TLC5615

TLC5615学习笔记（资料补充）TLC5615----10位D/A转换器，串口输入，8P封装：2种封装：DIP和SOP-8；主要内容见：武汉力源电子公司资料和美信MAX515（MAX504）资料。

总体介绍注解：1：TLC5615引脚或者说功能同MAX515。

2：TLC5615为美国德州仪器公司1999年推出的产品。

3：TLC5615 与MAX515的区别：MAX515在先研制成功，TLC5615在后。

MAX515现在的市场售价（正品）：￥8元到￥40元，陶宝上水货最低价也大于6元。

正品价（中间价）20元。

TLC5615现在的市场售价（正品）：￥4元到￥10元，陶宝上水货最低价2元。

正品价（中间价）5元。

所以，现在的学习板（或者说要求不高的地方），大量开始用TLC5615替代MAX515和AD5300。

学习难点总体上不难，具体难处，是因为资料问题：这是因为1：MAX515无中文资料；2：武汉力源电子公司资料《LC5615中文资料》，部分细小节处说明不足；性能指标补充：1：数据输入时钟FSCLK:14MHz(MAX);2:更新速率：1.21MHz；注：实际使用中，考虑到片选信号（实质上是内部由《串行移位寄存器》向《D/A转换寄存器》读入数据）以及片选信号自身时间以及其它因素，实际使用中，更新速率被限制在80KHz以内；3：模拟电压输入，最大输出电流20Ma;4：使用简单，操作方便，外围元件少，（只需要一个基准电压输入）；技术资料注解：1：文件夹中的TLC5615中文资料《中国武汉力源》的PDF资料，要用Acrobat Reader 5.0打开，如果用AcrobatReader 9.0打开，则出现乱码；2：发送数据脉冲格式用SPI传送：2个字节（8位），具体：先传高位，后传送低位。

如下图中从左边开始，向右边传送，■■■■| ■■■■| ■■■■| ■■■■■|4位无效| 高4位| 中4位|前2位是最低有效位，最后2个无用：补0，即：资料上的图11个时序图。

