TMP 100 Evaluation board

Hi Fradaric,

The TMP100 would be an I2C slave.  It looks like you could pick off SCL and SDA from test points one and two (respective) back to your FPGA board.  The TMP100 is actually supported through our Temp Sensor forum, so I'll move your post there and perhaps get you a more complete answer/solution to your problem.

Since I am using TMP100 Evaluation board, how can I power up the device. I don't wanna coonect it to a PC via RS232.

Fradaric,

As seen in the schematic above you can hook up a separate power supply to J1 pin 1. The TMP100 can operate at a supply range from 2.7 to 5.5V. The most common voltage to power on this device is with 3.3 V.

I need continuous temperature values, so In my design I put  '1001000' after the start bit and again '0' as R/W then waited for ack an then  '000000-00(P1P0) like that. Is it the right procedure?  

Verilog code with in-out pin is difficult to check via test bench, so I need someone to verify my design.

Here is my code

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

`timescale 1ns / 1ps
// Fradaric Joseph
// Indian Institute of Technology Guwahati
// Ph: 09401015142

module I2C(
    inout sda,
    output scl,
    output [15:0] temperature_out,
    input clk
    );

parameter clock_div=500; //  I2C clock 50MHz/(500)=100KHz
//---------------------------I2C State Machine Variables----------------------
parameter Rxidle    =0;
parameter Rxstart    =1;
parameter RxPointeraddr    =2;
parameter Rxdata    =3;
parameter Rxstop    =4;
//-----------------------------------------------------------------------------
reg chk=0;
reg ack=0;
reg ack1=0;
reg ack2=0;
reg ack3=0;
//------------------------------------------------------------------------------
reg I2Cclk            =0;  // I2C clock
reg [8:0] clkclk=clock_div; // in order to divide 50MHz clock
reg sda_int            =1; // making SDA high in initial state
reg [15:0] outreg    =0;
reg [3:0] I2C_counter=0;  // for giving the pointer address (000000-00(P1P0))
reg [3:0] bitaddrs7=4'b0001; // initializing via giving slave address(1001000-0(R/W))
reg [3:0] Rxcount=0;// receiving data from TMP 100
/// ----------------------------------------------------------------------------
    reg [2:0] state     =Rxidle ; // For State machine starting
    assign sda    =sda_int; // Using SDA pin
    assign scl    =I2Cclk;// Generated Clock for I2C
    assign  temperature_out = outreg;  // output from TMP 100
////------------------------------
always @ (posedge clk) /// --------------------- scl generation-----------------
begin
    clkclk=clkclk - 1;
if(clkclk==0)
    begin
    I2Cclk=~I2Cclk;
    clkclk        =clock_div;
    end
end
////.............................................................................
always @(posedge I2Cclk)
begin
    ////....................................state machine.........................
case (state)
//-------------------------------------------------------------------------------
Rxidle:
                begin sda_int        =1'b0;    //---------------------start sda = 0
                state            =Rxstart;end
//-------------------------------------------------------------------------------                
Rxstart:
begin
        case(bitaddrs7)
        // initial frame 010010000 Initializing slave address
            1:    begin
                sda_int        =1'b1;
                bitaddrs7=bitaddrs7+1; end
                //---------------------sda 0
            2:    begin sda_int        =1'b0;
                bitaddrs7=bitaddrs7+1; end
                //---------------------sda 0
            3:    begin sda_int        =1'b0;
                bitaddrs7=bitaddrs7+1; end
                //---------------------sda 1
            4:    begin sda_int        =1'b1;
                bitaddrs7=bitaddrs7+1; end
                //---------------------sda 0
            5: begin    sda_int        =1'b0;
                bitaddrs7=bitaddrs7+1; end
                //---------------------sda 0
            6: begin    sda_int        =1'b0;
                bitaddrs7=bitaddrs7+1; end
                //---------------------sda 0
            7: begin sda_int        =1'b0;    
                bitaddrs7=bitaddrs7+1; end
                //---------------------sda=0
            8:    begin sda_int        =1'b0;
                bitaddrs7=bitaddrs7+1; end // R/W  bit
            9: begin if(sda==1'b1)
                state=RxPointeraddr;            // Checking ack high
                end
    endcase
end
//---------------------------------------------------------------------------------        
RxPointeraddr:
    // Pointer Address 000000-00(P1P0) for temperature register
begin
        case(I2C_counter)
                        //---------------------sda = 0
            0: begin    sda_int        =1'b0;
                I2C_counter=I2C_counter+1;end
                        //---------------------sda = 0
            1:    begin sda_int        =1'b0;
                I2C_counter=I2C_counter+1;end
                        //---------------------sda = 0
            2:    begin sda_int        =1'b0;
                I2C_counter=I2C_counter+1; end
                        //---------------------sda = 0
            3:    begin sda_int        =1'b0;
                I2C_counter=I2C_counter+1; end
                        //---------------------sda = 0
            4: begin    sda_int        =1'b0;
                I2C_counter=I2C_counter+1;end
                        //---------------------sda = 0
            5:    begin sda_int        =1'b0;
                I2C_counter=I2C_counter+1;end
                        //---------------------sda = 0
            6:    begin sda_int        =1'b0;
                I2C_counter=I2C_counter+1;end
                        //---------------------sda = 0
            7:    begin sda_int        =1'b0;  
                I2C_counter=I2C_counter+1;end
            8:    begin    if(sda==1'b0)
                state=Rxdata;      ack1=0;end // after pointer register sda line acknoledged by a low    pulse    
            endcase
end
//----------------------------------Receiving Temperature Data --------------------------
Rxdata:
begin
    case(Rxcount)
        0: begin outreg[15]=sda;
            Rxcount=Rxcount+1;end
        1: begin outreg[14]=sda;
            Rxcount=Rxcount+1;end
        2: begin outreg[13]=sda;
            Rxcount=Rxcount+1;end
        3: begin outreg[12]=sda;
            Rxcount=Rxcount+1;end
        4: begin outreg[11]=sda;
            Rxcount=Rxcount+1;end
        5: begin outreg[10]=sda;
            Rxcount=Rxcount+1;end
        6: begin outreg[9]=sda;
            Rxcount=Rxcount+1;end
        7: begin outreg[8]=sda;
            Rxcount=Rxcount+1;end
                                        // low pulse acknoledgment from TMP100
        
