[问：xuyonglu] 在我所设计的ADuC812控制器的3个应用中，重新编程后常发生系统工作不正常的情况，常导致仿真开发系统不能进入。
请赐教，谢谢！ |
| [答：ADI_CHARLES] The AuC812/16/24 needs to provide an external reset signal from reset generator(ADM809/810) to get correct reset timing. You should try this. @[02-1-29 上午 10:43:25] |
| [问：CZHIZHI] 请问进行串行下载时要通过1K电阻将/PSEN脚接地，在下载时/psen脚应该是什么状态，高电平？还是低电平？ |
| [答：ADI_EAGLE] 在复位时,若PSEN为低,就会进入串行下载状态. 下载时可以保持PSEN 为低。 @[02-1-29 上午 10:43:36] |
[问：zhangfams] 1：串行还是并行？
2：转换时间？
3：支持68000系列吗？ |
[答：ADI_WAYNE] 1. I think you mean the program download mode, then serial download is ok for on-circuit, parallel only for factory download.
2. The fastest convertion time for ADuC812 is 200KHZ
3. Not support for 68000 @[02-1-29 上午 10:47:42] |
| [问：xuyonglu] ADI微转换器突破性的技术在光通信领域的应用有哪些？能具体说明吗？谢谢! |
| [答：ADI_EAGLE] 用于光功率控制和监测，另，加ADN2841， ADN8830， ADN8809，ADN8831 以及其它 ADN 系列均用于光通讯。 @[02-1-29 上午 10:49:38] |
| [问：ysc_hp] 当用其中的DAC作正弦激励信号（输出），同时ADC还以有效值（RMS）、峰峰值的方式对这个正弦激励信号的进行采集，请问在用这3种芯片分别组成的系统中，其可输出的正弦激励信号的最高频率分别是多少？ |
| [答：ADI_CHARLES] The excitation source is DC current. Each of them can up to 200uA. You can use the control register called Icon to control it on and off. @[02-1-29 上午 10:52:07] |
| [问：xuyonglu] 数据采集的速度和信道数量的限制？转换器的突出优点？ |
[答：ADI_WAYNE] The fastest conversion speed for ADuC812 is 200khz. You can convert 8 channels using on chip switch. This chip integrates converter (ADC, DAC), MCU, Flash and SPI/I2C/UART, and other communication on one system. Therefore it"s a system on chip for data acquisition.
Also please note it"s very suit for portable system application because of low power assumption. @[02-1-29 上午 10:57:31] |
[问：janeslee] ADI在光通信中有无大功率（200mW以上)连续功率输出的LD驱动芯片？有无自动功率控制（APC)？
|
| [答：ADI_CHARLES] Please contact our local sales office for more details @755-378-1959. @[02-1-29 上午 10:59:43] |
| [问：panjian] 在讲座中引用的例子均为低功耗便携式仪器，请问在工业控制中microconverter有什么特点。 |
| [答：ADI_CHARLES] The Microconverter is industrial grade and integrate the serial functions like SPI/I2C and standard UART inside the chip.. @[02-1-29 上午 11:04:07] |
| [问：wjpw32] 在ADμC812芯片进入在线调试或下载状态之后，PSEN引脚是否仍应通过1kΩ电阻接地？有这个必要吗？谢谢！ |
| [答：ADI_CHARLES] It"s necessary to use 1K resistor on the chip. @[02-1-29 上午 11:05:23] |
[问：吴阿华] 1.请问ADu812是否集成了反混及重构滤波器?
2.是否内置AGC?
