MPC8536DS Baord Sleep mode due to 10Ω Resistive load connected in the system?

AshishAgarwal — Wed, 13 May 2009 18:04:15 GMT

Hello All,

I know this can be silly question.

I am usiing MPC8536DS system baught from Freescale.

firstly i was able to do my stuff over this system before, now a days due to some customiztion needed on the board desgin i deaattached the motherboard and the SMPS(PSU) from the Mounted CPU Box.

I dismounted theall the wires of chasis power, reset and LED wires.

When i booted the system now, it goes in the sleep mode every time i boot it in approx 4-5 secs.

I tried lot of things lastly i review all the work and trced there were two 10Ω resistive loads connected with in the chasis of system. so when i connected those too the system works fine

though it worked for me but i am still not clear about why those two resistive loads are needed there.

resistive loads

or they can view by CLICK HERE

the rarting written over there is

"DALE RH-50W

10Ω 1% MEXICO No829"

The reason for asking this : newly designed customized board Hw going in sleep mode all the time. (even after coneenting the same resistive laods too)

If anyone can clear me what the purpose of those Resistive loads it may be a great help for me.

Re: MPC8536DS Baord Sleep mode due to 10Ω Resistive load connected in the system?

AshishAgarwal — Mon, 18 May 2009 11:45:56 GMT

Freescale support Solution :

"1) Dummy loads in the Calamary Developmen System are required because of low power consumption of the DS board alone - i.e. when no aditional cards are inserted into PCI Express, Extender and PCI slots. In this case stable operation of the PSU (ANTEC TRUEPOWER TRIO 550) is ensured by the +5V and +12V dummy loads (DALE RH-50W)."

topic Re: MPC8536DS Baord Sleep mode due to 10Ω Resistive load connected in the system? in Other NXP Products

MPC8536DS Baord Sleep mode due to 10Ω Resistive load connected in the system?

Re: MPC8536DS Baord Sleep mode due to 10Ω Resistive load connected in the system?