[linux-dvb] Re: Kernel OOPS

["Robert Schlabbach" <robert_s@gmx.net>]

From: "Ralph Metzler" <rjkm@metzlerbros.de>
> I also cannot say for 100% that the power supply explanation is
> correct. That's only what I heard indirectly. Maybe there really is
> more to it.

There is definitely something to it - I just bothered to take a real look
at the CIS from my yellow ZetaCAM, and the power information says:

0x55 <- Nom V : EXP=5 (1V),    MNT=10 (x5)   -> 5V
0x4D <- Min V : EXP=5 (1V),    MNT=9  (x4.5) -> 4.5V
0x5D <- Max V : EXP=5 (1V),    MNT=11 (x5.5) -> 5.5V
0x56 <- Avg I : EXP=6 (100mA), MNT=10 (x5)   -> 500 mA
0x56 <- Peak I: EXP=6 (100mA), MNT=10 (x5)   -> 500 mA

So the CAM is working at a nominal voltages of 5V (with a tolerance from
4.5V to 5.5V), but the average current is 500mA.

This is a clear violation of EN50221, A5.5.10, which specifies:

"
Each module shall neither consume nor

dissipate more than 1.5 watts. Additionally the power supply current to
each module (sum of Vcc current and

Vpp current) shall not exceed 300mA long term, and the short-term peak
current is limited to 500mA for no

more than 1ms."






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