提问的背景是如果合适我想把它用到语音信号处理上,谢谢. |
[答：ADI_WAYNE] 1. ADuC812 has not that filter, but you can try ADuC824
2. No AGC as well @[02-1-29 上午 11:05:57] |
| [问：wjpw32] 与其它单片机相比较，在并行I/O端口的使用是有什么不同吗？ |
| [答：ADI_WAYNE] the port 1 has only digital in or analog in. No digital out for port 1 (except p1.1 and p1.0). The other port same as MCU, but with other functions. @[02-1-29 上午 11:08:01] |
| [问：wjpw31] ADμC812是贵公司最新推出的全集成12位数据采集系统，它和同类产品比较有什么特点？ |
[答：ADI_EAGLE] ADuC812 有8052MCU，8Kflasn闪存，另加8通道12Bit A/D 和2个D/A, 是一个真正的单片数据采集处理器。
Of couse, we have other SOC chip such as DSP + Audio converter/ Audio D/A --- AD73422/ AD73522. @[02-1-29 上午 11:08:44] |
| [问：CZHIZHI] 用自制的编程板对ADUC812编程时，使用download.exe下载不能成功。用示波器测量TXD、RXD时，计算机发过来的有信号，但是ADUC812无响应（是在/PSEN 接地后再上电的情况下）。问题可能出在哪里？ |
| [答：ADI_EAGLE] Do you use ADM202E to convert to RS232? 如果没有，电平不对。 @[02-1-29 上午 11:11:06] |
| [问：frankxu] 我想应用ADUC812中转换的DMA功能，设计外部硬件时应注意些什么谢谢！ |
| [答：ADI_CHARLES] The DMA requrement is need external components and RAM. You just need to set one bit inside the ADCCON2 register. There is an exanmple on the ADI web that you can reference to the design. @[02-1-29 上午 11:11:40] |
| [问：吴阿华] 能否提供详细资料？ |
| [答：ADI_CHARLES] Please contact our sales office@755-378-1959. @[02-1-29 上午 11:12:36] |
[问：wjpw32] 我能把一个高阻抗模拟信号源直接接到ADmC812的输入端吗？是否必须先把信号缓冲？
|
| [答：ADI_CHARLES] Yes, you need the buffer in the front. @[02-1-29 上午 11:14:10] |
| [问：高可A] 请问：1。片内的温度传感器的作用是什么？是对ADC变换精度的补偿吗？2。ADI公司有没有8BIT这样更便宜的产品？3。ADUC812有两个DAC输出，能否进行同步或异步工作？ |
[答：ADI_EAGLE] 1. It"s for temperature monitor, IE, to cool down the box.
2. No 8 bit microconverter. But we have a cheap one, ADuC814, it "s cheap than ADuC812. It"s also 12 bit A/D, but with only 28 Pins(Means less general I/O).
3. 可同步同时输出。 @[02-1-29 上午 11:14:29] |
| [问：Luke] 请问ADI公司目前就高速测量信号采集（如光的偏振态）的控制和接口电路有何较好的解决方案？ |
| [答：ADI_CHARLES] Please contact our local office. @[02-1-29 上午 11:14:58] |
| [问：zhang] ADuC812片内有两个DAC，8路ADC，它们之间的串扰（CROSSTALK）性能如何？ |
| [答：ADI_WAYNE] No special spec, but it"s less than 12th bit for ADuC812. @[02-1-29 上午 11:15:28] |
| [问：wjpw32] 我需要在下载程序后脱机运行，为什么有时我的ADμC812一直保持在线调试状态？请问是什么原因？ |
| [答：ADI_EAGLE] You much pull PSEN high while power on or reset. At the same time, a Reset chip ADM810 should be used. @[02-1-29 上午 11:16:31] |
| [问：panjian] 在掉电模式下，复位后的初始化是否和普通8051周期、功耗相近？ |
| [答：ADI_WAYNE] If you mean MCU, then it"s right. @[02-1-29 上午 11:17:18] |
| [问：wjpw32] 我需要为ADmC812提供一个外部复位电路吗？谢谢 |
| [答：ADI_CHARLES] Yes, You can use ADM809/810 as the reset chip. But for in the next generation chip, like ADuC814/31/34 all have the on-chip reset circuits. @[02-1-29 上午 11:18:13] |
[问：高可A] 再请问：
1。ADUC812的片内基准电压为2。5V，是否对3V和5V工作电压都一样？
2。ADC中的噪音如何降低到最低限度？是用软件还是硬件？ |
[答：ADI_EAGLE] 1. Yes.
