FX3 consumed power vs data speed

Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

cross mob
GrWa_2302706
Level 4
Level 4
50 questions asked 25 replies posted 10 replies posted

Hi

Will FX3 consumed power decrease as USB real-time data speed decreases ?

Thanks and regards.

Grace

0 Likes
1 Solution
YatheeshD_36
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello,

The Icc USB current specified in the FX3 Datasheet determines the power consumer by the USB core. A maximum value is specified in the datasheet (refer to Table 8). This is the maximum value and the actual value can change dynamically. If the FX3 is enumerated as a high speed device rather than a super speed device, the current consumed by the USB core is expected to reduce. This also depends on the power state the device is in.

Thanks,

Yatheesh

View solution in original post

0 Likes
3 Replies
YatheeshD_36
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello,

The Icc USB current specified in the FX3 Datasheet determines the power consumer by the USB core. A maximum value is specified in the datasheet (refer to Table 8). This is the maximum value and the actual value can change dynamically. If the FX3 is enumerated as a high speed device rather than a super speed device, the current consumed by the USB core is expected to reduce. This also depends on the power state the device is in.

Thanks,

Yatheesh

0 Likes

Hi Yatheesh

If the FX3 is enumerated a super speed device, will the current consumed by the USB core be related to the real-time USB data speed ?

Thanks and regards.

Grace

0 Likes

Hello Grace,

Focusing only on the USB side of the application, If you are referring to the power consumed by the USB core only during the data transfers, then the power consumption is dependent more on the duration of the data transfer in the application and less on throughput of the transfer.

If there is a continuous streaming of data, power consumption will be higher, compared to when there is less amount of data transfers, in the same time duration.

Considering throughput of the USB interface: There may be many factors responsible for the throughput (the host controller, host application, and firmware implementation). There will be a minimal variation in power due to the change in throughput.

Also, do refer to this KBA EZ-USB® FX3™ Power Consumption – KBA85505

Thanks,

Yatheesh

0 Likes