changelog v1.1

[filipswit]

• fixed LDO instable - input capacitance to low #68
• fixed mechanical issues v1.0.1 #67
• added 24AA025E48T-I/OT and 24AA025E48-I/SN on separate I2C bus parts availability #66
• added jumpers to BoM install J24 jumpers (USB SRST + POR) during production #54
• Added alternate LDOs - TPS74901RGWT
• Added alternate GPIO expanders - PCA9539APW

edit

• added revision signals - revision ID and variant ID #70
• swapped signals on MCP23017 - MCP23017 7th "ios" must be output  EEM_FMC_Carrier#46

[gkasprow]

@filipswit did you consult moving the EEPROMs to separate I2C interface with software guys?

[filipswit]

no, but default EEPROM, IC5 is not moved.
We can't add aditional footprint - sinara-hw/Kasli#97, because of conflict with SFP3 addres, so I made same solution as in Kasli v2.0.2

[kaolpr]

I believe there was some discussion on version naming convention and patch number (according to ..) was to be reserved only for compatible component replacements. Here I can see some issue fixes.

If such discussion was not written (honestly, don't remember) maybe we should write down rules on that.

[filipswit]

@gkasprow and @kaolpr so should I rename it to v1.1?

[gkasprow]

yes, since it requires software changes, there must be new revision

[gkasprow]

The R110 and R100 could be replaced with E24 values

[kaolpr]

yes, since it requires software changes, there must be new revision

@gkasprow How does it require software changes? IO expander has different address / registry map?

[gkasprow]

I2C EEPROM is connected in a different way

[gkasprow]

Before EEPROM was connected to shared bus, now it has a dedicated FPGA pins.

[gkasprow]

old-style regulators may not like 10uF at the output. I'd replace C376 with a 100nF capacitor and decouple it from LDOs 1uF caps with a few tens Ohm resistor. With a low ESR multi-uF load, it may oscillate.

[gkasprow]

@filipswit there is yet another issue that needs correction
The MCP23017 expander port 7 must be output. So we need to swap DISABLE with FAULT
I'd add a reistors for revision ID like in Kasli + one resistor for variant ID (a kind of expanders assembled) placed on the same sheet as I2C expanders

[filipswit]

decouple it from LDOs 1uF caps with a few tens Ohm resistor

You mean to place resistor (22R?) in series with 1uF at all LDOs Vbias inputs?
BTW. I can place any different LDO if you have any other cheap and small.

The MCP23017 expander port 7 must be output. So we need to swap DISABLE with FAULT

So it looks that IC24 is fine (these are test points) and in IC25 I should swap 'VUSB_PRESENT_N', with 'SFP_0.LED'?

I'd` add a reistors for revision ID like in Kasli + one resistor for variant ID (a kind of expanders assembled) placed on the same sheet as I2C expanders

I'll try to fit 3-4 rev ID bits and one variant ID resistor

[gkasprow]

decouple it from LDOs 1uF caps with a few tens Ohm resistor

You mean to place resistor (22R?) in series with 1uF at all LDOs Vbias inputs? BTW. I can place any different LDO if you have any other cheap and small.

just add a single 22Ohm (or similar already in the BOM) at the LDO output after the 100nF cap.

[gkasprow]

So it looks that IC24 is fine (these are test points) and in IC25 I should swap 'VUSB_PRESENT_N', with 'SFP_0.LED'?

yep, my bad

[filipswit]

Just verified the DS for this LDO, so it looks 470nF is absolute minimum i this case:

Would it be good enough solution?

[gkasprow]

OK, so you found better DS than me :)

[gkasprow]

No need for series resistor then.

[filipswit]

@gkasprow could you please look at the changes one more time?

[kaolpr]

@gkasprow @filipswit Can we assume v1.1 is reviewed?

[kaolpr]

@gkasprow Do you think sinara-hw/Kasli#99 should be implemneted here?

[gkasprow]

SOT-23 version of EEPROM is still not available

[gkasprow]

please add note close to the I2C expanders that ASSY variant need to be updated.

[gkasprow]

why both EEPROMs are not mounted?

[gkasprow]

Ah, I see, IC5 is connected instead...
I'd add 24AA025E48T-I/OT assembly variant to it as well.

[filipswit]

yeep, it should be added. I've made issue to not forget about it in next revision #72.