复位芯片7705ac

ad7706,ad7705中文资料,工作原理，C语言接口程序，引脚图，管脚工作原理：AD7705/06以及AD7707是比较典型的一种16位A/D转换芯片。

AD7705/06芯片是带有自校正功能的Σ-Δ于A/D转换器。

其内部由多路模拟开关、缓冲器、可编程增益放大器（PGA）、Σ-Δ调制器、数字滤波器、基准电压输入、时钟电路及串行接口组成。

其中串行接口包括寄存器组，它由通讯寄存器、设置寄存器、时钟寄存器、数据输出寄存器、零点校正寄存器和满程校正寄存器等组成。

该芯片还包括2通道差分输入（AD7705）和3种伪差分通道输入（AD7706）。

AD7705/06的PGA可通过指令设定，对不同幅度的输入信号实现1、2、4、8、16、32、64和128倍的放大，因此AD7705/ 06芯片既可接受从传感器送来的低电平输入信号，亦可接受高电平（10V）信号，它运用Σ―Δ技术实现16位无误码性能；它的输出速度同样可由指令设定，范围由20Hz到500Hz；它能够通过指令设定对零点和满程进行校正；AD7705/06与微处理器的数据传送通过串行方式进行，采用了节省端口线的通讯方式，最少只占用控制机的两条端口线。

AD7705引脚图（管脚图）：AD7706引脚图（管脚图）：AD7705与68HC系列单片机的C语言接口程序：/* This program has read and write routines for the 68 HC11 to interface to the AD7705 and the sample progra m sets the variousregisters and then reads 1000 samples from one chann el. */#include <math.h>#include <io6811.h>#define NUM_SAMPLES 1000 /* change the number of data samples */#define MAX_REG_LENGTH 2 /* this says that the max length of a register is 2 bytes */Writetoreg (int);Read (int,char);char *datapointer = store;char store[NUM_SAMPLES*MAX_REG_LENGTH + 30]; void main(){/* the only pin that is programmed here from the 68HC 11 is the /CS and this is why the PC2 bit of PORTC is made asan output */char a;DDRC = 0x04; /* PC2 is an output the rest of the port bits are inputs */PORTC | = 0x04; /* make the /CS line high */ Writetoreg(0x20); /* Active Channel is Ain1(+)/Ain1(-), next operation as write to the clock register */Writetoreg(0x0C); /* master clock enabled, 4.9512MHzClock, set output rate to 50Hz*/Writetoreg(0x10); /* Active Channel is Ain1(+)/Ain1(-),next operation as write to the setup register */ Writetoreg(0x40); /* gain = 1, bipolar mode, buffer off, clear FSYNC and perform a Self Calibration*/while(PORTC & 0x10); /* wait for /DRDY to go low */for(a=0;a<NUM_SAMPLES;a++);{Writetoreg(0x38); /*set the next operation for 16 bit read from the data register */Read(NUM_SAMPES,2);}}Writetoreg(int byteword);{int q;SPCR = 0x3f;SPCR = 0X7f; /* this sets the WiredOR mode(DWOM= 1), Master mode(MSTR=1), SCK idles high(CPOL=1), /S S can be lowalways (CPHA=1), lowest clock speed(slowest speed which is master clock /32 */DDRD = 0x18; /* SCK, MOSI outputs */q = SPSR;q = SPDR; /* the read of the staus register and of thedata register is needed to clear the interrupt which tells the user that thedata transfer is complete */PORTC &= 0xfb; /* /CS is low */SPDR = byteword; /* put the byte into data register */while(!(SPSR & 0x80)); /* wait for /DRDY to go low */ PORTC |= 0x4; /* /CS high */}Read(int amount, int reglength){int q;SPCR = 0x3f;SPCR = 0x7f; /* clear the interupt */DDRD = 0x10; /* MOSI output, MISO input, SCK outpu t */while(PORTC & 0x10); /* wait for /DRDY to go low */ PORTC & 0xfb ; /* /CS is low */for(b=0;b<reglength;b++){SPDR = 0;while(!(SPSR & 0x80)); /* wait until port ready before r eading */*datapointer++=SPDR; /* read SPDR into store array vi a datapointer */}PORTC|=4; /* /CS is high */}。