标签：基于AVR的正弦波发生器！【原创】用DA(TLC5615)芯片产生正弦波!附件里是一个好用的工具，《正弦波数据生成器》，精度可调！/************************************************CPU: MEGA64晶振：7.3728M功能：实现频率为25Hz的正弦波************************************************/#include<avr/io.h>#include<util/delay.h>#include<avr/eeprom.h>#include<avr/pgmspace.h>#include<avr/interrupt.h>#define uint8 unsigned char#define int8 signed char#define uint16 unsigned int#define int16 signed int#define uint32 unsigned long#define int32 signed long#define uchar unsigned char#define uint unsigned int/*----------------SPI端口定义-----------------*/#define MMC_SD_CS_DDR DDRB#define MMC_SD_CS_PORT PORTB#define MMC_SD_CS_BIT 0#define MMC_SD_SCK_DDR DDRB#define MMC_SD_SCK_PORT PORTB#define MMC_SD_SCK_BIT 1#define MMC_SD_MOSI_DDR DDRB#define MMC_SD_MOSI_PORT PORTB#define MMC_SD_MOSI_BIT 2#define MMC_SD_MISO_DDR DDRB#define MMC_SD_MISO_PORT PORTB#define MMC_SD_MISO_BIT 3#define MMC_SD_PORT_INI {\MMC_SD_CS_PORT |= 1<<MMC_SD_CS_BIT;\MMC_SD_SCK_PORT |= 1<<MMC_SD_SCK_BIT;\MMC_SD_MOSI_PORT |= 1<<MMC_SD_MOSI_BIT;\MMC_SD_MISO_PORT |= 1<<MMC_SD_MISO_BIT;\\MMC_SD_CS_DDR |= 1<<MMC_SD_CS_BIT;\MMC_SD_SCK_DDR |= 1<<MMC_SD_SCK_BIT;\MMC_SD_MOSI_DDR |= 1<<MMC_SD_MOSI_BIT;\MMC_SD_MISO_DDR &= ~(1<<MMC_SD_MISO_BIT);\}#define SPI_CS_Assert MMC_SD_CS_PORT &= ~(1<<MMC_SD_CS_BI T)#define SPI_CS_Deassert MMC_SD_CS_PORT |= 1<<MMC_SD_CS_BIT uint16 i="0";uint16 t="0";uint8 t1=0,t2=0;/*---------------------正弦波数据表---------------------------*/uint16 wave[1024]={0x1FF,0x202,0x205,0x208,0x20C,0x20F,0x212,0x215,0x218,0x21B,0x21E,0 x221,0x225,0x228,0x22B,0x22E,0x231,0x234,0x237,0x23A,0x23E,0x241,0x244,0x247,0x24A,0x24D,0x250,0 x253,0x256,0x25A,0x25D,0x260,0x263,0x266,0x269,0x26C,0x26F,0x272,0x275,0x278,0x27B,0x27E,0x281,0 x284,0x287,0x28A,0x28D,0x290,0x293,0x296,0x299,0x29C,0x29F,0x2A2,0x2A5,0x2A8,0x2AB,0x2AE,0x2B1, 0x2B4,0x2B7,0x2BA,0x2BD,0x2C0,0x2C3,0x2C6,0x2C9,0x2CB,0x2CE,0x2D1,0x2D4,0x2D7,0x2DA,0x2DD,0x2 DF,0x2E2,0x2E5,0x2E8,0x2EB,0x2ED,0x2F0,0x2F3,0x2F6,0x2F8,0x2FB,0x2FE,0x301,0x303,0x306,0x309,0x30B,0 x30E,0x311,0x313,0x316,0x319,0x31B,0x31E,0x320,0x323,0x326,0x328,0x32B,0x32D,0x330,0x332,0x335,0 x337,0x33A,0x33C,0x33F,0x341,0x343,0x346,0x348,0x34B,0x34D,0x34F,0x352,0x354,0x357,0x359,0x35B,0 x35D,0x360,0x362,0x364,0x366,0x369,0x36B,0x36D,0x36F,0x371,0x374,0x376,0x378,0x37A,0x37C,0x37E,0 x380,0x382,0x384,0x386,0x388,0x38A,0x38C,0x38E,0x390,0x392,0x394,0x396,0x398,0x39A,0x39C,0x39E, 0x39F,0x3A1,0x3A3,0x3A5,0x3A7,0x3A8,0x3AA,0x3AC,0x3AD,0x3AF,0x3B1,0x3B2,0x3B4,0x3B6,0x3B7,0x3B 9,0x3BA,0x3BC,0x3BE,0x3BF,0x3C1,0x3C2,0x3C4,0x3C5,0x3C6,0x3C8,0x3C9,0x3CB,0x3CC,0x3CD,0x3CF,0x3 D0,0x3D1,0x3D3,0x3D4,0x3D5,0x3D6,0x3D8,0x3D9,0x3DA,0x3DB,0x3DC,0x3DD,0x3DE,0x3E0,0x3E1,0x3E2,0x3 E3,0x3E4,0x3E5,0x3E6,0x3E7,0x3E8,0x3E8,0x3E9,0x3EA,0x3EB,0x3EC,0x3ED,0x3EE,0x3EE,0x3EF,0x3F0,0x3F 