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Sniffing the Rigol's internal I2C bus

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Carrington:
Some changes in the input stage (resistor and trt) from NON-A to A (in Black HW 2.0 NON-A):



I guess that they have also changed some capacitors. Any volunteers to measure their value?
Note: Resistor without marking code -> unknown value.

Carrington:

--- Quote from: AndersAnd on December 24, 2013, 01:44:56 am ---Analog Devices ADR5044A (4.096 V Precision Micropower Shunt Mode Voltage Reference) has a R2W marking on it. (See bottom of page 14):

...

Not sure if any other devices has the same R2W marking on them too or not.

--- End quote ---


Impossible. Must be a NPN trt. I'm pretty sure that is a BF93A (R2*).

* = p -> made in Hong kong.
* = w -> made in china.


Other possibilities (NPN and SOT23 only):
http://www.ecadata.de/searchnew/index2.html

Carrington:

--- Quote from: cybernet on December 23, 2013, 11:15:19 pm ---Mode 0 and Mode 1?

...

Likely the BMODE pins of the BFIN - toggle between flash/spi boot - where spi is what they use to flash the bootldr - one of my first posts in that thread was regarding bmode pins.
if somebody wants to mess with them with boundary scan u can check the bfin pins logic levels nicely.

--- End quote ---
Maybe I read it. I no longer remember.
Sorry.

Wim13:
Also posted in the main Rigol topic, but for the others, i updated my bandwidth chart with the 300 Mhz option.
There is not much enhancement for the non A models. Even worse, it not very stabel the 300 Mhz
option . That is i think why Rigol never sold 300 Mhz versions of the non A.

Some others also measured, and there are differences around 1 dB, which is normal
for devices at the end of there capabilities. These measurements are all made on the same 2072.

So i will stay for DSEZ, the E for CAN and the Z for DS2202 with al options.

Edit: the bandwidth is measured only on hardware version 1.0.1.0.0

alank2:

--- Quote from: Wim13 on December 25, 2013, 04:11:59 pm ---Even worse, it not very stabel the 300 Mhz option.
--- End quote ---

Can you expand on this a bit?  What was not stable?

I looked at my other 2072 which has been untouched until now.  It has 3 keys VSAB, VSAC, and VSAE to load the trial options, so my theory that the SN/model are loaded with keys is false.  The 4 keys for the unit that was dumped here probably includes a can trial too which explains the extra key.

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