The tolerance of voltage of DEC pins of 52840

RE: The tolerance of voltage of DEC pins of 52840

Andreas — Mon, 18 May 2020 11:11:56 GMT

Hi Han,

This is normal behaviour.

Best regards,

Andreas

RE: The tolerance of voltage of DEC pins of 52840

Hsu — Mon, 18 May 2020 08:06:49 GMT

HI Andreas,

We did some measurement for all DEC pin as below, could you help to check the tolerance?

And the ripple of DEC5 is large than other DEC pin, how do we fix this?

Thank you.

BRs, Han

RE: The tolerance of voltage of DEC pins of 52840

Andreas — Fri, 24 Apr 2020 11:25:03 GMT

Hi Han,

[quote user=""]In the datasheet of 52840, we know the DEC1 is 1.1V, DEC2/4/5 are 1.3V, DECUSB is 3.3V.[/quote]

This just refers to the 'name' of the rails to distinguish them from each other, it does not specify that e.g DEC2 is exactly 1.3 V. Voltages on all DEC pins will vary depending on the state of the regulator and the charge of the DEC capacitor. We do not specify tolerance or max/min on these rails, the voltages you are seeing are perfectly fine though.

Best regards,

Andreas