1,0x3F1,0x3F2,0x3F3,0x3F3,0x3F4,0x3F5,0x3F5,0x3F6,0x3F6,0x3F7,0x3F7,0x3F8,0x3F8,0x3F9,0x3F9,0x3FA,0 x3FA,0x3FB,0x3FB,0x3FB,0x3FC,0x3FC,0x3FC,0x3FD,0x3FD,0x3FD,0x3FD,0x3FE,0x3FE,0x3FE,0x3FE,0x3F E,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3FE,0x3F E,0x3FD,0x3FD,0x3FD,0x3FD,0x3FC,0x3FC,0x3FC,0x3FB,0x3FB,0x3FB,0x3FA,0x3FA,0x3F9,0x3F9,0x3F8,0x3F8, 0x3F7,0x3F7,0x3F6,0x3F6,0x3F5,0x3F5,0x3F4,0x3F3,0x3F3,0x3F2,0x3F1,0x3F1,0x3F0,0x3EF,0x3EE,0x3EE, 0x3ED,0x3EC,0x3EB,0x3EA,0x3E9,0x3E8,0x3E8,0x3E7,0x3E6,0x3E5,0x3E4,0x3E3,0x3E2,0x3E1,0x3E0,0x3DE, 0x3DD,0x3DC,0x3DB,0x3DA,0x3D9,0x3D8,0x3D6,0x3D5,0x3D4,0x3D3,0x3D1,0x3D0,0x3CF,0x3CD,0x3CC,0x3 CB,0x3C9,0x3C8,0x3C6,0x3C5,0x3C4,0x3C2,0x3C1,0x3BF,0x3BE,0x3BC,0x3BA,0x3B9,0x3B7,0x3B6,0x3B4,0x3B 2,0x3B1,0x3AF,0x3AD,0x3AC,0x3AA,0x3A8,0x3A7,0x3A5,0x3A3,0x3A1,0x39F,0x39E,0x39C,0x39A,0x398,0x396, 0x394,0x392,0x390,0x38E,0x38C,0x38A,0x388,0x386,0x384,0x382,0x380,0x37E,0x37C,0x37A,0x378,0x376,0 x374,0x371,0x36F,0x36D,0x36B,0x369,0x366,0x364,0x362,0x360,0x35D,0x35B,0x359,0x357,0x354,0x352,0 x34F,0x34D,0x34B,0x348,0x346,0x343,0x341,0x33F,0x33C,0x33A,0x337,0x335,0x332,0x330,0x32D,0x32B,0 x328,0x326,0x323,0x320,0x31E,0x31B,0x319,0x316,0x313,0x311,0x30E,0x30B,0x309,0x306,0x303,0x301,0 x2FE,0x2FB,0x2F8,0x2F6,0x2F3,0x2F0,0x2ED,0x2EB,0x2E8,0x2E5,0x2E2,0x2DF,0x2DD,0x2DA,0x2D7,0x2D 4,0x2D1,0x2CE,0x2CB,0x2C9,0x2C6,0x2C3,0x2C0,0x2BD,0x2BA,0x2B7,0x2B4,0x2B1,0x2AE,0x2AB,0x2A8,0x2A 5,0x2A2,0x29F,0x29C,0x299,0x296,0x293,0x290,0x28D,0x28A,0x287,0x284,0x281,0x27E,0x27B,0x278,0x275,0 x272,0x26F,0x26C,0x269,0x266,0x263,0x260,0x25D,0x25A,0x256,0x253,0x250,0x24D,0x24A,0x247,0x244,0 x241,0x23E,0x23A,0x237,0x234,0x231,0x22E,0x22B,0x228,0x225,0x221,0x21E,0x21B,0x218,0x215,0x212,0 x20F,0x20C,0x208,0x205,0x202,0x1FF,0x1FC,0x1F9,0x1F6,0x1F2,0x1EF,0x1EC,0x1E9,0x1E6,0x1E3,0x1E0, 0x1DC,0x1D9,0x1D6,0x1D3,0x1D0,0x1CD,0x1CA,0x1C7,0x1C3,0x1C0,0x1BD,0x1BA,0x1B7,0x1B4,0x1B1,0x1A E,0x1AB,0x1A8,0x1A4,0x1A1,0x19E,0x19B,0x198,0x195,0x192,0x18F,0x18C,0x189,0x186,0x183,0x180,0x17D,0 x17A,0x177,0x174,0x171,0x16E,0x16B,0x168,0x165,0x162,0x15F,0x15C,0x159,0x156,0x153,0x150,0x14D,0 x14A,0x147,0x144,0x141,0x13E,0x13B,0x138,0x135,0x133,0x130,0x12D,0x12A,0x127,0x124,0x121,0x11F,0 x11C,0x119,0x116,0x113,0x111,0x10E,0x10B,0x108,0x106,0x103,0x100,0x0FD,0x0FB,0x0F8,0x0F5,0x0F3, 0x0F0,0x0ED,0x0EB,0x0E8,0x0E5,0x0E3,0x0E0,0x0DE,0x0DB,0x0D8,0x0D6,0x0D3,0x0D1,0x0CE,0x0CC,0x0 C9,0x0C7,0x0C4,0x0C2,0x0BF,0x0BD,0x0BB,0x0B8,0x0B6,0x0B3,0x0B1,0x0AF,0x0AC,0x0AA,0x0A7,0x0A5,0x0A 3,0x0A1,0x09E,0x09C,0x09A,0x098,0x095,0x093,0x091,0x08F,0x08D,0x08A,0x088,0x086,0x084,0x082,0x080,0 x07E,0x07C,0x07A,0x078,0x076,0x074,0x072,0x070,0x06E,0x06C,0x06A,0x068,0x066,0x064,0x062,0x060,0 x05F,0x05D,0x05B,0x059,0x057,0x056,0x054,0x052,0x051,0x04F,0x04D,0x04C,0x04A,0x048,0x047,0x045,0 