MDIC0 and MDIC1 resistor power for P2020

cancel
Showing results for 
Search instead for 
Did you mean: 

MDIC0 and MDIC1 resistor power for P2020

144 Views
toddreed
Contributor I

Hello,

I need to ensure that the MDIC resistors do not fail derated power limits.  What is the estimated power usage for a 40.2 ohm resistor on MDIC0 and MDIC1?

Thank you,

Todd

 

Labels (1)
0 Kudos
3 Replies

137 Views
toddreed
Contributor I

Hi Bulat,

Thank you for your response.  I currently have 0603 resistors in there that are rated for 0.1W max, but I have to derate them to 0.056W.  Is this OK, or should my derated max be > 0.1W?

Thanks,

Todd

 

0 Kudos

117 Views
Bulat
NXP TechSupport
NXP TechSupport

Yes, it is OK. 'Maximum theoretical power' can be calculated as GVDD x GVDD / 40.2. This results in about 80mW for DDR2 and 56mW for DDR3. In fact the peak power dissipation would be less, so no problem with resistor's size.

Regards,

Bulat

 

0 Kudos

138 Views
Bulat
NXP TechSupport
NXP TechSupport

Those resistors are used during hw calibrations, i.e. relatively short time. Theoretically possible peak power is less than 0.1W, so resistors size 0402 is ok.

Regards,

Bulat

 

0 Kudos