生物/电化学/磁场/温度传感器专区

该专区内容有关生物/电化学/磁场/温度传感器专区的讨论和常见问题解答。发帖前请阅读 Analog Devices EngineerZone 行为准则。

by Return 生物/电化学/磁场/温度传感器专区

Started 5 hours ago

13 0 1

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AD5941在初始化阶段读写寄存器正常，但采集阶段，所有寄存器读出来都是0x8080 0
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所用的的AD芯片是AD5941，电路参考的的是手册里低带宽环路电路，软件参考例程里的EDA例程。现在情况是，AD5941在初始化阶段，读写寄存器正常，包括ADID、CHIPID能正常读出，其他寄存器能正常写入与读回。但在采集阶段，不管读取任何的寄存器，读出来的数据都是0x8080，未能正常读取。日志附在附件上。

software Sensors and MEMS ad594 Temperature Sensor and Control Devices

13 0 1
by maomao190 生物/电化学/磁场/温度传感器专区

Latest 24 days ago by ADIYX
241 2 0
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3片MAX30009通过一个SPI接口并接问题读寄存器失败 0
Answered

您好，使用3片MAX30009通过一个SPI接口并接在一起，每片的CSB分别接一个独立的IO，原计划想通过CSB引脚拉低来选通其中一个来通信，发现读出的数据全部是0，请问是什么问题？是另外两片的I2C接口影响SPI通信了吗？有什么办法解决吗？谢谢 Hello, I am using three MAX30009 chips connected together via an SPI interface, with each chip's CSB pin connected to a separate...

A/D and D/A Converter Combinations Bio-Sensors

241 2 0
by kehm 生物/电化学/磁场/温度传感器专区

Latest 5 months ago by kehm

760 5 1

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4线DIA的数据问题 0
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我已经成功与ad5941建立了通信，使用了AD5940_BIA中的例程，现在将测量端子放置在50k的定值电阻上，并不能量出正确的值。附上采集数据图，绿色为频率，红色为实部，蓝色为虚部。以及原理图观察到一个现象，将s+（AIN2）放置于电阻同一侧时，产生的激励波形消失了（示波器观察）。这是正常的吗

BIA software ad5941 A/D and D/A Converter Combinations Analog Temperature Sensors ad594 Temperature Sensor and Control Devices ad5940 Show More

760 5 1
by maomao190 生物/电化学/磁场/温度传感器专区

Latest 5 months ago by ADIYX
587 2 0
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请教MAX30009阻抗计算 0
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请教关于MAX30009校准流程，手册上校准第一步是如下图，请问框出来的电阻应该怎么计算得到？按照下面的计算公式对吗？其中Iadc是I通道ADC值，Zi是文档里面说的I通道的电阻值吗？ double mag =Iadc; double current = 32E-6; //this depends on setting double p = pow(2,19)*1*(2/3.14)*(current); double ZI = mag/p; 请问有阻抗计算的参考程序吗...

Biopotential Sensors software Bio-Sensors MAX30009

587 2 0
by tongtongsakura 生物/电化学/磁场/温度传感器专区

Latest 6 months ago by ADIYX
1086 4 0
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MAX30009上位机是如何换算阻抗值？ 0
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各位好，最近我在使用max30009的评估板进行4线法阻抗测量测试时，发现参考应用手册的标定方法无法计算出有效的阻抗模值，但是上位机显示是正确的。但是，我将测试的数据导出来之后，参考手册的计算方式进行计算；使用1K的电阻进行外部校准，校准参数如下图所示计算出来的阻抗模值并不是510Ω，而是77100这样的数据，请问这是什么原因导致的？

Biopotential Sensors Bio-Sensors MAX30009

1086 4 0
by NCU 生物/电化学/磁场/温度传感器专区

Latest 6 months ago by ADIYX
813 3 0
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MAX30009 電路布局 0
Answered

我在看 MAX30009 的 EVB 版圖時，發現內層的鋪銅被移除得蠻多的。從第二層開始，基本上只有輸入端附近還有鋪銅；第三層挖得更大；到第四層幾乎只剩走線，幾乎沒有整片鋪銅，等於在多個內層挖出一大塊空區。以混合訊號或低振幅類比電路的角度來看，這樣拿掉參考平面通常會讓回流路徑變差、抗雜訊能力下降，所以有點好奇這樣設計的用意。這樣做主要是為了降低生物阻抗輸入端的寄生電容、漏電或基板耦合嗎？還是說這個 EVB 的版圖本來就是偏向量測與特性驗證，而不是量產最佳化？如果自己畫板的話...

Biopotential Sensors hardware pcb layout 鋪銅 Bio-Sensors MAX30009 Show More

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by NCU 生物/电化学/磁场/温度传感器专区

Latest 6 months ago by ADIYX
494 1 0
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MAX30009 layout 0
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I’m reviewing the MAX30009 EVB layout and noticed an aggressive copper removal strategy in the inner layers. From Layer 2 onward, copper is only kept near the input area. Layer 3 has even larger clearances, and on Layer 4 there is almost no copper pour...

