One general-purpose output pin Innovative HBLED solutions are rapidly gaining popularity in low-cost applications that require an extremely cost-effective bill-of-materials. However, low-end HBLED applications still require a high level of system control as well as high constant-current to maintain color integrity and high light output. Freescale’s general-purpose ultra-low-end KA2 8-bit MCU offers an economical solution for this application. The on-chip analog comparator is designed to provide an accurate current measurement, which allows feedback control to maintain a constant level in the LED forward current. KA2 HBLED Demo Freescale demonstrates its ability to control the HBLED with a KA2 demo unit based on a buck topology switching power supply. This maximizes energy transfer between the battery and the HBLED. The KA2 microcontroller is used to measure the current through its on-chip analog comparator, then uses that feedback to control luminosity intensity on the LED. The user can toggle between two MCU-controlled potential divider settings to vary the LED brightness levels. The demo unit also includes an open-source BDM interface for easy firmware evaluation. 下图是MC9RS08KA2控制的高亮LED电路图。 
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