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ADS1118
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  • Forum Post: Re: ADS1118 internal voltage reference

    Bob Benjamin
    JustGreg, The ADS1118 uses a virtual reference that scales from the operating voltage. So the reason you can't find it in the datasheet is that there isn't a specific voltage used as a reference voltage. You determine the LSB size based on the input range selected for the device. Best regards...
    on Nov 3, 2011

  • Forum Post: Re: Use of the ADS1248 inputs

    Bob Benjamin
    Giuseppe, The ADS1118 has very high input impedance, so you shouldn't have a problem with your sensor. As far as using the ADS1118 as a temperature sensor, this is one of the targeted highlights of this part. The ADS1118EVM is a temperature sensor using a TC and the built in diode for CJC. You...
    on Dec 16, 2011

  • Forum Post: Re: ADS1118 Programming help

    Bob Benjamin
    Andrew, Welcome to the forum! You follow the diagrams of figure 37 or 38, depending on the mode you want to run in. Basically in either case you write to the device the same time as you read (full-duplex) and every transaction is 4 bytes. The first two bytes read (MISO) is the data result and the...
    on Jan 10, 2012

  • Forum Post: Re: ADS1118 default values?

    Bob Benjamin
    James, Welcome to the forum! Can you send us some scope shots of the communication? What are you trying to write to the ADS1118? What you are reading back is the default value plus the pull-up enabled on the DOUT pin. Best regards, Bob B
    on Jan 11, 2012

  • Forum Post: Re: ADS1118 default values?

    Bob Benjamin
    James, Is is possible for you to capture SCLK at the same time as the DIN and DOUT shots so I can see where the actual clock transitions relative to the data? Thanks, Bob B
    on Jan 11, 2012

  • Forum Post: Re: ADS1118 default values?

    Bob Benjamin
    James, It does indeed appear that the config is not getting written. I will assume that the CS going low is meeting the required timing requirements. I do notice that DIN is going tri-state. The digital input pins should not float. I'm not sure if this is the issue, but I would add a weak pull...
    on Jan 11, 2012

  • Forum Post: Re: ADS1118 default values?

    Bob Benjamin
    James, The CNV_RDY_FL should follow the operation in either mode as it is the same status used for DRDY. I'm not sure how often you are running your loop, but if the OS is set high each time you execute the loop, the device will always be converting, which may be the reason why CNV_RDY_FL is always...
    on Jan 11, 2012

  • Forum Post: Re: ADS1118 default values?

    Bob Benjamin
    James, I believe that your original understanding is correct. I would use the aforementioned method to verify that the conversion is actually starting and that at some point you know when the conversion is complete and the data is available. Think of it as stepping into the water instead of diving...
    on Jan 12, 2012

  • Forum Post: ADS 1118, shift the Config register

    Tatyana Pantina
    Hello! I am using ADS1118 with Config register: h"44EB", on the DOUT pin I see the repetition of this Config register: After accumulating some cycles of conversion, I want ADS1118 to enter a lower power standby state. So I send the config register h"45EB" (with bit MODE set...
    on Mar 13, 2012

  • Forum Post: Re: ADS 1118, shift the Config register

    Bob Benjamin
    Tatyana, Welcome to the forum! The command appears to be correct and straightforward. My concern is you seem to be sending continuous series of clocks. It is possible that the transmission became corrupt at some point. I would pause and reassert CS to make sure that the communication channel is not...
    on Mar 13, 2012

  • Forum Post: Re: How to read multiple ADS1118

    Bob Benjamin
    Kshitij, Welcome to the forum! I see a lot of repetitive code. The problem with coding this way is there can be a cut and paste errors. The basic format appears to be ok, but I cannot see how you are defining the CS for each ADS1118 device. Is it possible you have a cut and paste error for some of...
    on Mar 20, 2012

  • Forum Post: Re: ADS1118 with Type-E Thermocouple?

    Bob Benjamin
    The ADS1118 is designed for the gain scaling to be maintained throughout the supply range. However, reducing the supply voltage does reduce the input range as you cannot exceed the supply by more that 0.3V. So the short answer to your question is no. Best regards, Bob B
    on Mar 27, 2012

  • Forum Post: ADS1118 with Type-E Thermocouple?