Biopotential Sensors hardware A/D and D/A Converter Combinations Bio-Sensors MAX30009 Show More

494 1 0
by SWang929 生物/电化学/磁场/温度传感器专区

Latest 6 months ago by ADIYX
382 1 0
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3 導程(Lead I, Lead II, Lead III)量測 0
Answered

MAX30001可以用來做3導程(Lead I, Lead II, Lead III )量測嗎? 如果可以，需要如何設計? 或者有其他推薦元件可以用來做3導程的量測?

Biopotential Sensors hardware MAX30001 Bio-Sensors

382 1 0
by lzw 生物/电化学/磁场/温度传感器专区

Latest 7 months ago by ADIYX
438 1 0
Answered
MAX30009EVKIT测量阻抗体积描记(IPG)不稳定 0
Answered

有没有人遇到过使用MAX30009EVKIT测量阻抗体积描记(IPG)时信号不稳定？对同一个人测量，有时信号非常好，有时又噪声大到无法看出心跳波形。

Biopotential Sensors hardware MAX30009EVKIT Bio-Sensors MAX30009 Show More

438 1 0
by gimmyhuang 生物/电化学/磁场/温度传感器专区

Latest 7 months ago by JimHuang

750 4 0

Discussion
maxm86161
Discussion

我们使用MAXM86161的时候遇到了一个问题，我们的IIC总线上挂载了三个芯片，目前只有MAXM86161无法通信，IIC总线速率为100K,EN引脚测试为3.3V，芯片供电测试为3.3V，IIC总线上发送指令后设备未响应，能帮忙排查一下问题吗？

MAXM86161 software sensors Optical Sensing Technology Sensors and MEMS Show More

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AD5941在初始化阶段读写寄存器正常，但采集阶段，所有寄存器读出来都是0x8080 0
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3片MAX30009通过一个SPI接口并接问题读寄存器失败 0
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4线DIA的数据问题 0
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请教MAX30009阻抗计算 0
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MAX30009上位机是如何换算阻抗值？ 0
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MAX30009 電路布局 0
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MAX30009 layout 0
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3 導程(Lead I, Lead II, Lead III)量測 0
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MAX30009EVKIT测量阻抗体积描记(IPG)不稳定 0
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maxm86161
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3片MAX30009通过一个SPI接口并接问题读寄存器失败 0
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MAX30009 電路布局 0
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MAX30009EVKIT测量阻抗体积描记(IPG)不稳定 0
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maxm86161
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MAX30009上位机是如何换算阻抗值？ 0
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生物/电化学/磁场/温度传感器专区

Not Answered AD5941在初始化阶段读写寄存器正常，但采集阶段，所有寄存器读出来都是0x8080 0 Not Answered

Answered 3片MAX30009通过一个SPI接口并接问题读寄存器失败 0 Answered

Not Answered 4线DIA的数据问题 0 Not Answered

Not Answered 请教MAX30009阻抗计算 0 Not Answered

Answered MAX30009上位机是如何换算阻抗值？ 0 Answered

Answered MAX30009 電路布局 0 Answered

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Answered 3 導程(Lead I, Lead II, Lead III)量測 0 Answered

Answered MAX30009EVKIT测量阻抗体积描记(IPG)不稳定 0 Answered

Discussion maxm86161 Discussion

Answered 3片MAX30009通过一个SPI接口并接问题读寄存器失败 0 Answered

Answered MAX30009 電路布局 0 Answered

Answered MAX30009 layout 0 Answered

Answered 3 導程(Lead I, Lead II, Lead III)量測 0 Answered

Answered MAX30009EVKIT测量阻抗体积描记(IPG)不稳定 0 Answered

Discussion maxm86161 Discussion

Answered MAX30009上位机是如何换算阻抗值？ 0 Answered

Answered MAX31856过压/欠压故障无法解决 0 Answered

Answered AD5941与nrf52832的数据传输问题 0 Answered

Answered MAX30105停产了吗 0 Answered

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AD5941在初始化阶段读写寄存器正常，但采集阶段，所有寄存器读出来都是0x8080 0
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3片MAX30009通过一个SPI接口并接问题读寄存器失败 0
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4线DIA的数据问题 0
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请教MAX30009阻抗计算 0
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MAX30009上位机是如何换算阻抗值？ 0
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MAX30009 電路布局 0
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MAX30009 layout 0
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3 導程(Lead I, Lead II, Lead III)量測 0
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MAX30009EVKIT测量阻抗体积描记(IPG)不稳定 0
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Discussion
maxm86161
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3片MAX30009通过一个SPI接口并接问题读寄存器失败 0
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MAX30009 電路布局 0
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MAX30009 layout 0
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3 導程(Lead I, Lead II, Lead III)量測 0
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MAX30009EVKIT测量阻抗体积描记(IPG)不稳定 0
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Discussion
maxm86161
Discussion

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MAX30009上位机是如何换算阻抗值？ 0
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MAX31856过压/欠压故障无法解决 0
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AD5941与nrf52832的数据传输问题 0
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MAX30105停产了吗 0
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