tl7705a原理
TL7705A是一种用于电源管理的集成电路，可以广泛应用于电子设备中。

本文将从原理的角度来介绍TL7705A的工作原理和应用。

TL7705A是一种电源管理IC，它主要用于监测和控制电源电压，并提供过电流和过温度保护。

它可以在电源电压超出设定范围时进行报警或自动断电，以保护电子设备的安全运行。

TL7705A的工作原理基于反馈控制的思想。

它通过对电源电压进行采样和比较，根据比较结果来控制输出电路。

当电源电压低于设定值时，TL7705A会通过比较器产生一个低电平信号，从而触发控制电路，使输出电路断开。

当电源电压恢复到设定值以上时，TL7705A会停止产生低电平信号，输出电路恢复正常工作。

TL7705A还具有过电流和过温度保护功能。

当电流超出设定范围或温度超过限定值时，TL7705A会发出警报信号或自动断开电路，以防止电子设备损坏或发生故障。

TL7705A的应用非常广泛。

它可以用于电源管理系统中的电压监测和控制，保证电源的稳定输出。

它还可以用于电池管理系统，监测和控制电池的电压，防止电池过放或过充。

此外，TL7705A还可以用于电源逆变器和开关电源中，提供电源保护和控制。

TL7705A是一种功能强大的电源管理IC，具有电压监测、过电流保
护和过温度保护等功能。

它的工作原理基于反馈控制，可以有效地保护电子设备的安全运行。

同时，它的应用范围广泛，可以用于各种电源管理系统和电子设备中。

通过使用TL7705A，可以提高电子设备的可靠性和稳定性。

为此， 我们选用 AD7705 作为模数转换器。AD7705
１ 闸位荷重仪的基本原理
在 闸 位 荷 重 仪 中 ，最 基 本 的 测 量 参 数 包 括 开 度 和荷重。闸位编码传感器与闸门启闭机主轴相连， 把闸门的提升高度转换为数字编码后可直接送入微 处 理 器；而 测 量 荷 重 我 们 采 用 压 力 传 感 器 。起 吊 闸 门时，传感器受力，输出电压信号。此信号经 A/D 转换后，由微处理器读入、处理并显示输出，进行 报警控制。图 1所示为闸位荷重仪的原理框图。
在我们的系统中，由于89C51的串行口用于扩展 RS-485 接口。因此，采用另一种方法，即用 89C51的 并行口模拟串行口的时序，完成对 AD7705的操作， 详细的连接方法如图 1 所示。把 89C51 的 P1.7、P1.6、
P1.5、P1.4 分别与 AD7705 的 DIN、SCLK、DOUT、CS
程增益 （具有 1、 2、 4、 8、 16、 32、 64、 128 八种
的 24 位并行输入口完全可以满足不同位数的编码
放 大 倍 数 ）、可 编 程 输 出 数 据 更 新 率 及 自 校 准 和 系
器需要 ； 另一片 8255 用作键盘显示接口。
统 校 准 功 能；同 时 具 有 三 线 串 行 接 口 ，与 微 处 理 器
AD7705 是 AD 公司新推出的 16 位 Σ - Δ A/D 转换器。器件包括由缓冲器
图１ 闸位荷重仪的原理框图
和 增 益 可 编 程 放 大 器（ PGA ）组 成 的 前 端来自拟调节电路、Σ - Δ调制器、可编
综 合 考 虑 仪 器 的 功 能 、运 行 环 境 及 经 济 效 益 等
程数字滤波器等部件。能直接将传感器测量到的 2

