fitlet USB power behavior
Some ports designed to keep USB power during low power state:
- Two back panel ports: On during S0, Off during S3-S5
- Front panel ports: On during S0-S5
- Combo port (not on MintBox mini): On during S0 only
- S0 - active
- S3 - sleep
- S4 - hibernate
- S5 - Shut down (SW off)
Why I get black screen when powering up Barebone fitlet?
You must install RAM first to get display signal from fitlet.
What kind of RAM can I install in fitlet?
DDR3L-1333 1.35V SODIMM (DDR3L-1066 for fitlet-B). See also tested RAM modules list
Why does fitlet freeze when I am trying to run Memtest86+?
Memtest86+ (as of version 5.01) does not support AMD Mullins SOC http://www.memtest.org/#change
We recommend the commercial version of the Passmark Memtest86 Pro. http://www.memtest86.com/
Which power supplies can power the fitlet?
fitlet bundle comes with external AC/DC wall power supply, providing unregulated 10–15Vdc input voltage range, 12Vdc nominal. However, any power supply able to supply 36W output 12VDC @ 3A source will be fine.
How long can the battery power the fitlet if unplugged?
Please verify FAQ Fitlet Batteries page
Pigtail unterminated DC cable
Pigtail DC cable - unterminated on one end and on the other uses standard 5.5mm x 2.5mm barrel plug with mechanical twist-lock.
Can be used with IPC2, Intense PC, fit-PC4/3 and fitlet computers.
- Order from Compulab accessories
- Order info:
- Compulab PN: 504F010040
- L=150cm, 5.5/2.5 plug diameters, tinned ends, #16AWG
What are power capabilities of fitlet USB ports?
USB ports VBUS (5V) pair supplied via onboard power switch with current limit set to 2.3A, which means either each USB port capable sourcing up to 1.15A in case two bus powered devices are connected, or sourcing 2.3A in case single bus powered device is connected.
My SSD inside fitlet reports high temperature. Is it normal?
SSDs vary in the power they dissipate. See for example this Tom's Hardware article.
It is recommended to opt for a low power SSD.
fitlet thermal envelope is quite tight due to its small size and fanless operation, so high temperature of an internal heat-dissipating component is to be expected. However, SSDs are very temperature tolerant so the reported temperature is not expected to affect reliability.
Is it OK for fitlet to run hot?
Yes. fitlet is very tolerant to high temperatures. The small form factor and passive cooling may result in operation temperature that is higher than the temperature of computers with fans. Users that are not familiar with miniature fanless PCs are often concerned about temperature, but the operation temperature does not have effect on reliability and safety. Actual temperature varies depending on ambient temperature, ambient airflow, workload and devices - both internal and connected.
Unlike computers with fans that experience degradation in thermal performance over time and may overheat and fail catastrophically in case of fan failure, fitlet thermal performance is uniform and is not subject to aging.
Setting fitlet power consumption limit
fitlet BIOS allows users to set processor's maximum power consumption limit. Power setting APU TDP option accept values between 1-25000 [mW], when default value is 4500 [mW]. Higher value means better performance, and hence higher temperature. For more refer to fitlet BIOS guide.
In very rare cases a weak high frequency audible noise can be heard from computer system -
“Coil whine” and piezo noise from ceramic capacitors is a documented phenomenon that cannot be 100% eliminated. It is unlikely to be as loud as the fans found in most computers, and is usually less audible than the noise emitted by hard disks.
An interesting phenomenon is that this electronic noise is often reduced under load (due to less power switching/trimming). Some users apply less aggressive power management and report reduction in noise.
GPIO drive capabilities
GPIO drive strength value is configured via GPIO control registers and have 4 possible configurations: 4mA, 8mA, 12mA, 16mA
GPIO pins are not opto-isolated in the fitlet model.