RM48L952: Power dissipation of the RM48L952

Bob Bacon

Part Number: RM48L952
Other Parts Discussed in Thread: TMS570LS3137

Hello

Our plan at present is to set HCLK = VCLK = 110MHz.

The guidance on current consumption when the clock frequency is reduced assumes HCLK = 2 × VCLK which does not cover our case.

Do you have a model for power consumption that will cover our case. If the model includes the effects of enabling and disabling the various functions as well that would be great.

Many Thanks
Bob Bacon

over 8 years ago

0 QJ Wang over 8 years ago

TI__Guru**** 197336 points

Hello Bob,

Please refer to the application note (SPNA173): "Reduction of Power Consumption for TMS570LS3137"

This application report describes methods to reduce the power consumption of the Hercules based microcontrollers and gives indications for the reduction that can be achieved.

0 Bob Bacon over 8 years ago in reply to QJ Wang

TI__Genius 10815 points

Hello
Thanks for the information but the graph on page 11 makes the same assumption the ratio of Hclk to Vclk is fixed at 2:1.
Can you confirm that this is valid ?

Thanks
Bob Bacon

0 Bob Bacon over 8 years ago in reply to Bob Bacon

TI__Genius 10815 points

Just like to rephrase this
If we use HCLK = VCLK = 110MHz (rather than VCLK/HCLK ratio of 2:1) can we make similar assumptions of HCLK v's power consumption.
Regards
Bob Bacon

0 Bob Crosby over 8 years ago in reply to Bob Bacon

TI__Guru 72500 points

Hi Bob,
The ratio of VCLK/HCLK is critical to the frequency de-rating found in the datasheet. Yes, we have a model but it is not available externally. According to the model changing from HCLK/VCLK of 220MHz/110MHz to 110MHz/110MHz reduces the switching current by 43mA.

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RM48L952: Power dissipation of the RM48L952