2. You can use a RC filter to cutdown band width first. And then, you can do digital filter and then decimate down to a lower sample rate to get process gain. @[02-1-29 上午 11:19:37] |
| [问：richxu263] 他对嵌入系统和普通的工控机的应用有好处吗？他的应用方向是哪个方面，是电压的转换吗？ |
| [答：ADI_WAYNE] Yes, it"s just a kind of embedded system. It"s can be used for voltage to digital conversion, but not only. You can use it for other application including RTD, strain gauge, and so on. Meanwhile, as it integrate DAC on chip, you can also do some ocntrol function. @[02-1-29 上午 11:21:37] |
| [问：janeslee] ADuC812中的ADC calibration register是否需要用户写入？如何得到应该写入的校准数据？ |
| [答：ADI_WAYNE] No need for user to write it, as ADuC812 have power on configuration program, before running user code. The cablibration coefficient is factory loaded. Therefore unless you"ve special request, then you can do user calibration that refer to the code example, which you can down from ADI website or find it in Quickstart kit. The cabliration coefficient can be got, please follow datasheet. @[02-1-29 上午 11:27:31] |
| [问：qin] AVDD，DVDD是否可以是不同的电压？比如AVDD=5V，DVDD=3V |
| [答：ADI_CHARLES] For the ADuC812/14 have to use the same supply voltage but the ADuC816/24 can be seperate the power supply. @[02-1-29 上午 11:27:46] |
| [问：wjpw32] ADmC812能使用外部电压基准源吗？ |
| [答：ADI_CHARLES] Yes, For the high precision application. @[02-1-29 上午 11:28:58] |
| [问：zhang] DAC的驱动能力有多大？能直接驱动LED或者LCD吗？ |
| [答：ADI_CHARLES] The maximum driver load is 10K@ 2.5V. You can not direct drive LED. @[02-1-29 上午 11:36:13] |
[问：wangmeng] ADuC812中没有低通滤波器和功率增益调试功能，请问如何外接这两种功能？能否给出明确的要求，比如接口阻抗和电平，滤波器的带宽，带外衰减度等？
|
| [答：ADI_WAYNE] Normally, no filter is needed for ADuC812 output, as its work frequency is not so high. If you"ve specail consideration, please contact ADI local office for further help. @[02-1-29 上午 11:37:08] |
| [问：jiajie2008] 我局正在进行局域网升级改造工作，贵公司能提供什么方案？ |
| [答：ADI_CHARLES] Please contact our local sales office for more details. @[02-1-29 上午 11:37:25] |
| [问：hodondon] 在使用ADUC812时，电路设计应注意哪些问题？因为我们在使用过程中，发现 有时ADUC812和模拟电路互相干扰，AD采集管脚有较大的脉冲干扰，还有FLASH中 的数据不稳定，甚至发生ADUC812工作不正常现象，如无法下载代码，或在运行情 况下也可以下载程序代码。 |
[答：ADI_EAGLE] Good question. First, you should pay attention to the EMC/EMI design while SCH and PCB design.
1。模拟电源与数字电源分开使用， 或用磁珠/电感加电容组成滤波电路防止电源串扰。每个芯片电源脚都加0.1uF退耦电容。
2。注意布局。模拟信号与数字信号分开/分区， 不要缠绕。
3。接地非常重要。用4层板，一层全做地较好。
4。加复位电路ADM810.