x044,0x042,0x040,0x03F,0x03D,0x03C,0x03A,0x039,0x038,0x036,0x035,0x033,0x032,0x031,0x02F,0x02E,0 x02D,0x02B,0x02A,0x029,0x028,0x026,0x025,0x024,0x023,0x022,0x021,0x020,0x01E,0x01D,0x01C,0x01B,0 x01A,0x019,0x018,0x017,0x016,0x016,0x015,0x014,0x013,0x012,0x011,0x010,0x010,0x00F,0x00E,0x00D,0 x00D,0x00C,0x00B,0x00B,0x00A,0x009,0x009,0x008,0x008,0x007,0x007,0x006,0x006,0x005,0x005,0x004,0x 004,0x003,0x003,0x003,0x002,0x002,0x002,0x001,0x001,0x001,0x001,0x000,0x000,0x000,0x000,0x000,0x 000,0x000,0x000,0x000,0x000,0x000,0x000,0x000,0x000,0x000,0x000,0x000,0x000,0x000,0x000,0x000,0x 001,0x001,0x001,0x001,0x002,0x002,0x002,0x003,0x003,0x003,0x004,0x004,0x005,0x005,0x006,0x006,0x 007,0x007,0x008,0x008,0x009,0x009,0x00A,0x00B,0x00B,0x00C,0x00D,0x00D,0x00E,0x00F,0x010,0x010, 0x011,0x012,0x013,0x014,0x015,0x016,0x016,0x017,0x018,0x019,0x01A,0x01B,0x01C,0x01D,0x01E,0x020,0 x021,0x022,0x023,0x024,0x025,0x026,0x028,0x029,0x02A,0x02B,0x02D,0x02E,0x02F,0x031,0x032,0x033,0 x035,0x036,0x038,0x039,0x03A,0x03C,0x03D,0x03F,0x040,0x042,0x044,0x045,0x047,0x048,0x04A,0x04C,0 x04D,0x04F,0x051,0x052,0x054,0x056,0x057,0x059,0x05B,0x05D,0x05F,0x060,0x062,0x064,0x066,0x068,0 x06A,0x06C,0x06E,0x070,0x072,0x074,0x076,0x078,0x07A,0x07C,0x07E,0x080,0x082,0x084,0x086,0x088,0 x08A,0x08D,0x08F,0x091,0x093,0x095,0x098,0x09A,0x09C,0x09E,0x0A1,0x0A3,0x0A5,0x0A8,0x0AA,0x0AC, 0x0AF,0x0B1,0x0B3,0x0B6,0x0B8,0x0BB,0x0BD,0x0BF,0x0C2,0x0C4,0x0C7,0x0C9,0x0CC,0x0CE,0x0D1,0x0 D3,0x0D6,0x0D8,0x0DB,0x0DE,0x0E0,0x0E3,0x0E5,0x0E8,0x0EB,0x0ED,0x0F0,0x0F3,0x0F5,0x0F8,0x0FB,0x0FD, 0x100,0x103,0x106,0x108,0x10B,0x10E,0x111,0x113,0x116,0x119,0x11C,0x11F,0x121,0x124,0x127,0x12A,0 x12D,0x130,0x133,0x135,0x138,0x13B,0x13E,0x141,0x144,0x147,0x14A,0x14D,0x150,0x153,0x156,0x159,0 x15C,0x15F,0x162,0x165,0x168,0x16B,0x16E,0x171,0x174,0x177,0x17A,0x17D,0x180,0x183,0x186,0x189,0 x18C,0x18F,0x192,0x195,0x198,0x19B,0x19E,0x1A1,0x1A4,0x1A8,0x1AB,0x1AE,0x1B1,0x1B4,0x1B7,0x1BA, 0x1BD,0x1C0,0x1C4,0x1C7,0x1CA,0x1CD,0x1D0,0x1D3,0x1D6,0x1D9,0x1DD,0x1E0,0x1E3,0x1E6,0x1E9,0x1E C,0x1EF,0x1F2,0x1F6,0x1F9,0x1FC};/* spi low speed, below 400KHz */void SPI_Low(void){SPCR &= ~_BV(DORD);SPCR = _BV(SPE)|_BV(MSTR)|_BV(SPR0); SPSR &= ~_BV(SPI2X);}/* spi high speed, not exceed 25MHz */void SPI_High(void){SPCR &= ~_BV(DORD);//MSB在前SPCR = _BV(SPE)|_BV(MSTR);SPSR |= _BV(SPI2X);}/* read and write one byte , full duplex */ uint8 SPI_WriteByte(uint8 val){SPDR = val;while(!(SPSR & _BV(SPIF)));return SPDR;}void SPI_Init(void){MMC_SD_PORT_INI; /* Port Initialize */SPI_High();}void timer0_init(void){cli();TCCR0 = 0x00; //stopASSR = 0x00; //set async modeTCNT0 = 0xDC; //set countOCR0 = 0x24;TCCR0 = 0x02; //start timerTIMSK = 0x01; //timer interrupt sourcessei();}//T/C0中断例程SIGNAL(SIG_OVERFLOW0){TCNT0 = 0xE1;//40ust="wave"[i];t="t"<<2; //此处是重点，为何先左移2位，要搞懂mega64硬件spi模式，同时要搞懂tlc5615的12位数据传输模式。

