Hi,
Our customer send the POWERDOWN command to ADS1220 but the total system current is not changed obviously.
So, do we have a simple way to verify if ADS1220 is in power down mode or not?
Thanks.
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Hi,
Our customer send the POWERDOWN command to ADS1220 but the total system current is not changed obviously.
So, do we have a simple way to verify if ADS1220 is in power down mode or not?
Thanks.
Hi Oliver,
Depending on the ADS1220 configuration the POWERDOWN command may not change the current that much as compared to the standby (or idle) state as compared for the analog supply. The POWERDOWN command will turn off the IDACs (if they are turned on) and open the low-side switch if it is being used. In single-shot mode after the conversion has completed, the ADS1220 will go to a low power state by turning off the internal oscillator and all analog circuitry except the IDACs (and opening the low-side switch if configured to do so). Where a power difference will be seen for the ADS1220 itself is when using the POWERDOWN command when the IDAC current sources are used.
If you want to see if the POWERDOWN command is working, then I would suggest using the IDACs and seeing if the IDAC current stops when the POWERDOWN command is issued.
Best regards,
Bob B
Hi Bob,
Thanks for your explanation, consider this chip ADS1220 is used in a wearable device, the standby current is the main concern for our project. as the datasheet description, in power-down mode, the current of AVDD is 3uA and DVDD 5uA, what's the configuration process? then we can achieve that low current result.
thanks!