ads1262 test

[hsynylcn]

I built the circuit from the datasheet for the ADS1262, set the START pin HIGH and CS pin LOW. If the ADS is working, I should see a square wave from the DRDY pin. If I don't see it, does this indicate that the ADS might be faulty?

[mtwieg]

Does the datasheet say that anywhere?

I'm assuming you first have to write to some configuration registers before it starts to do anything useful.

[hsynylcn]

I took this table from the datasheet. Here the default values are specified.

[Simmed]

ADS can fucntion w/o clock in ? 

[moffy]

ADS can fucntion w/o clock in ? 

Yes, if Pin 15 is GND and Pin 16 float, it uses an internal oscillator.
It looks like you have to pulse the /CS pin each time you want to read data.

[dietert1]

As far as i read the power register default value, the device will remain in reset initially. This ADC is meant to work with a MCU for control. Without MCU it's all meaningless.

Regards, Dieter

[mtwieg]

There's a lot of conditions that have to be met for the ADC to operate, including register settings and pin states.

I would start by trying to talk with the chip via serial commands. Read all the registers and check they make sense. Also check the status byte (strangely, it seems you can only read the status byte by reading out conversion data).

[hsynylcn]

Pin 13 has dual functionality as DOUT/DRDY. I perform device selection via the CS pin. When the CS pin is LOW, Pin 13 operates in DRDY (Data Ready) mode. Under this configuration, I observed Pin 13 using an oscilloscope. While CS is LOW, a noisy square wave appears on Pin 13. However, when CS is set to HIGH, the square wave disappears.