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ADS1015: ADC1015 registers resets to default value in Continuous-Conversion Mode

James A
Prodigy 20 points
Part Number: ADS1015

Hai All,

I configured the ADC1015 config register to 0x4080 as shown below which had continuous conversion mode enabled. Next I continued to read the conversion register periodically , but the all the registers goes to default value ( config reg : 0x8385 ) after applying to the voltage to the analogy pin. It looks like it is performing a single conversion and entering power down state. 

    uint16_t config = ADS1015_REG_CONFIG_CQUE_1CONV   | // Comparator enabled and asserts on 1 match
            ADS1015_REG_CONFIG_CLAT_NONLAT   | // Latching mode
            ADS1015_REG_CONFIG_CPOL_ACTVLOW | // Alert/Rdy active low   (default val)
            ADS1015_REG_CONFIG_CMODE_TRAD   | // Traditional comparator (default val)
            ADS1015_REG_CONFIG_DR_1600SPS   | // 1600 samples per second (default)
            ADS1015_REG_CONFIG_MODE_CONTIN;   // Continuous conversion mode
   config |= ADS1015_REG_CONFIG_MUX_SINGLE_0;


Regards,
James A

  • 0
    TI__Mastermind 22950 points

    Hi James,

    Have you confirmed that you are correctly writing to the device in the first place? What do you read back after first writing to the device? Maybe a scope shot of the I2C lines would be helpful here as well. 

    Regards,

    Aaron Estrada

  • 0 in reply to Aaron Estrada
    Prodigy 20 points

    Hi Aaron,

    I tried setting the config register to 0x4680 and when I read it back i was getting 0x4600 , only the Data rate is not getting updated. After apply the voltage to analogy pin AIN0 , it is getting back to 0x8385

    Regards,

    James A 

  • 0 in reply to James A
    TI__Mastermind 22950 points

    Hi James,

    Can you please share a schematic and oscilloscope capture of the I2C read and write transactions? The data rate register is a 1 by default so it sounds like it is getting updated but just to a different value. Also, when you apply voltage to AIN0, are you reading 0x8385 or 0x8583? The default state of the config register is 0x8583. 

    Regards,

    Aaron Estrada