Hi Ian, Using Zone 2 for reading 16b conversion data will require 18MHz SCLK speed using only 4 wires. If you want to read the parity bits, the clock speed will be slightly higher, ~20MHz. Hope this helps clear things up. Keith
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Forum Post: RE: ADS8920B: Replacing a Microchip MCP3550 ADC with an ADS8920B
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Forum Post: RE: ADS1204: Influence of the Input Source Impedance
Hi Nicole, Are you able to test your system with and without a buffer on the input to the ADS1204 ?
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Forum Post: ADS1299EEGFE-PDK: No output from the Dout pin of the evaluation board
Part Number: ADS1299EEGFE-PDK Greetings. I am trying to interface ADS1299EEGFE-PDK with Arduino for acquisition of EEG signals. I am using the library given in the link given below https://github.com/OpenBCI/OpenBCI-V2hardware-DEPRECATED/tree/master/Arduino/Libraries/ADS1299 I have tested the power supply as given in the datasheet of ADS1299EEGFE-PDK and they all look good. The connections are as follows SCK = 13 MISO [DOUT] = 12 MOSI [DIN] = 11 CS = 10 RESET = 9 DRDY = 8 The jumper configuration are done as per the instructions given in the datasheet. I tried debugging the SPI communication using DSO. I was able to get the MOSI, SCLK, CS signals correctly but I am not getting any output from MISO[DIN].
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Forum Post: RE: What is the ADC converter to be used with BeagleBoard-X15 to transform 0-10V into 0-1.8V?
Hi, 1. Yes, the device should be able to work with three sensors at once, if they are connected to different interface instances. 2. There is no particular recommendation for this. Basically AM5728 could work with most of the available ADCs on the market, I'd suggest looking at devices that use serial interfaces (SPI, I2C, etc.) to transfer data to the SoC. Also it would be easier for your future work to choose a device that already has a driver (depending on what OS are you going to use in your application: Linux or RTOS). Best Regards, Yordan
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Forum Post: TSW1400EVM: No firmware error
Part Number: TSW1400EVM I`m trying to connect TSW1400EVM to AFE5832EVA. I downloaded HSDC v5.0, but there is no firmware for AFE5832 in Select ADC. Also, I can`t find AFE5832 GUI program. Other model`s GUI can be downloaded in TI homepage, but AFE5832 can`t. How can I download AFE5832 GUI and AFE5832 firmware for HSDC?
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Forum Post: RE: ADS8920B: Replacing a Microchip MCP3550 ADC with an ADS8920B
Hi Keith, I see what you're saying... but when you say 4 wires, is the 4th wire connected to SDI? From the datasheet I thought enhanced SPI required the use of a different pin such as CONVST. Thanks again for your time, Ian
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Forum Post: ADS7047: Troubleshooting ADC Devices
Part Number: ADS7047 In troubleshooting the functionality of the DAC, we check on the reference voltage, the load and the digital I/O. In line with this, is such methodology applicable to ADCs too? Thank you.
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Forum Post: RE: ADS1256: Setting up the SPI Logic Analyzer for ADS1256
Hi Khoi, If you are having signal integrity issues, then it might be a good idea to try using a lower SCLK frequency rather than a higher one. Please note that running SCLK faster than FCLK/2 would be outside of the ADS1256 specifications and is not recommended. If are in SDATAC mode and use the RDATA command to fetch the data, then you must include the t6 delay after the first command byte (see figure 30 in the ADS1256 datasheet). However, if you are in RDATAC mode then you can simply clock out the data by sending 24 continuous clocks, as shown in Figure 32. I hope that helps!
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Forum Post: RE: DAC8771EVM: DAC8771EVM
Hi Kost, The default jumper positions can be found in Section 2.3 of the the EVM user's guide. The guide also explains how to operate the EVM: http://www.ti.com/lit/ug/slau727/slau727.pdf Did you connect a 12-36V power supply to PVDD/AVDD? In the EVM GUI enable the reference, set the power-off condition to High-Z, enable the buck-boost converter, select the current range, and click output enable. Then you should be able to write to the DAC data register and set the current output. Thanks, Garrett
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Forum Post: RE: ADS1299EEGFE: How to verify that the board is working correctly?
Hi Mattias, Thanks for your post! Instead of connecting electrodes first, how about trying a sine wave from a signal generator? This video series should help for electrode connections: https://training.ti.com/how-measure-ecg-introduction-what-ecg?cu=1128637
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Forum Post: RE: ADS1292ECG-FE: Source code and VI files
Hi Liliana, Thanks for your post! Accept my friend request and I'll send you the .zip.
