[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 this - 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

I.e. the CAM is working at a nominal voltages of 5V (with a tolerance from
4.5V to 5.5V), and the average (and peak) current is 500mA, a nominal power
consumption of 2.5 watts.

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.

So Neotion's CAMs are indeed outside the range specified in the CAM
standard.

Regards,
--
Robert Schlabbach
e-mail: robert_s@gmx.net
Berlin, Germany



-- 
Info:
To unsubscribe send a mail to ecartis@linuxtv.org with "unsubscribe linux-dvb" as subject.