        8: begin outreg[7]=sda;
            if(!sda) ack2=1;
            Rxcount=Rxcount+1;end
        9: begin outreg[6]=sda ;
            Rxcount=Rxcount+1;end
        10: begin outreg[5]=sda ;
            Rxcount=Rxcount+1;end
        11: begin outreg[4]=sda;
            Rxcount=Rxcount+1;end
        12: begin outreg[3]=sda;
            Rxcount=Rxcount+1;end
        13: begin outreg[2]=sda;
            Rxcount=Rxcount+1;end
        14: begin outreg[1]=sda;
            Rxcount=Rxcount+1;end
        15: begin outreg[0]=sda;
                if(sda==1'b0) begin ack3=1; // checking low pulse acknoledge frm TMP 100
                    state=Rxstop; end end
        endcase
end
//-----------------------------------------------------------------------------------------
Rxstop:
begin sda_int=1'b1;end  
endcase
end
endmodule

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Fradaric,

I looked through your code and found the following error. It looks like you are checking for the TMP100 to ack high. The TMP100 will pull SDA low when it acknowledges. Try changing this and then send the pointer address when the TMP100 pulls the line low. I attached the timing diagram for convienence below. Please see the 9th bit. We can step through debugging this together after this change is made. Also I would recommend using an oscilloscope on SDA and SCL while you are debugging. It will help to see what is being sent out on the communication lines.