调试笔记：
1、TLC5615转换精度10bit，转换后输出为电压，最大输出电压为VDD-0.4V，逻辑电压输入5V(+-5%)，若采用5V的逻辑电平，其最大输入电压为4.6V，故参考电压Vref输入必须在0～2.3V范围之内，本仿真实验中取Vref=2.048V；
2、输出电压计算式：
3、TLC5615面向CPU的接口采用SPI串行传输，其最大传输速度为1.21Mhz，DA转换时间为12.5us，故一次写入数据（CS引脚从低电平至高电平跳跃）后，必须延时15us左右才可第二次刷入数据再次启动DA转换，参见
TLC5615-DATASHEET：
....which is a 1.21 MHz update rate. However, the DAC settling time to 10 bits of 12.5 us
limits the update rate to 80 kHz for full-scale input step transitions.
4、DOUT引脚作为MISO引脚或者多个TLC5615级联的串行数据输出；
5、写入转换数据可为12bits格式或者16bits格式（当级联输出时），数据传输高位先发：
6、写时序与SPI兼容；。

TLC5615CP10位电压输出数模转换器中的一个8-terminal包申请书：5V单电源操作电池测试仪器3线串行接口数字偏移和增益调整高阻抗基准输入电池操作/远程工业控制输出电压范围的2倍的机器和运动控制装置参考输入电压内部上电复位低功率消耗的1.75毫瓦最大更新频率为1.21兆赫沉降时间0.5LSB的12.5单调温度引脚兼容MAX515描述：这是一个10位tlc5615电压输出数模转换器（数模转换器）与缓冲参考输入（高阻抗）。