5。输入输出隔离。与外界数字信号可用光耦隔离。
6。 A/D 输入加滤波器。 @[02-1-29 上午 11:38:25] |
| [问：hqatom] 请问，ADUC812在ADC采样时，采样频率可否随信号周期频率变化而适应变化？ |
| [答：ADI_EAGLE] No. @[02-1-29 上午 11:39:43] |
| [问：Luke] ADuc824能否用于光电检测、对外围辅助电路有何具体要求 |
| [答：ADI_CHARLES] Yes, you just need an externakl TIA or LOG amplifier. @[02-1-29 上午 11:41:51] |
| [问：Luke] 能否介绍一下有关在光电转换和信号接受、监测方面的有关应用 |
| [答：ADI_EAGLE] If you have optical products such as EDFA or transpond design in your hands. It is better to use ADuC812 to design the control circuit in your system. @[02-1-29 上午 11:42:45] |
| [问：panjian] 微转换器的抗干扰性能如何？ |
| [答：ADI_WAYNE] As ADuC integrate MCU, A/D, D/A, Flash on one chip, optimised connection between different parts is realized in factory. Therefore it can bring convenience to user, and with good performance for interference rejection. Also the digital and analog power supply is seperated, therefore it"s also good for interference rejection. @[02-1-29 上午 11:43:31] |
| [问：ysc_hp] 这三种芯片的程序反解密方法有什么特别的地方？保密（加密）能力或效果如何 ？ |
| [答：ADI_EAGLE] 加密后,You can not read out the program. When you earse, you mush earse all. @[02-1-29 上午 11:44:59] |
| [问：老娃娃] ADmC812有两个DAC, 我如何使两个DAC的输出电压同步更新？ |
| [答：ADI_EAGLE] The 2 D/A is seperated, so every point of D/A output is at the same time. @[02-1-29 上午 11:46:18] |
| [问：lixiufang] 请问芯片是否具有USB接口？ |
| [答：ADI_CHARLES] No. You have to use the paralle interface to external USB controller. This is the cheapest way. @[02-1-29 上午 11:46:26] |
| [问：hqatom] 请问，在线调试时，为什么总是只能收到低8位和高8位的数据，中间的数据总是不能接收？ |
| [答：ADI_EAGLE] I am not sure what you mean. Do you mean serial conmunication with Frame? Please contact us later. @[02-1-29 上午 11:48:33] |
| [问：dengwm] 当ADuC812用在工业控制系统，DAC的输出端如何和控制中心相连？控制的距离有多远？ |
| [答：ADI_WAYNE] You can connect them directly, but depend on its load, it"s same story for distance. You may need buffer to drive other circuits. @[02-1-29 上午 11:48:48] |
| [问：bbas] ADuC812的故障报警功能是否对有些程序有冲突，编程时是否应该注意？ |
| [答：ADI_EAGLE] You can read the register by your program. If you use watch dog, you must re-write it every a short time period. @[02-1-29 上午 11:50:35] |
| [问：liang zengfang] 我想知道怎样使用aduc812的温度传感器,能不能给我一些这样的例子? |
| [答：ADI_CHARLES] So far, we don"t have the example code. But you can read the voltage versus temperature via the ADC. If you have any questions on this, please contact our local sales office. @[02-1-29 上午 11:51:19] |
| [问：ecnanjing] 请问MicroConverter是否会有支持接口的产品 |
| [答：ADI_WAYNE] At present ADuC serials support SPI, I2C, UART. @[02-1-29 上午 11:51:43] |
| [问：janeslee] 我要利用ADuC812的2.5V基准，但是在上电暂态时，ADC输入为负电压（基准还未建立导致），结果ADuC812的基准消失，怎么解决？ |
| [答：ADI_EAGLE] You should use reset chip such as ADM810. It will release 30ms later after power on. @[02-1-29 上午 11:54:22] |
[问：relatedme] 通常我在单片机系统中，要扩展输入，输出端口。这时我可以用加译码器等方法实现。假如我要扩展256位的输出，请问在ADI微转换器系统中时如何实现的？是否有类似PLC的扩展槽或扩展机架？
谢谢！ |
[答：ADI_EAGLE] Same as 8051. But our ADuC812/816/824 can support 16MB address space, please pay attention to time sequence.
@[02-1-29 上午 11:57:12] |
| [问：wjpw32] 我要用ADmC812的内部电压基准源，我应如何使用VREF和CREF 引脚？ |
| [答：ADI_CHARLES] You just need to decoupling those two pins with 0.1uF respectively is O.K. @[02-1-29 上午 11:58:19] |
| [问：老娃娃] ：我怎样使ADmC812的内部电压基准源有效和无效？内部电压基准源有效后，基准电压稳定时间有多长？ |
| [答：ADI_WAYNE] When you enable ADC or DAC (via relative SFR), the internal reference will automatically be enabled. It will require 65ms to settle after it"s enabled. @[02-1-29 下午 12:01:20] |
| [问：janeslee] 相对cygnal公司的C8051Fxxx系列产品的优良特性（比如JTAG调试端口、20MIPS51内核、2UART等)，ADI在产品研发上有哪些应对措施？ |
[答：ADI_EAGLE] We have very good A/D and D/A inside the chip, very suitablel for control and monitor. And we will provide 62k Flash in ADuC831/832/834( The UART is enhanced in this chips). And we will cut down instruction cycle from 12 to 2 in the future. And we may develop chip base on 16 bit ARM Core based chip later.