Yehh,   I made the changes and also I found its operating frequency is 50KHz.. Can I go further? my Timing diagram shows its fine.  Just tell me any other mistakes in my code..   

Thanks

Fradaric

Hi, I am waiting for your opinion

Fradaric

Hi, I would appreciate if you can give me a verilog interface(I2C for TMP100), if you have one. I don' t have enough time left in my project.

Yes, I found the code. But I would like to know about my design too. Can I proceed with the code I've shown you? is there anything wrong you feel, and what about configuration register settings? 

case(bitaddrs7)
        // initial frame 1001000 Initializing slave address
            1:    begin
                sda_int                =1'b1;     //---------------------sda 1
                bitaddrs7=bitaddrs7+1; end
                
            2:    begin sda_int        =1'b0;//---------------------sda 0
                bitaddrs7=bitaddrs7+1; end
                
            3:    begin sda_int        =1'b0;//---------------------sda 0
                bitaddrs7=bitaddrs7+1; end
                
            4:    begin sda_int        =1'b1;//---------------------sda 1
                bitaddrs7=bitaddrs7+1; end
                
            5: begin    sda_int        =1'b0;//---------------------sda 0
                bitaddrs7=bitaddrs7+1; end
            
            6: begin    sda_int        =1'b0;//---------------------sda 0
                bitaddrs7=bitaddrs7+1; end
                
            7: begin sda_int        =1'b0;//---------------------sda=0     
                bitaddrs7=bitaddrs7+1; end
                
            8:    begin sda_int        =1'b0;
                bitaddrs7=bitaddrs7+1; end // R/W  bit
                
            9: begin if(sda==1'b0)
                ack=1'b0;
                state=RxPointeraddr;            // Checking ack high
                end
    endcase

I think this is what you talking about! right? the cases 1 to 8 indicates the address 1001000 and the 9th case is R/W and that is zero as per the timing diagram. Then??

Please give me a reply if you don't mind!. I was in a hurry and the example you have given me is not applicable  for me since it is a slave. I hope its better go for my own design rather than editing someones code.  I put the delay you have mentioned directly in to the code like #100;  sda_int =1'b0; .

I would be grateful to you if you could give me a solution.

Thanks,

Fradaric

Let me know the values in  P1 and P0, In order to get  data output from TMP100. (I am putting '00' now)

And I am confused with adding setup time into my design.  Someone please help me..... how to include  setup time?? 

Also I would like to know the configuration register settings, Is it included In the timing diagram? I need a resolution of 12 bits, how can I do that?

P1 and P0 form the pointer.  The pointer tells which register you will read or write to.  There are four different registers in the TMP100.  The pointer will determine which of the four registers that you read or write to.  Table 2 on page 5 of the data sheet tells the value of P1 and P0 required to write or read each of the registers.  For example, if P1/P0 = 00 you will read from the Temperature register.  If P1/P0 = 01 you can read or write to the configuration register.

To change the resolution to 12 bits you need to write to the configuration register.  Table 6 shows the format of the configuration register.  Bits 5 and 6 set the resolution.  These bits both need to be high.  Of course you must write all the bits of the configuration register, so when you set the resolution you will also change other configurations.  You will need to determine what you need all the other bits in the register to be.  If you don’t want the part shut down and you don’t care about the alert status the configuration below should work.

 0110 0000 == sets resolution to 12 bits, continuous conversion

 I am available for a call tomorrow.  Email your phone number if you want to discuss this on the phone.

 Art Kay

Email: Kay_art@ti.com

Chris Featherstone,

somehow I finish coding...thanks a lot, you guys really helped me... And I   got sample TMP100NA/250 from TI, the chip seems too tiny, any specific PCB's available for that, or interconnecting slots?.

I may face problems when doing real hardware interfacing rather than test-bench, hope u will be there for me till  I read temperature from TMP100.