Renesas公司的78K0/Ix2 8 位單片微控制器系列包括78K0/IY2, 78K0/IA2和78K0/IB2,采用78K0 CPU 內(nèi)核,高速時(shí)鐘可達(dá)10MHz, 電源電壓 VDD = 2.7 至5.5 V,VDD為5V時(shí)的工作模式電流為350 μA, STOP模式的電流為0.58 μA,主要用于LED照明控制.本文介紹了78K0/Ix2 8 位單片微控制器主要特性,方框圖,以及78K0/IB2 PFC LED照明評(píng)估板主要特性, LED照明系統(tǒng)框圖,電路圖和相應(yīng)的材料清單.

78K0/Ix2 8 位單片微控制器主要特性:

56443 . 78K0 CPU 內(nèi)核

56443 . I/O 端口，ROM 和RAM 容量



低功耗 (VDD = 5.0 V)

• 內(nèi)部高速振蕩工作模式: 350 μA (TYP.) (工作在fCPU = 1 MHz )

• STOP 模式: 0.58 μA (TYP.) (工作在fIL = 30 kHz )

Clock

• 高速系統(tǒng)時(shí)鐘 … 可從以下四種時(shí)鐘源中選擇

- 陶瓷/晶體振蕩器： 1 至 10 MHz

- 外部時(shí)鐘： 1 至 10 MHz 注

- 內(nèi)部高速振蕩器： 4 MHz ± 2 % （–20 至 +70℃）注，或8 MHz ± 5 %（–40 至 +85℃）

- 16 位定時(shí)器X0 和X1 的時(shí)鐘： 40 MHz （典型值） （使用 PLL 時(shí)）

• 內(nèi)部低速振蕩器 30 kHz ± 10 % … 看門(mén)狗定時(shí)器，間歇操作中的定時(shí)器時(shí)鐘

定時(shí)器

• 16 位定時(shí)器X … PWM 輸出（40 MHz （MAX.） 時(shí)鐘工作），與外部信號(hào)聯(lián)動(dòng)操作，多達(dá)四個(gè)通道的同步輸出，觸發(fā)A/D 轉(zhuǎn)換

• 16 位定時(shí)器/事件計(jì)數(shù)器 … PPG 輸出，捕獲輸入，外部事件計(jì)數(shù)器輸入

• 8 位定時(shí)器H1 … PWM 輸出，可工作于內(nèi)部低速振蕩時(shí)鐘

• 8 位定時(shí)器/事件計(jì)數(shù)器 51 … 外部事件計(jì)數(shù)器輸入

• 看門(mén)狗定時(shí)器 … 可在內(nèi)部低速振蕩時(shí)鐘下工作



串行接口

• UART6 … 異步2-線串行接口

• DALI … 用于照明控制（從模式）的2-線串行接口

• IICA … 時(shí)鐘同步2-線串行接口，支持多主機(jī)通信

從模式下可通過(guò)地址匹配釋放待機(jī)模式

• CSI11 … 時(shí)鐘同步3-線串行接口，從模式下可作為SPI 操作



乘法器 （8 位× 8 位 = 16 位， 16 位× 16 位 = 32 位， 1 個(gè)時(shí)鐘工作）

10 位分辨率的A/D 轉(zhuǎn)換

• 78K0/IY2： 5 通道

• 78K0/IA2： 6 通道

• 78K0/IB2： 9 通道

運(yùn)算放大器 （僅限于內(nèi)置運(yùn)算放大器的產(chǎn)品）： 1 通道

比較器： 3 通道

上電清零電路（POC）

低電壓檢測(cè)電路（LVI） （當(dāng)達(dá)到檢測(cè)電壓時(shí)產(chǎn)生中斷/復(fù)位（可選擇））

• 檢測(cè)電壓： 可從 2.84 和4.22 V 間的十個(gè)等級(jí)中選擇在設(shè)置 LVI 默認(rèn)開(kāi)始后，僅當(dāng)開(kāi)啟電源時(shí)使用1.91 V。

單電源 flash 存儲(chǔ)器

• 允許 Flash 自編程

• 軟件保護(hù)功能：防止外部拷貝（沒(méi)有 flash 讀取命令）

安全功能

• 看門(mén)狗定時(shí)器使用獨(dú)立于 CPU 的時(shí)鐘工作即使系統(tǒng)時(shí)鐘停止時(shí)也可檢測(cè)到異常

• 用 LVI 可檢測(cè)供應(yīng)電壓下降在供應(yīng)電壓下降到低于工作電壓前進(jìn)行適當(dāng)?shù)奶幚?br />
• 具有選項(xiàng)字節(jié)功能重要的系統(tǒng)操作在硬件中設(shè)置