    1985518
    If the ADS1118 PGA is set to 16x multiplication (+/- 0.256V), does that mean that for a Type-E Thermocouple with (68uV/degree C) that the resolution is inherently limited to approximately 0.25 degrees C? Here's my reasoning: If the full scale range is +/-0.256V, then the total number of possible...
    on Mar 3, 2012

  • Forum Post: Re: ADS1146

    Andres Torre
    Hi Bob Benjamin, Thank you very much for your help, I will try with AD1118, but I would like a ADC converter 16bits, no differential input which I can calibrated with its registers like ADS1146. What ADC do you recommend me? I am thinking of connecting a permanent +2.5V to AINN instead of GND...
    on Mar 30, 2012

  • Forum Post: Re: ADS1146

    Andres Torre
    Hi Bob, I think I cannot make what I posted: "I am thinking of connecting a permanent +2.5V to AINN instead of GND and the input AINP would be between 0V-5V, so I will use all of 16 bits instead of 15 bits. I would connect +5V to REFP as well. But I think that this will be too complicated...
    on Apr 2, 2012

  • Forum Post: ADS1246 vs ADS1118 for Thermocouple

    1985518
    Can the ADS1246 be used for accurate, high resolution thermocouple measurements? The data sheet mentions that the PGA can be set to 128:1 and that it has an on-board temperature sensor, but I cannot seem to find any information regarding its accuracy. I would like to read high resolution data from...
    on Apr 5, 2012

  • Forum Post: RE: ADS1118, OS - CNV-RDY bit

    Bob Benjamin
    Edwin, This is not a silicon bug....the device works as designed. The problem is strictly in regards to the datasheet. This was a cut a paste error related to a similar device, the ADS1115. If you were able to 'poll' the conversion ready flag then it would never work for DOUT/DRDY to respond...
    on Apr 24, 2012

  • Forum Post: RE: ADS1118 does not read correctly (Data read is 00FFh and configuration register value read is FFFFh)

    Bob Benjamin
    Ankit, As you are going through a communications conversion (I2C to SPI) you need to verify that the actual transmission is correct. Have you verified the timing with an oscilloscope? Can you send us scope shot of the data transmission? When you read data back, the first 16 bits will be the data from...
    on Apr 27, 2012

  • Forum Post: How to confirm that ADS1118 is showing the correct cold junction temperature?

    Ankit Kumar
    Dear Sir, Now i am able to read the temperature of cold junction temperature sensor of ADS1118. But how to be sure that the temperature shown by ADS1118 internal sensor in correct. The question is : If the ambient temperature is X degree Celsius, how much should be the temperature shown by the...
    on May 5, 2012

  • Forum Post: ADS1118, OS - CNV-RDY bit

    Edwin Baaij
    Hi, What a incomplete ADS1118 datasheet! Anyway using the ADS1118 for the first time so to begin with a single shot mode temperature read out. The readout of code snippet below is: ADS1118: 00,00,3d,93 ADS1118: 0c,24,3d,93 0C24 hex converts to 24.3 degrees celcius which is the temperature...
    on Apr 2, 2012

  • Forum Post: RE: AD1118 or AD1148

    Andres Torre
    Hello!!! I think ADS1118 is more suitable because It has Cold Junction Compensation. is that correct? thanks!!!
    on Jun 18, 2012

  • Forum Post: AD1118 or AD1148

    Andres Torre
    Hello!! I have to make 2 different temperature sensor devices. One of them is for 4 thermocouples and the other for 4 PT100s and I would like to use the same ADC if it is possible. I have found 2 AD converters (ADS1118 and ADS1148) and I am not too sure which is more suitable for my device. Could I use...
    on Jun 18, 2012

  • Forum Post: RE: ads1118 spi communication not working

    Bob Benjamin
    Peter, You need to make sure that your data in to the ADS1118 is stable on the negative going side of SCLK, as that is where the data gets latched. Review Figure 1 of the datasheet. Adjust your SPI polarity so data transitions on positive going edge of SCLK and remains stable on negative going edge...
    on Jul 9, 2012

  • Forum Post: RE: How to read multiple ADS1118

    Bob Benjamin
    Kshitij, If you are using strictly timing delays you may have some issues as the internal oscillator can vary somewhat. Another consideration is settling of the analog input. The accuracy of the measurement will be determined by any input settling that is required due to the differences in voltage...
    on Jul 18, 2012

  • Forum Post: RE: ADS1118

    Bob Benjamin
    Daniel, I will send you something as soon as I can. Best regards, Bob B
    on Oct 8, 2012
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