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AD7190 no constant values

Question asked by Thomas123456 on Oct 15, 2014
Latest reply on Oct 23, 2014 by Thomas123456

Hello,

 

im using the ad7190 with a reference voltage of VRef=DVDD=AVDD=5V

if i put a Voltage of 2,5V between Ain 1 and Ain 2 i get teh right value (something around 0x7FFXXX) from the Data Register

 

if i put 0,7V I sometimes get right values and sometimes ( 0x3XXXXX) from the Data Register and sometimes its about 0xFFXXX or 0x7XXXXX)

 

has anyone an idea why this happens?

 

im writing the following valuesinto teh registers of AD7190:

 

Configutation Register:    0x100108

Mode Regisrer          :     0x188801

 

the Data Register is Read every 2ms by an non maskable interrupt

 

thanks you

Thomas

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