Hello Per,



Since the microcontroller is INSIDE then PSU and I am working mostly in Morocco, Turkey and Iran where we have environement temperatures of 50°C, the microcontroller MUST support at least 85°C permanently which is like a BURN-IN test.



But Kail is for Windows peoples which have no clue about commandline coding ;-) under GNU/Linux.

I use SDCC on the command line and my editor is "mc" (Midnight Commander)



Right, speed is no issue and for firmware upgrades it is a need, since the lifetime of my products are 5years and more.



The ADC should messure a voltage of 0-2.5V

IF I go over I²C using the MAX1036/38 then the sampling rate would be maximum 138kHz which is already a killer and not required...

Since the ADC is the middle-man between the MAX9937 (current sense) and the microcontroller, and the highest current is arround 15A (for the Uin of nominal 24V) a resolution of 8-10 bit should be enough and a higher precission ±50mA is NOT required.

For the other output voltages (+12V, +5V, +3.3V, +5Vsb) the higest current is 15A and even here, a precission of ±50ma is enough.

for the -12V is is not realy important



It must be easy to maintain in the future including firmwares upgrades over USB.

So in summary, the microcontroller should collect Data from

1) Maxim DS1780 (I²C Hardware monitor ->voltages, Fan, Temperature)
2) 6 current sensors -> 6-Channel ADC as above

3) collect data from up to three expansion slots using I²C (->max 4 x voltage and 4 x current and 1 x temperature)

then use the USBHID-PDU protocol and send it on request (from the UPS controll program running on the Computer) over USB.

Since the UPS controllprogram does not poll the PSU/UPS/PDU more then 2 times per second (which is not recommended) the microcontroller has many time to update/prepare the data-table.

Thanks for your time
Michelle