方案描述：

本方案采用Renesas R8C单片机，适合在成本、功能、低功耗、小型化方面要求颇高的LED照明器具。 LED照明主要是有几个白色发光二极管模块构成的照明器具。节能转换效率与普通灯泡相比具有绝对性的优势，又因为低功耗而抑制了发热量，再加上高亮度?使用长寿命的特点，作为环保产品而受到关注。此外，有些产品还带有调光功能?调色功能，逐渐作为家用智能照明器具问世。 LED照明灯具里，底灯，吊灯，投射灯等装饰用，反射用途的LED照明灯具可以完全胜任于任何场合，包括美术馆，博物馆等对颜色度要求较高的场所。但是对于商场，写字楼等大规模设施来说，作为大范围照明的LED灯具虽然已经诞生，但是其指向性(LED芯片发出的光是直线，发散性不好)太高，造成大面积内设计平均的照度很困难。灯管型LED照明灯具排列过密，设计成本过高，失去节能效果。因此，现阶段装饰用途场合，LED照明灯具完全可用，大面积室内照明还不成熟。

　　方案设计图：

方案关键器件表：

【UPD78f8025】

The µPD78F8024,78F8025 microcontroller has a wide input voltage range from 9 to 38V and supports both buck and boost topologies to drive up to 40 high-power LEDs at currents reaching over 1.5A.

Key Features:

Operating voltage: VDD = 1.8 to 5.5 V - When using the constant current driver: VDD = CVDD = 4.5 to 5.5 V

Max. Operating frequency: 20 MHz

ROM capacities: 8 KB and 32 KB

RAM capacities: 512 bytes and 1 KB

On-chip constant current driver with selectable buck or boost converter

Minimum instruction execution time can be changed from high speed (0.1 μs: @ 20 MHz operation with main system clock) to low speed (1.6 μs: @ 2 MHz operation with main system clock)

General-purpose register: 8 bits x 32 registers (8 bits x 8 registers x 4 banks)

On-chip single-power-supply flash memory

Self-programming (with boot swap function)

On-chip power-on-clear (POC) circuit and low-voltage detector (LVI)

On-chip watchdog timer (operable with the on-chip internal low-speed oscillation clock)

I/O ports: 23 (N-ch open drain: 2)

Timer: 6 channels

16-bit timer/event counter: 1 channel - 8-bit timer/event counter: 2 channels - 8-bit timer: 2 channels - Watchdog timer: 1 channel

Serial interface: 3 channels

UART (LIN (Local Interconnect Network)-bus supported): 1 channel

CSI/UART: 1 channel

I2C: 1 channel

10-bit resolution A/D converter (AVREF = 2.3 to 5.5 V): 4 channels

Operating ambient temperature: TA = -40 to +85°C

方案文档下载：

CR5AS-12.pdf 

RJK5030DPD.pdf   

RKZ_Series.pdf