Precision Data Converters

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ADS1115
Related Posts

  • Forum Post: Re: problem I2C with ADS1114/15

    Joseph Wu
    At this point, I see a couple of things to check: First check to see that the SDA line for each bit is correct for both the rising edge and falling edge of the SCL line. In the scope photos shown, it looks as if the falling edge of SDA happens at the same time as the falling edge of SCL. In the datasheet...
    on Feb 22, 2010

  • Forum Post: Re: ADS1115 not getting stable output at low rabge input below 0.7V and not working for PGA<1.048

    Bob Benjamin
    Monish, You should be able to achieve great results at voltages below 0.7V. Have you verified that your op amp is able to achieve those low level voltages with stability? Have you tried to connect the voltage directly to the inputs of the ADS1115 without using the op amp? If you can post your schematic...
    on Mar 4, 2011

  • Forum Post: Re: ADS1115 not getting stable output at low rabge input below 0.7V and not working for PGA<1.048

    Bob Benjamin
    Monish, Please post your schematic.....and if possible your board layout. In the earlier post you mention isolation. How is this being done? If you say you have the proper output of the op amp, then this should be converted properly by the ADS1115. This assumes that you have a common ground, however...
    on Mar 7, 2011

  • Forum Post: Re: request for ESD level of ADS1115

    Bob Benjamin
    Jim, For the ADS1115, ESD compliance at 2kV HBM, and 500V CDM. Best regards, Bob B
    on Mar 15, 2011

  • Forum Post: Re: ADS1115 channels switching setup time

    Bob Benjamin
    Maurizio, There are two modes of operation. One-shot mode, and continuous conversion mode. In both cases there is always valid data. In the one shot case, the next conversion after the mux change will be the expected result for the new mux setting. This is the easy case. It differs with the continuous...
    on Mar 29, 2011

  • Forum Post: ADS1115 channels switching setup time

    Maurizio6434
    Does anybody know what happens when the converter switches among the muxed inputs? Is there any additional time to wait for the internal filter update?
    on Mar 28, 2011

  • Forum Post: Re: ADS1115 Data read problem

    Bob Benjamin
    Craig, When you first start up the ADS1115, the conversion register is zero and remains zero until a conversion replaces it with a result. So you probably have not really started continuous conversion mode. A couple of things. To start with, you need to make sure that you have set the register...
    on Mar 31, 2011

  • Forum Post: Re: ADS1115 Data read problem

    Craig Nickerson
    Hi, I am having a lot of trouble with this chip......for starters when I read the result register I get back 0x00 0x00 I am not sure why this has NO CONVERSION data???? I also am confused how this chip knows when to convert.....I tried setting the first config register to continuous and sometimes...
    on Mar 31, 2011

  • Forum Post: ADS1015 I2C speed requirements

    Erik Oosterom
    Dear All, In the datasheet of the ADS1015 is stated that the minimum required speed is 10 kHz. The official I2C documentation from NXP states a minimum speed of 0 kHz. I have tried to drive the chip at about 500 Hz and that still seems to work fine. My questions are: 1) Why is there a...
    on Apr 29, 2011

  • Forum Post: Re: ADS1115 Conversion issues

    Bob Benjamin
    Ryan, Welcome to the forums! The inputs generally measure a differential voltage, so you can get a +/- reading over the full-scale range (binary two's complement.) So one code (LSB) is 4.096V/PGA/2^15 volts (see Table 4 in the datasheet.) So if you multiply the number of codes (returned result...
    on Aug 10, 2011

  • Forum Post: ADS1115 Conversion Delay Times

    David Escandon
    Let me try to explain my problem by describing what I am doing. I have configured the ADS1115 to 860SPS (~1.2ms samples) and single shot mode. Then I have done the following sequence: - Write config to select AIN0 - wait 2ms - Read AIN 0 data - Write config to select AIN1...
    on Nov 1, 2011

  • Forum Post: Re: ADS1115 Conversion Delay Times

    Bob Benjamin
    David, Maybe it was a typo, but you need to wait between writing config to select AIN1 data and reading of the data. If you read directly after the config write you may have read the results from the previous conversion. So you have to wait the total length of the communication plus the conversion...
    on Nov 1, 2011

  • Forum Post: Re: ADS1115 Data read problem

    Bob Benjamin
    Andy, Welcome to the forum! The process is very similar to the reading/writing the configuration register except you set the pointer register to '0' instead of '1'. Remember that you need to add the R/W bit on the address. In the case of the reading of the results: Address='10010001'...
    on Nov 2, 2011

