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Original question:

[FAQ] ADS1261: ADS1261 Example C Code Software

ADS1261: Not able to use analog channels AIN2 and AIN3 as GPIOs

Mahesh Adsul1
Prodigy 30 points
Part Number: ADS1261

Hi,

I am trying to configure AIN2 and AIN3 as GPIOs to be used as outputs. 

Register setting are :

initRegisterMap[REG_ADDR_ID]             =     0x00;           /* NOTE: This a read-only register */
initRegisterMap[REG_ADDR_STATUS]         =     STATUS_CLEAR;    /* NOTE: This a non-default setting */
initRegisterMap[REG_ADDR_MODE0]            =     0x4C;            
initRegisterMap[REG_ADDR_MODE1]         =     0x41;    
initRegisterMap[REG_ADDR_MODE2]         =     0x30;
initRegisterMap[REG_ADDR_MODE3]         =     0x00;    
initRegisterMap[REG_ADDR_REF]             =     0x15;   

I am observing pulses on AIN2 and AIN3 instead of continuously low signal.

Can anyone help me to understand the issue.

  • 0
    TI__Mastermind 34901 points

    Hi Mahesh,

    In the MODE1 register, you are turning on the 2-wire AC excitation mode (0100 0001), which uses the AIN2 and AIN3 pins. This is probably causing the issue, since this function will send pulses at approximately the data rate to for AC excitation mode. Please turn this off (set CHOP[1:0] = 00) and see if this helps

    -Bryan