片上調(diào)試功能 …用于目標(biāo)器件的控制，以及引用內(nèi)存

支持匯編語(yǔ)言和 C 語(yǔ)言

提升開(kāi)發(fā)環(huán)境（開(kāi)發(fā)中）

• 支持全功能仿真器（IECUBE）， 和簡(jiǎn)易仿真器（MINICUBE2）

電源供應(yīng)電壓： VDD = 2.7 至5.5 V

運(yùn)行環(huán)境溫度： TA = –40 至 +105℃

圖1.78K0/IY2方框圖

圖2.78K0/IA2方框圖

圖3.78K0/IB2方框圖

78K0/IB2 PFC LED照明評(píng)估板

78K0/IB2 PFC LED Lighting Evaluation Board

Lighting accounts for about 16% of domestic household power consumption

The use of LED’s in lighting has been increasingly popular in recent years due to the reduction of CO2 emissions and the needs for energy saving. This is because LED lighting has higher luminance efficiency and a longer life than the conventional incandescent bulbs or fluorescent lights. For energy saving in systems, there are greater
needs for optimal ON/OFF control and dimming control for lighting using communication and sensors, and lighting system control with microcontrollers is required. On the other hand, there are greater needs for low costs for promoting LED lighting. There have been many cases in which board platforms are used to reduce development man-hours or the functions of analog control IC’s are built into a microcontroller.

With these needs, this application note describes the features, system configuration, and control methods of LED lighting system with the 78K0/Ix2 microcontroller by using the LED lighting evaluation board with PFC control EZ-0011 (Photo 1-1) as an example. To purchase the EZ-0011, contact Renesas Electronics sales office or Distributor.

78K0/Ix2 LED照明控制系統(tǒng)主要特性:

Features of LED Lighting System Control with 78K0/Ix2

The LED lighting system with the 78K0/Ix2 microcontroller has the following features:

Allows LED constant current/dimming control of up to 6 channels with the timer output function of the 16-bit timers X0, X1, 00 and 8-bit timer H1. This eliminates the need for an IC for LED constant current control, reducing the cost of the set.

Allows power factor correction (PFC) control with the timer restart function that works with the comparator of the 16-bit timer X0. This eliminates the need for an IC for PFC control, reducing the cost of the set.

Realizes the protective function that causes emergency stop of PWM output immediately (without the CPU) in case of a detection of overcurrent or overvoltage in the LED or PFC control part by using the high impedance output function that works with the comparator of the 16-bit timers X0 and X1. This eliminates the need for a dedicated protective circuit with an external comparator, reducing the cost of the set.

Furthermore, operation after the emergency stop can be controlled by software, realizing a flexible protective function according to the system.

Realizes transmission and reception of Manchester codes (transmission: 11 bits, reception: 19 bits) in compliance with the DALI communication standard with built-in hardware by using the DALI communication slave function of the serial interface UART6/DALI. This can reduce CPU load during data transmission and reception.

The reception pin RxD6 of the serial interface UART6/DALI can be connected to the external interrupt pin INTP0 and the capture input pin TI000 of the 16-bit timer 00 inside the microcontroller. This realizes stand-by mode cancellation during the break period reception (low level for 88 μs to 1 s) of DMX512 communication as well as pulse width measurement during the break period.

Realizes pulse width measurement during infrared remote control signal reception Note with hardware by using the pulse width measurement function of the 16-bit timer 00. This can reduce CPU load during data reception.

Flexibly realizes time management and control during sensor detection Note with software processing of the Microcontroller.

圖4.采用78K0/Ix2 MCU的LED照明系統(tǒng)框圖

圖5.用于LED恒流控制的反激轉(zhuǎn)換器l
Example of Fly-back Converter Type PFC Circuit Configuration with 78K0/Ix2 Microcontroller

圖6.采用78K0/Ix2 MCU的LED照明系統(tǒng)外形圖

圖7.采用78K0/Ix2 MCU的LED照明系統(tǒng)電路圖
采用78K0/Ix2 MCU的LED照明系統(tǒng)材料清單:



詳情請(qǐng)見(jiàn):
http://www2.renesas.com/maps_download/pdf/U19353CA3V0UD00.pdf
和
http://www2.renesas.com/micro/en/solution/data/EZ-PFCLED-002_Schematic.pdf
以及
http://www2.renesas.com/micro/en/solution/data/ZBB-CB-11-0021-E.pdf
和
http://www2.renesas.com/maps_download/pdf/R01AN0674EJ0100_78K0IX2.pdf