Other Parts Discussed in Thread: ADS1261, , TIPD188, TPS7A94
Hi all,
Due to the chip shortage, I am not able to source any ADS1261 (let me know if you have a secret stock, I am looking for QTY10).
So I am trying the ADS1262 instead…
Hello,
I'm having trouble trying to use both the GPIO and ADC functionality.
#define GPIO_PIN 0b00011110
#define GPIO_DIR 0b00000000
#define GPIO_DAT 0b00001100
#define…
Hi Alex,
Thanks for the update.
Filtering the excitation voltage can certainly help to remove some of the high frequency noise from the sensor output. Ideally, a load cell would be excited by the same voltage as the ADC reference voltage, so that any…
Hi Manisha,
The designed resolution in the reference design is 15.6 bits or 200nV regarding 10mV full-scale output of the bridge. An ADC with higher resolution(24-bit) is usually used to account for the loss of dynamic also the effect from all other components…
Hi Sasank,
Thank you for reaching out to us.
We mention connecting it to DGND to minimize interference from signals on AGND from analog parts on the design.
You'll have to check with your design if this is necessary.
You can see our implementation…
Hi Theodore,
Can I ask what you hope to gain by chopping the excitation polarity using AC excitation? You may not get the results you are expecting relative to the effort involved. AC excitation will only remove the error and offset of the load cell.
…Hi Ilhan,
"Resolution" is a measurement's repeatability. More repeatable results generally make for better measurements; however, just because a measure is repeatable doesn't necessarily mean the result is accurate.
"Accuracy" is what…
Hi Bharat,
Welcome to the TI E2E Forums!
Unfortunately, we do not have any FPGA code examples that I'm aware of for this device. There is some Example C code for the ADS126x included in our TIPD188 Reference Design which might be helpful though.
…Hi José,
Referencing Equation 3 in the the Design Document for TIPD188, VOS2 is only removed from the measurement result if its amplitude does not change significantly between the measurements in Phase1 and Phase2. NOTE: There is a typo, equation…
Hello Christiaan,
Please provide the identification numbers of these circuits you found on ti.com. Also provide a block diagram of the product you are designing as this will be very helpful to determine what is required.
If you look through the TI, Reference…
Hi Andrew,
The minimum allowable reference voltage for the ADS1261 is 0.9V. A 9mV reference would be way out of spec and result in very poor performance.
Instead of trying to scale the input signal to the ADC's full-scale range, it is much more important…
Hi Nigel,
Welcome to the TI E2E Forums!
I think those errors are a result of some of the compiler search paths being set incorrectly in the project; all of the required files should be there... I just imported the TIPD188 firmware into CSS 8.1 and ran…
Hi Ignacio,
Welcome to the TI E2E Forums!
If you go to the ADS1262EVM-PDK product folder and look under the "Software" header, you can find the ADS126xEVM-PDK LabVIEW Source Code, which will allow you to control the ADS1262EVM in LabVIEW and…
Hi Himanshu,
Welcome to the TI E2E Forums!
There is some ADS1263 example code that was released along with the TIPD188 reference design. Please, refer to the "TIPD188 Firmware" download, under the "Software" section. I hope that helps you out!…
Hi Gianfranco,
Welcome to the TI E2E Forums!
With the provided ADCPro software, I don't know of an easy way to implement AC excitation...
The problem is that ADCPro only lets you configure the ADC registers once, and then collect a block of data for…
Thanks a lot Chris. I got your point. I will go for a design w/ ads1262 and I will also give a try with current source excitation