ADS1015: ADS1015 output code will sometimes change to 0XFFFF then turn back to the right value, then change to 0XFFFF.

Hi team,

My customer is using the ADS1015 now, and meet some problmes below.

ADS1015 output code will sometimes change to 0XFFFF then turn back to the right value, then change to 0XFFFF.

The schematic is below. we only  configure Conversion register C303

The code is below.

void  InitADS_task(void)

{

         s16 temp=0;

         float temp_a=0;

         while(1)

         {

// printf("-----------------------------------------------\n");

             rtems_task_wake_after(2000);

             Write_TMP_reg_word(0x01,  0x03C3); //actually "0xC303"

             rtems_task_wake_after(10);

             Read_TMP_reg(0x01);

             temp=(s16)Read_TMP_reg(0x00 );

             temp=(*((s8*)&temp)  << 8 & 0xff00)   | temp >> 8;

             temp=temp>>4;

//            printf( "temp :0x%02x   %d  \n"  , temp ,temp);

             temp_a=(temp/2048.0* 4.096);

//            printf("temp_a= %.2f \n\n" , temp_a );

             temp_VCSEL=temp_a;

//            printf("temp_a= %.2f   ,%.2f \n\n" ,

temp/2048.0,temp/2048.0*4.096 );

         }

}

From the datasheet, the chip should not generate code like 0XFFFF? Could you please help check why and give some suggestions?

Thanks.

BR

Frank