数模转换器的输出电压范围是2倍的参考电压，和数模转换器是单调的。

该装置使用简便，运行从一个单一的供应5五，上电复位功能确保纳入重复启动条件。

数字控制的tlc5615超过三线串行总线，是兼容和容易接口行业标准的微处理器和微控制器装置。

该装置接收一个16位数据字产生模拟输出。

数字输入施密特触发功能高噪声免疫力。

数字通信协议包括了SPI™, QSPI™,Microwire™标准小尺寸的8-terminal开发包允许数字控制的模拟功能空间的关键应用。

其特点是操作TLC5615C为从0到70°C TLC5615I特点是操作从40到85°C功能图表绝对最大额定操作温度范围内保持（除非另有说明）电源电压 (7V)数字输入电压范围………………………………………………– 0.3 V to VDD + 0.3 V 参考输入电压范围………………………………………………– 0.3 V to VDD + 0.3 V 输出电压由外部来源………………………………………………VDD + 0.3 V额定电流………………………………………………20MA工作温度………………………………………………0-70度储存温度………………………………………………-65-150度电气特性的建议操作温度范围内保持，VDD = 5 V ,Vref = 2.048 V（除非另有说明）说明零和全面的剔除影响零代码和量程误差（见文）。

数模转换DAC-TLC5615的Proteus电路仿真发表于2007/1/23 6:05:56调试笔记：1、TLC5615转换精度10bit，转换后输出为电压，最大输出电压为VDD-0.4V，逻辑电压输入5V(+-5%)，若采用5V的逻辑电平，其最大输入电压为4.6V，故参考电压Vref输入必须在0～2.3V范围之内，本仿真实验中取Vref=2.048V；2、输出电压计算式：3、TLC5615面向CPU的接口采用SPI串行传输，其最大传输速度为1.21Mhz，DA转换时间为12.5us，故一次写入数据（CS引脚从低电平至高电平跳跃）后，必须延时15us左右才可第二次刷入数据再次启动DA转换，参见TLC5615-DATASHEET：....which is a 1.21 MHz update rate. However, the DAC settling time to 10 bits of 12.5 uslimits the update rate to 80 kHz for full-scale input step transitions.4、DOUT引脚作为MISO引脚或者多个TLC5615级联的串行数据输出；5、写入转换数据可为12bits格式或者16bits格式（当级联输出时），数据传输高位先发：6、写时序与SPI兼容；7、模块子例程：/******************************************************************************/ /**/** 模块名：-------------------TLC5615.C---------------------------------/** -----------------数模转换子模块-----------------------------*//** 功能描述：/**/** 创建人：huangtiexiong 日期：2006-11-28 *//** 修改人：日期：2006-11-28 *//** 其他说明：/******************************************************************************/ #include "Includes.h" //文件包含/*************************************************模块级变量申明*************************************************/int8u bdata gBitMsb;sbit m7 = gBitMsb^7;int8u bdata gBitLsb;sbit l7 = gBitLsb^7;static void TLC5615_Write_12Bits();/*************************************************子函数定义*************************************************//********************************************************************************** 函数名: static void TLC5615_Write_12Bits()*** 功能描述: 一次向TLC中写入12bit数据；*** 全局变量: gBitMsb：待转换10bit高两位；gBitLsb：10bits的低8位；*** 输入: NO !*** 输出: NO !*** 创建人：huangtiexiong 日期：2006-11-28*** 修改人：日期：2006-11-28*** 函数说明: 内部函数；/******************************************************************************/ static void TLC5615_Write_12Bits(){int8u i;SCL = 0; //置零SCL，为写bit做准备；CS = 0;for(i=0;i<2;i++)//循2次，发送高两位；{if(m7) //高位先发；{SDA = 1; //将数据送出；SCL = 1; //提升时钟，写操作在时钟上升沿触发；SCL = 0; //结束该位传送，为下次写作准备；}else{SDA = 0;SCL = 1;SCL = 0;}gBitMsb <<= 1;}for(i=0;i<8;i++)//循环八次，发送低八位；{if(l7){SDA = 1; //将数据送出；SCL = 1; //提升时钟，写操作在时钟上升沿触发；SCL = 0; //结束该位传送，为下次写作准备；}else{SDA = 0;SCL = 1;SCL = 0;}gBitLsb <<= 1;}for(i=0;i<2;i++)//循环2次，发送两个虚拟位；{SDA = 0;SCL = 1;SCL = 0;}CS = 1;SCL = 0;}/********************************************************************************** 函数名: extern void TLC5615_Start(int16u dacDat)*** 功能描述: 启动DAC转换；*** 全局变量: gBitMsb：待转换10bit高两位；gBitLsb：10bits的低8位；*** 输入: dacDat：int16u；*** 输出: NO !*** 创建人：huangtiexiong 日期：2006-11-28*** 修改人：日期：2006-11-28*** 函数说明: 外部函数；/******************************************************************************/ extern void TLC5615_Start(int16u dacDat){dacDat %= 1024;gBitMsb = dacDat/256;gBitLsb = dacDat%256;gBitMsb <<= 6;TLC5615_Write_12Bits();}/******************************************************************************* **** End Of File*******************************************************************************/ 8、Proteus仿真抓图：。

