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ADS1293: LEAD-OFF detection without RLD

Part Number: ADS1293

Hi TI,

we are using the ADS1293 without an RLD and want to use a Lead-off detection. I read this post in your forum and will try this ways.

https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/1245713/ads1293-dc-open-lead-detection-without-rld

A tried to use the RLD internal to IN1 and Lead-off detection seem to work, but I have 50 Hz noise in the other two channels where RLD is not involved.

Any idea what to do to avoid the noise?

{0x01, 0x0A},
{0x02, 0x1A},
{0x03, 0x19},
{0x04, 0x0A},
{0x05, 0x00},

{0x06, 0x00},
{0x07, 0x07},
{0x08, 0x01},
{0x09, 0x00},
{0x0A, 0x07},
{0x0B, 0x00},
{0x0C, 0x01},

And when I use the second example, by connecting to IN1 to IN3 a 10 MOhm resistor to RLDOUT I detect no Lead-Off when reading ERROR_LOD: Lead-Off Detect Error Status register.

How is the workflow and the register settings when using the external resistors? I thought I have also to enable the Lead-Off detection and reading the Lead-Off Detect Error Status register. Is this right?

The only difference to the other way without the resistors is not to map RLD internal to one channel?

Regards

Eckart