PACKAGING INFORMATIONOrderable Device Status(1)PackageType PackageDrawingPins PackageQtyEco Plan(2)Lead/Ball Finish MSL Peak Temp(3)5962-88685012A OBSOLETE LCCC FK20TBD Call TI Call TI TL7702ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702ACP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702AID ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7702AIP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702AIPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7702AMFKB OBSOLETE LCCC FK20TBD Call TI Call TITL7702AMJG OBSOLETE CDIP JG8TBD Call TI Call TITL7702AMJGB OBSOLETE CDIP JG8TBD Call TI Call TITL7705ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACP ACTIVE PDIP P850Pb-Free CU NIPDAU N/A for Pkg Type 31-Oct-2006Orderable Device Status(1)PackageType PackageDrawingPins PackageQtyEco Plan(2)Lead/Ball Finish MSL Peak Temp(3)(RoHS)TL7705ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7705ACPSLE OBSOLETE SO PS8TBD Call TI Call TITL7705ACPSR ACTIVE SO PS82000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705ACPSRE4ACTIVE SO PS82000Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AID ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDG4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIDRG4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7705AIP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7705AIPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7705AMFKB OBSOLETE LCCC FK20TBD Call TI Call TITL7705AMJG OBSOLETE CDIP JG8TBD Call TI Call TITL7705AMJGB OBSOLETE CDIP JG8TBD Call TI Call TITL7709ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7709ACP ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg TypeTL7709ACPE4ACTIVE PDIP P850Pb-Free(RoHS)CU NIPDAU N/A for Pkg Type TL7709AID OBSOLETE SOIC D8TBD Call TI Call TITL7709AIP OBSOLETE PDIP P8TBD Call TI Call TITL7712ACD ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDE4ACTIVE SOIC D875Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDR ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIMTL7712ACDRE4ACTIVE SOIC D82500Green(RoHS&no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7712ACP ACTIVE PDIP P850Pb-Free CU NIPDAU N/A for Pkg Type 31-Oct-2006Orderable DeviceStatus (1)Package Type Package DrawingPins Package QtyEco Plan (2)Lead/Ball FinishMSL Peak Temp (3)(RoHS)TL7712ACPE4ACTIVE PDIP P 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7712AID OBSOLETE SOIC D 8TBD Call TI Call TI TL7712AIP OBSOLETE PDIP P 8TBD Call TI Call TITL7715ACD ACTIVE SOIC D 875Green (RoHS &no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7715ACDE4ACTIVE SOIC D 875Green (RoHS &no Sb/Br)CU NIPDAU Level-1-260C-UNLIM TL7715ACP ACTIVE PDIP P 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7715ACPE4ACTIVE PDIP P 850Pb-Free (RoHS)CU NIPDAU N /A for Pkg Type TL7715AID OBSOLETE SOIC D 8TBD Call TI Call TI TL7715AIPOBSOLETEPDIPP8TBDCall TICall TI(1)The marketing status values are defined as follows:ACTIVE:Product device recommended for new designs.LIFEBUY:TI has announced that the device will be discontinued,and a lifetime-buy period is in effect.NRND:Not recommended for new designs.Device is in production to support existing customers,but TI does not recommend using this part in a new design.PREVIEW:Device has been announced but is not in production.Samples may or may not be available.OBSOLETE:TI has discontinued the production of the device.(2)Eco Plan -The planned eco-friendly classification:Pb-Free (RoHS),Pb-Free (RoHS Exempt),or Green (RoHS &no Sb/Br)-please check /productcontent for the latest availability information and additional product content details.TBD:The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS):TI's terms "Lead-Free"or "Pb-Free"mean semiconductor products that are compatible with the current RoHS requirements for all 6substances,including the requirement that lead not exceed 0.1%by weight in homogeneous materials.Where designed to be soldered at high temperatures,TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt):This component has a RoHS exemption for either 1)lead-based flip-chip solderbumps used between the die and package,or 2)lead-based die adhesive used between the die and leadframe.The component is otherwise considered Pb-Free (RoHS compatible)as defined above.Green (RoHS &no Sb/Br):TI defines "Green"to mean Pb-Free (RoHS compatible),and free of Bromine (Br)and Antimony (Sb)based flame retardants (Br or Sb do not exceed 0.1%by weight in homogeneous material)(3)MSL,Peak Temp.--The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications,and peak solder temperature.Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.TI bases its knowledge and belief on information provided by third parties,and makes no representation or warranty as to the accuracy of such information.Efforts are underway to better integrate information from third parties.TI has taken and continues to take reasonable steps to provide representative and 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