  • Forum Post: Re: ADS1115 Data read problem

    Bob Benjamin
    Andy, Yes, there is an ACK after each byte transfer. See figures 30 and 31 in the datasheet. Best regards, Bob B
    on Nov 2, 2011

  • Forum Post: Re: ADS1115 always response 0xFF

    Bob Benjamin
    Jose, I will add one more thing to Luis' comments. I suspect that your code is giving a STOP condition after each I2C write. If you capture the transaction on a o-scope you can see not only if there is an ACK, but if the transaction stops due to a STOP communication condition. In many applications...
    on Nov 10, 2011

  • Forum Post: Re: ADS1115 always response 0xFF

    Jose Juan Diaz Gopar
    Hi, Thank you for the response. This is a capure for the configuration prior to capture data. This is the capture for data response.
    on Nov 11, 2011

  • Forum Post: Re: ADS1115 always response 0xFF

    Bob Benjamin
    Jose, It looks like you have a couple of problems. Notice in the first plot that you never set the pin high to actually start the conversion (3rd byte first character). The second pointer register change is getting a NACK because the proper stop and start are not being given. The proper start condition...
    on Nov 11, 2011

  • Forum Post: Re: ADS1115 always response 0xFF

    Jose Juan Diaz Gopar
    Bob, You are rigth, I have modified the code adding start and stop staments, and its works. i2c_start(); i2c_write(AD_ADDRESS | AD_MODE_WRITE ); i2c_write(AD_CONF_REG); // Pointer Register -> Configuration i2c_stop(); //Added i2c_start(); //Added i2c_write(AD_A0_SINGLE | AD_PGA_4096...
    on Nov 11, 2011

  • Forum Post: ADS1115 always response 0xFF

    Jose Juan Diaz Gopar
    Good Morning, I tried to connect a ads1115 to a PIC, and I always get the same answer 0xFF. The power is 3V, the pullup resistor are 10K, I had tried several ads1115. This is part of the code: i2c_start(); i2c_write(AD_ADDRESS | AD_MODE_WRITE ); //Address y modo escritura i2c_write...
    on Nov 10, 2011

  • Forum Post: Re: ads1112 single ended conversion

    Bob Benjamin
    Sarfraz, Welcome to the forum! The largest voltage that you can measure is 2.048V. The absolute input voltage that can be applied is VDD+0.2V. For example if VDD is 5V you can place more than 2.048V on the input, but and value returned will be a full scale reading. The ADS1115 is a similar device...
    on Dec 14, 2011

  • Forum Post: Re: ADS1115 Conversion issues

    Bob Benjamin
    Richard, The normal input range of the device is GND to VDD. The absolute maximum input range is 0.3V below GND to 0.3V above ground. The device will measure signals above and below the supply rails, as long as the absolute maximums are not exceeded. Best regards, Bob B
    on Dec 22, 2011

  • Forum Post: ads1114 help

    David Anderson
    Hello, I am very new to using a data converter. I have a amplified and filtered EEG signal and the end goal is to get the signal to a computer for analysis. I am considering trying to use a data converter. What options are there to send the output of the ads1114 to a computer? Is a microcontroller required...
    on Jan 23, 2012

  • Forum Post: Re: ADS1115 and ADCPro

    Michael Peffers
    Hi Kikuo, If you follow the link: http://www.ti.com/tool/adcpro you will find a document called ADCPro Hardware and Software Installation Manual (Rev. A) under Key Documents . Please refer to section 2-ADCPro Application Installation (Page 4) and follow the steps outlined in this document. You...
    on Apr 16, 2012

  • Forum Post: ADS1112 and ADS1115 - conversion time/I2C R/W delay

    Alan Yeo
    Together with a DAC, I am using the ADS1112 in a fast closed measurement loop. I need to read from only 1 channel (Ain0) as fast as possible. What is the minimum delay I should set between I2C write to start conversion and I2C read ? The datasheet states 15samples/s in 16 bit ...is the conversion time...
    on Jul 24, 2012

  • Forum Post: ADS1115 - GND and VDD are analog or digital?

    Andre Araujo
    Hello there, I'm evaluating the possibility of using ADS1115 16-bit ADC in my new design. I searched in the datasheet but didn’t find any specification whether to connect GND and VDD pins to analog or digital power circuits. Normally ADCs have separated AGND and DGND pins, but it’s...
    on Sep 17, 2012
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