ADS8688 Problem

Rajesh,

this is hard to say. Could be a hardware issue in your setup. Or it also could be a programming issue. You placed your thread in the MSP controller forum - you are using a Freescale processor. The ADC is from TI. If there is something wrong with your controller configuration, then it might be difficult to find somebody here in the MSP forum.

Anyway...you could at least show a schematic to see if the hardware is correct.
And then you could list your register settings for the ADC. Did you read out the registers again, to see if your write access was successful?

Dennis

i have prepared the schematic as per data sheet. After writing program registers iam reading back and also getting same data what i have wrote.
Iam using clock frequency as 4 MHZ, CPOL=0, CPHA=1. All analog
channels negative pins are grounded and applying voltage at Each channel positive pins. Daisy pin connected to ground. RST pin connected to 5V, Using internal voltage reference.
After power on I have configured in followeing way
1. Sending Reset command.
2.Sending No operation command.
3.Enabling all channel for Auto Scan mode.
4.All channels power up.
5.Feature select as 0x28.
6.Ch0-Ch7 reg as 0 to 1.25 Vr.
7.Sending Auto Reset command.
8.Reading data continuously 8 times for 8 channels.
If available kindly provide sample programs or program flow charts.


negative pins are grounded a