TLC5615是具有串行接口的数模转换器，其输出为电压型，最大输出电压是基准电压值的两倍。

带有上电复位功能，即把DAC寄存器复位至全零。

1TLC5615的特点
（1）10位CMOS电压输出；
（2）5V单电源供电；
（3）与CPU三线串行接口；
（4）最大输出电压可达基准电压的二倍；
（5）输出电压具有和基准电压相同极性；
（6）建立时间12 5μs；
（7）内部上电复位；
（8）低功耗，最大仅1 75mW。

一、TLC5615引脚图
——脚1DIN：串行数据输入端；
——脚2SCLK：串行时钟输入端；
——脚3CS：芯片选用通端，低电平有效；
——脚4DOUT：用于级联时的串行数据输出端；
——脚5AGND：模拟地；
——脚6REFIN：基准电压输入端；
——脚7OUT：DAC模拟电压输出端；
——脚8VDD：正电源端。

二、TLC5615内部功能模块
三、TLC5615时序图。

数控直流电流源林彩莲黎智华周双强(广西师范大学物理与信息工程学院创新基地桂林 541004 )摘要本数控直流电流源以单片机A T89Ｓ51为控制核心，由D/A转换器TLC5615、A/D转换器TLC2543、中文字库液晶显示块、放大电路和大功率调整电路组成。

通过4x4键盘输入给定值，由D/A转换器将数字信号转换成模拟信号，经D/A输出电压作为恒流源的参考电压，以ＬＭＯＰ０７作为电压跟随器，利用晶体管平坦的输出特性得到恒定的电流输出，最后用中文液晶显示输出。

本系统采用单片机作为控制中心，产生数字可调的直流电流源。

其内部4K flash memory 用于存储应用程序。

键盘用于设定电流源的值。

键盘为4x4结构，采用反转法读取键盘值。

P３口的低四位接键盘的行线，P３口的高四位接键盘的列线．图中数模转换器D/A与其右边部分的电路构成恒流源。

D/A输出电压作为恒流源的参考电压，ＬＭＯＰ０７成电压跟随器。

利用晶体管平坦的输出特性即可得到恒流输出。

由于跟随器是一种深度的电压负反馈电路，因此电流源具有较好的稳定性。

为了提高稳定度，D/A 部分的参考电压采用ＬＭ３３６的参考电压。

R2采用大线径康铜丝制作，康铜丝温度系数很小（5ppm/o C）,大线径可使其温度影响减至最小。

单片机系统仅需5V，0.5A电源即可，电源只供单片机完成键盘输入显示，D/A等控制功能。

电流源的电源由V+提供，普通任何一种直流稳压电源都可满足要求。

作者使用的是0～１0V,0~２A的直流文要电源，恒流源最大电流可达２A。

一、方案论证与比较方案一：数模转换器采用通用的ＤＡＣ０８０９，摸数转换器采用ＡＤ０８３２，调整管用ＴＩＰ４１C．方案二：数模转换器采用美国德州仪器公司的TLC5615IP，它使带由缓冲基准输入的10位电压输出数模转换器(DAC)。

DAC具有基准电压两倍的输出范围，且DAC使单调变化的。

器件使用简单，用单5V 电源工作。

方案比较：方案一的电路能实现功能，但硬件电路复杂，逻辑电路设繁琐，调试困难，A/D、D/A采用并行转换器，占用单片机口线资源较多，处理数据的精度不够。