LTC2400 SPI interface

[mackrackit]

Most of us here use this to compile
http://store.melabs.com/prod/pbp.html
I am not familiar with oshonsoft compiler. I did not notice that you were using that earlier.

Basically you will have three pins on something like this.

DATA
CLOCK (SCK)
LATCH or Chip Select

[PUGALENTHI.P]

Most of us here use this to compile
http://store.melabs.com/prod/pbp.html
I am not familiar with oshonsoft compiler. I did not notice that you were using that earlier.

Basically you will have three pins on something like this.

DATA
CLOCK (SCK)
LATCH or Chip Select

i now understood the use of "sck" that it is used to control the serial clk (pin) of the adc,but in the oshonsoft i cant find any command to do that.it simply got spicson and spicsoff to control the "cs" pin of the adc and no more to control the spi clk.please give me a good idea to do my project.As i mentioned above
my project is to communicate the LTC2400 to a pic 16f690 and to display on a 16*2 lcd.The lcd portion working good.THANKS FOR NOW AND THANKS A LOT FOR YOUR FURTHER SUGGESTIONS.

[mackrackit]

I would give the PBP demo a try if I were you
http://melabs.com/pbpdemo.htm

[PUGALENTHI.P]

I would give the PBP demo a try if I were you
http://melabs.com/pbpdemo.htm

thanks for the compiler,but when i bought the pic kit 2 it comes with that compiler.ill try to utilize that.how to handle the timing feature on the adc-LTC2400,do you have any idea?if have then please give me a sample code to get the data from the adc in picbasic.i connected the ltc2400 in 3 wire communication mode.thanks a lot for spending your valuable time with me.

[mackrackit]

The ****IN command in PBP will handle the timing for you when the correct MODE is selected.

The best I can do at the moment because I have not used the ADC you have is to have you look at the sample I linked you to and compare that to the data sheet of your ADC.

But I have to ask... Why use the external when the 690 has an ADC built in?

[PUGALENTHI.P]

The ****IN command in PBP will handle the timing for you when the correct MODE is selected.

The best I can do at the moment because I have not used the ADC you have is to have you look at the sample I linked you to and compare that to the data sheet of your ADC.

But I have to ask... Why use the external when the 690 has an ADC built in?

i have already tried the internal adc but for now my project is to read (4-20mA)0-5v from a pressure transduser(0-100bar) and then conver it into pressure units .so i need more accuracy and i want to use 24 bit adc.thanks for your support.

[HenrikOlsson]

Hi,
I'm sure you have your reason but can you explain why you need 24bits?

I mean, 100bar across 24bits gives you a resolution of 0.000006bar. Does a transducer capable of measuring 100bar really resolve to that kind of precision?

If you already have your 4-20mA converted to 0-5V (and not 1-5V) you'd get ~0.1bar resolution with the built in 10bit ADC. You could do some oversampling to "emulate" a 12bit ADC giving you ~0.025bar resolution.

Just some ideas.

/Henrik.