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ADS1234 hardware Problem



Hi,

I am trying to use ADS1234 to measure the output of a load cell.currently an avr uc is used to read data from the ADS and send it it PC. I attached the schematic and PCB.

i shorted AINP3 and AINN3 and connected to voltage Vref/2 Volt by means of Voltage divider and i am getting 0x8FFFFF to 0x7FFFFF fluctuating output  in decimal.

1)when  i connect  AINP3 - AINN3 to load cell i am getting fluctuating from 0x8FFFFF to 0x9FFFFF reading and i connected a poly 100nf differential capacitor between  AINP3 - AINN3.  So may l know the the problem with me?

The following hardware setup is used

DVDD-5V

AVDD-5V

REFP-5V

REFN-0

SPEED-0

GAIN-128

I/p Voltage=12V

Many Thanks

Shahul

WEIGH_SCALE_v1_3.pdf