Increased Peak Advertising Current

RE: Increased Peak Advertising Current

Justin — Wed, 11 Mar 2020 00:45:58 GMT

Thanks Kenneth for the clarification.

RE: Increased Peak Advertising Current

Kenneth — Tue, 10 Mar 2020 11:57:04 GMT

Hi,

It may also be an invalid BLE packet from a central device (e.g. scan request packet with CRC errors due to interference and/or a connection request packet CRC with errors), in these cases the radio may stay in receive mode until a timeout occurs.

Best regards,
Kenneth

RE: Increased Peak Advertising Current

Justin — Mon, 09 Mar 2020 23:27:44 GMT

Hi Kenneth,

We captured 3 screenshots using the same scale that shows a normal advertising current pulse, the slightly higher pulse that we saw before which we associated with the scan response, and the new higher amplitude pulse that we observed and don’t know what it is.

We see the higher amplitude pulse occur during the channel 37 activity. With the Ellisys BLE sniffer, it does not appear that this is linked to a scan response.

Is there anything that we are not counting for?

RE: Increased Peak Advertising Current

Justin — Thu, 05 Mar 2020 15:25:14 GMT

[quote userid="2111" url="~/f/nordic-q-a/58711/increased-peak-advertising-current/238194"]This is likely a central that is transmitting a scan request packet, and then the peripheral will reply with a scan response packet. This typically happen on 1 of the advertisement channels[/quote]

Putting my setup into the anechoic chamber did eliminate the occasional larger advertising current peaks.

As a result, the larger peaks do appear to be linked to some device behavior related to scan requests coming from central devices.

But in that case I would expect a longer period of a Tx --> Rx --> Tx --> Rx current draw rather than a higher current draw.

Is my understanding correct?

RE: Increased Peak Advertising Current

Kenneth — Thu, 05 Mar 2020 09:00:45 GMT

Hi,

This is likely a central that is transmitting a scan request packet, and then the peripheral will reply with a scan response packet. This typically happen on 1 of the advertisement channels, but may also happen on more than 1 channel if there are more than 1 central nearby.

Best regards,
Kenneth