Hi,
I am working on a LPS22hh however it's not doing what I wanted it to do.
Using a pic18f8722 with SPI at rtc and two 22bit adc's working perfect.
Now adding a lps22hh
Started with temperature
Getting all strange effects like;
Idiot high temperature ''Thigh'' most of the time far to high 226.78 degree.
If you touch the SDO them goes down to a negative value.
Placing a pull-up 47K output goes to zero.


I must overlooked something but what?

Whom has the answer?

Picbuster.

                    Ena_A2=0; // select
               
                   
                     SSP2CON1bits.WCOL = 0;
           
         hhp=0x2b; // low order  temperature Byte
                      
                      
                      hhp=hhp<<1;  // shift one   see manual
                      hhp |=1<<0;  // set bit zero to enter transmit from lps22hh
                       SSP2BUF =hhp; // send it
                       while    (!SSP2STATbits.BF)  {} // wait receive
                              __delay_us(1);  
                         Tlow=  SSP2BUF; //  Get the byte
                     
              
                         int  garbage=     SSP2BUF; // collect garbage

                              SSP2CON1bits.WCOL = 0;
                              
                            hhp=0x2c; // high order temperature Byte
                      
                       
                            hhp=hhp<<1;
                            hhp |=1<<0;
                            SSP2BUF =hhp;
               
                            while    (!SSP2STATbits.BF)  {} // wait receive
                        __delay_us(1);
                           Thigh=   SSP2BUF;
               
                            Ena_A2=1; // deselect
                   
                         long h=(long)(Thigh<<8 );  // shift left
                         Grd= (float)(h+(long)(Tlow))/100;  // calculate conform manual
                   
                         printf("B  T%d    %d    %ld      %f\r\n" ,Tlow,Thigh,h,Grd);

moderators note : added code tags

 

Hi,
I am working on a LPS22hh however it's not doing what I wanted it to do.
Using a pic18f8722 with SPI at rtc and two 22bit adc's working perfect.
Now adding a lps22hh
Started with temperature
Getting all strange effects like;
Idiot high temperature ''Thigh'' most of the time far to high 226.78 degree.
If you touch the SDO them goes down to a negative value.
Placing a pull-up 47K output goes to zero.


I must overlooked something but what?

Whom has the answer?

Picbuster.

                    Ena_A2=0; // select
              
                  
                     SSP2CON1bits.WCOL = 0;
          
         hhp=0x2b; // low order  temperature Byte
                     
                     
                      hhp=hhp<<1;  // shift one   see manual
                      hhp |=1<<0;  // set bit zero to enter transmit from lps22hh
                       SSP2BUF =hhp; // send it
                       while    (!SSP2STATbits.BF)  {} // wait receive
                              __delay_us(1); 
                         Tlow=  SSP2BUF; //  Get the byte
                    
             
                         int  garbage=     SSP2BUF; // collect garbage

                              SSP2CON1bits.WCOL = 0;
                             
                            hhp=0x2c; // high order temperature Byte
                     
                      
                            hhp=hhp<<1;
                            hhp |=1<<0;
                            SSP2BUF =hhp;
              
                            while    (!SSP2STATbits.BF)  {} // wait receive
                        __delay_us(1);
                           Thigh=   SSP2BUF;
              
                            Ena_A2=1; // deselect
                  
                         long h=(long)(Thigh<<8 );  // shift left
                         Grd= (float)(h+(long)(Tlow))/100;  // calculate conform manual
                  
                         printf("B  T%d    %d    %ld      %f\r\n" ,Tlow,Thigh,h,Grd);

moderators note : added code tags

Found the problem lps22hh output SDO internal defect.
Going to replace the chip.
Picbuster