@[02-1-29 下午 12:03:06] |
| [问：CZHIZHI] ADUC812片内温度传感器的精度如何？ |
| [答：ADI_CHARLES] -3.0mV/degree C. @[02-1-29 下午 12:03:08] |
| [问：hqatom] 在测量微小信号时（指信号强度与ADUC81X噪音强度相似或更小），有什么方法可以解决？ADUC81X内部有运放吗？是否将噪音同等放大？ |
| [答：ADI_EAGLE] There is PGA in ADuC816 and ADuC824, it will not ampify noise. you can use AD621/623/629/8551 ... to amplifier signal before ADuC812. @[02-1-29 下午 12:05:35] |
[问：wangmeng] 产品中的模拟地和数字地在PCB排版时能否合而为一？
DAC的输出有没有三态逻辑功能？或者说有没有高阻抗输出? |
| [答：ADI_WAYNE] You"d better put ADuC in single ground. Yes DAC has tri-state output. @[02-1-29 下午 12:06:03] |
| [问：ZTB] 为什么先生多次提到要使用ADM810？它与片内的WDT和复位系统各自如何分工？ |
[答：ADI_EAGLE] Watch Dog is supervisor the CUP is working or not.
ADM810 is very useful for avoid problems caused by power on.
No ADM810 need when use ADuC814/831/834. @[02-1-29 下午 12:07:56] |
| [问：qin] 我的PCB上有一些速度很高的逻辑电路，如何连接到微转换器而不影响它的模拟性能？ |
| [答：ADI_WAYNE] If your logic signal edge is very fast, then you"d better use series resister around 200ohm to slow the edge, thus it will not influence analog part performance. @[02-1-29 下午 12:09:34] |
| [问：tang123] 为了使ADC工作在最佳状态，需要经常进行校准，请问周期是多少？如何进行？在什么情况下特别需要校准？有没有进行自动校准的软件？ |
| [答：ADI_EAGLE] It according to you need. It very useful to caliberate for very high resolution AD in ADuC824, it can remove temperature drift. ADuC824 can performance auto caliberation if you set SFR. @[02-1-29 下午 12:10:56] |
| [问：CZHIZHI] 我的ADUC812的A/D转换会出现一路正常，另外的路转换数据不正常，会是什么原因引起的？谢谢！ |
| [答：ADI_WAYNE] it can be some reason, from switch to writing to memory. Please give you local ADI office the detailed schematic and code for analysis. @[02-1-29 下午 12:12:55] |
| [问：panjian] 我的项目应用环境干扰特别大，请问微转换器的抗干扰性能如何？是否适合工业环境。 |
| [答：ADI_WAYNE] ADuC series products integrate MCU, Flash, DAC/ADC and other ports in single chip. Therefore it has good interference rejection. It"s used broadly for industry control. However, if your using enviroment is very very hard, then you need to verify with the datasheet specification. @[02-1-29 下午 12:16:41] |
[问：wangmeng] 1.ADuC812能外接存储器吗？容量有多大？接口有特殊的要求吗？
2.ADuC812的输入阻抗有多高？可以直接接到高阻抗的模拟信号源？
|
[答：ADI_EAGLE] 1. You can extent to 16M. It"s easy to extent following the datasheet.
2. The input leakage current is about 10uA. If you source impendent is very high, you can use a JFET input AMP such as AD711/AD8510/AD8610. @[02-1-29 下午 12:17:08] |
[问：wjpw32] 有关ADmC812“自校准” 功能的一些特点, 我如何使用这些功能？它能校准ADmC812的ADC失调误差和增益误差吗？
|
| [答：ADI_CHARLES] There is a tech note on our web to talking about this. The Tech note number UC005. Please check it out on our web. @[02-1-29 下午 12:18:27] |
| [问：zhang] DAC如果要接平滑滤波器，请问有何要求：直接或间接，阻抗匹配等？ |
| [答：ADI_WAYNE] Normally you need not use filter after DAC as its work frequency is low. But you really need it, no special request. (please contact your local ADI office for further support) @[02-1-29 下午 12:19:40] |
| [问：liang zengfang] 在设计中,aduc812的ad输入是小信号(<50mv)或信号接近5v时,adc的转换不是很稳定,请问,如何避免?在布pcb板,有哪些方面需要注意? |
[答：ADI_EAGLE] It will be affect by noise and the rail limit. Use a match resister net to attentuate down is a way. you can restore by software.
