RE: Anomaly 211 description

ovrebekk — Mon, 14 Dec 2020 08:49:04 GMT

You welcome Krystian 🙂

RE: Anomaly 211 description

KrystianL — Fri, 11 Dec 2020 15:15:21 GMT

Hello,

thank you for exhaustive response.

RE: Anomaly 211 description

ovrebekk — Fri, 11 Dec 2020 11:05:44 GMT

Hi Krystian

Sorry for the slow response, it took some time to get to the bottom of this.

Apparently this issue is caused by certain old USB hubs, which don't follow the USB specification properly when handling USB suspend.

When the investigation was started this was treated as an anomaly, but since the problem was found to be on the hub side, and not on the nRF side, it doesn't count as an anomaly in the nRF device. This is the reason there is no mention of this in the errata.

A workaround is in place to add tolerance for the behavior of these USB hubs, but applying the workaround will increase the sleep current significantly. This might not be a problem for a USB device, which typically has plenty of power available through the USB port, but to avoid increasing the current consumption for all USB applications the workaround has to be enabled specifically by setting this define.

Best regards
Torbjørn

RE: Anomaly 211 description

ovrebekk — Thu, 26 Nov 2020 12:53:51 GMT

Hi Krystian

I will need to do some checking internally to figure out what information there is to share about this issue.

I will try to get back to you in a couple of days.

Best regards
Torbjørn