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Forum Post: RE: ADS1299EEGFE-PDK: Hardware and software problems
Hi Matheus, Thanks for your post! Probe the power pins (AVDD,DVDD) to see if power is correctly reaching the part. If POWER SUPPLY IN and POWER SUPPLY GND are short circuited, your board may very well be damaged. To check to see if the ADS1299 is damaged, probe the VCAP voltages with respect to AVSS: VCAP1: AVSS + 1.2V VCAP2: (AVDD+AVSS)/2 VCAP3: AVDD + 1.9V If the VCAP voltages look ok, then I would recommend uninstalling all software, including the drivers, then re-install following these directions: e2e.ti.com/.../656505 Please consult the ADS1299 User's Guide for how to properly provide external power to the board.
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Forum Post: RE: ADS1296: Continuous data mode sometimes only returns 0s
Hi Fabien, Thanks for your post! What is the input signal that's being applied? Do you see the same behavior when applying DC to the input?
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Forum Post: RE: ADS1299EEGFE-PDK: No output from the Dout pin of the evaluation board
Hi Bharath, Can you verify that the master clock (CLK) is applied and the START pin is high? The POR counter only begins after both supplies have ramped and clock is applied. If START is pulled up on your board, /DRDY should begin pulsing as soon as the POR reset sequence is complete. Regards,
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Forum Post: RE: ADS1298R: Connection with only 2 unipolar electrodes
Hi Damien, Your picture did not attach correctly. Please try to upload it again. The ADS1298RECGFE-PDK assumes you are using the RLD to bias the DC-coupled inputs. Check out our training portal for some useful videos on ECG signal chain. This may be helpful to explain the different signal chain requirements. One of the sections details the difference between AC coupled and DC coupled inputs. training.ti.com/how-measure-ecg-guide-signals-system-blocks-and-solutions Best Regards,
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Forum Post: ADS1220: ADS1220: reading data without DRDY. RDATA problem
Part Number: ADS1220 Hi everyone. I am trying to communicate with ADS1220 in standard mode but without DOUT/DRDY pin. I set registers and read their values, receiving valid result. Now I am trying to read temperature and voltages. Registers looks like: #define DEFAULT_CONFIG_REG0 0b00000000 // AINP=AIN0, AINN=AIN1, Gain 1, PGA enabled #define DEFAULT_CONFIG_REG1 0b00000100 // Data rate: 20 SPS, Normal Operating mode, Continuous conversion mode, Temperature sensor disabled, Burn-out disabled #define DEFAULT_CONFIG_REG2 0b00010000 // Internal 2.048-V reference, Simultaneous 50-Hz and 60-Hz rejection, Switch always open, IDAC Off #define DEFAULT_CONFIG_REG3 0b00000000 // IDAC1 disabled, IDAC2 disabled, Only DRDY General code looks like: writeSingleRegister( 1, DEFAULT_CONFIG_REG1 & (1 << 1) ); int temp = readData(); writeSingleRegister( 1, DEFAULT_CONFIG_REG1 ); int voltage = readData(); void writeSingleRegister(uint8_t address, const uint8_t value) { // set CS and other variables ... SPI.transfer(WREG | (address<<2)); SPI.transfer(value); } int32_t readData() { // set CS and other variables ... SPI.transfer(RDATA); // read 3 bytes } Unfortunately my code receive nothing. Variables temp and voltage are all bits high. I have no possibility to test data lines with oscilloscope or LA now, but everything seems that there is some problem with such data reading.
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Forum Post: RE: ADS1298R: Connection with only 2 unipolar electrodes
(Please visit the site to view this file)Here is my schematic.
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Forum Post: RE: DAC8551: Serial interface specification of DAC8551 and DAC8560
Hi Oba, This device has no issues with a continuous SCLK. The customer must only ensure that the most significant bit on the DIN is set-up before the first falling edge of SCLK after the falling edge of SYNC. Below I have drawn 3 valid cases showing the where the falling SCLK edge can occur after the SYNC Falling Edge.
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Forum Post: RE: AMC7812: seeking support for I2C communication in AMC7812
Hi Santosh, This timing looks okay - are you adhering to the required command format for a read?
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Forum Post: RE: ADS1256: Maximum data output rate on one SE Channel
Hi Chris, thanks for your fast reply, That helps me a lot. Best regards, Felix
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