Please refer to the previous answer about PCB layout or cantact us directly. @[02-1-29 下午 12:20:54] |
| [问：ljmfree] 他对嵌入系统和普通的工控机的应用有好处吗？ |
| [答：ADI_EAGLE] ADuC812/14/16/24 is very suitable for embed system and hand hold measure system. It can be used as the smart sensor part of the industry computer via serial port. @[02-1-29 下午 12:23:32] |
| [问：无心插柳123] 我怎样计算在给定条件下ADmC812消耗的总功率？ |
| [答：ADI_WAYNE] You should add MCU core power assumption, add ADC, add DAC, and voltage reference assumption. It should be calculated under your certain situation: such as different power supply (3v or 5v), different work mode (normal or idel), and so on. The rough working current of these parts can be found on the datasheet. @[02-1-29 下午 12:24:59] |
| [问：tang123] ADuC824中有主ADC（24BIT）和辅ADC（16BIT），它们使用上有何差别？ |
| [答：ADI_EAGLE] The 24 bit A/D has a PGA but 16 bit A/D has none. You can set different input ways (unipoler or bipoler) and different input voltage range for the main A/D. @[02-1-29 下午 12:26:18] |
[问：liu_double] What programming language does ADuC812 support?
Is it compatible with the standard 51 MCU? |
[答：ADI_WAYNE] It support C program, assembler, PL/M.
Yes it"s compatible with standard 51 MCU. @[02-1-29 下午 12:26:43] |
| [问：无心插柳123] 有人告诉我ADmC812有加密位来限制对Flash/EE程序存储器和数据存储器的访问。为什么我在ADmC812数据手册中找不到关于该特征的任何介绍？ |
| [答：ADI_CHARLES] The ADuC812 does not support the security bit. But for other chips, we support 3 levels security. All of these are on the daat sheet. @[02-1-29 下午 12:28:23] |
[问：无心插柳123] 在ADmC812中，P1口主要用于模拟输入，我能把P1口的引脚用作数字输入/输出吗？
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| [答：ADI_WAYNE] it can only be used as input (analog or digital). @[02-1-29 下午 12:31:03] |
[问：aqqatan] ad的微处理器可重复写多少次？编程器是专门的吗？如不是，目前有哪几个品牌获许可举行编程？
我曾经用过ad的ad7705，是双通道的，可是芯片内部两路好像不完全隔离，读数总有问题，是何缘故？
|
[答：ADI_EAGLE] 100K cycles endurance Flash/EE , 100 years ratantion.
你可以通过串口编程，不过只要有下载程序，下载线自制也可。所有第三方8051编译器都可用。
使用问题，在两通道输入时就要考虑通道隔离。 @[02-1-29 下午 12:32:36] |
| [问：wangxiu] 微转换器中的FLASH有没有安全密码以防止误操作而丢失数据？如何操作？ |
| [答：ADI_EAGLE] 有保密位防止别人读程序， Flash 数据掉电后也不会丢。但编程错误导致数据丢失无法避免。 @[02-1-29 下午 12:35:04] |
| [问：无心插柳123] 如果ADmC812在还没有完成一次转换的期间，接收到第二个CONVST触发信号（软件SCONV，定时器2触发，或硬件CONVST触发），会产生什么结果？ |
| [答：ADI_EAGLE] 数据回丢失. @[02-1-29 下午 12:36:36] |
| [问：无心插柳123] 在硬件CONVST模式下，ADmC812的孔径延迟是什么？孔径误差我能预知吗？ |
| [答：ADI_EAGLE] Determind by your clock system. Could you contact us later? @[02-1-29 下午 12:38:10] |
