3.3V Current Draw for No External Memory ?

ChrisNielsen — Fri, 12 Jul 2013 19:32:50 GMT

Does anyone have measured or simulated values for the above system under rather heavy CPU loading (NEON in use, cache in use)? 500 MHz CPU.

I'm executing in true microcontroller mode with no DDRX, SRAM, parallel FLASH, nothing on the external bus. I'm booting from an SPI FLASH part that loads into RAM, executes, then idles.

Peripherals in use: SAI (768Kbps), DMA (slow, 96 KB/sec)

I'm trying to design the power supplies (DC/DC or LDO) from my wall adapter input on down (wall will be 4.2V, 4.5V, or 5.0V). I could spin a board with only my exact schematic configuration plus several power options (large pcb, not final), characterize power, then spin another board with final optimal power parts -- tough on the schedule. It appears that the Tower schematic is well partitioned and I might be able to measure the current at various power header jumpers -- has anyone done this? Did measurements match the final board or were there surprises from missed rails?

Or, is there an Excel spreadsheet where I can enter various parameters for my system and see the impact on mA on the rails?

Thanks, Chris

Re: 3.3V Current Draw for No External Memory ?

naoumgitnik — Wed, 17 Jul 2013 22:11:46 GMT

Dear Chris,

We do have power consumption data for various use cases. However, according to our company policy, we can only share them with customers having signed an NDA.

The proper way of requesting such data is via your local Freescale FAE.

Sincerely yours, Naoum Gitnik.

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3.3V Current Draw for No External Memory ?

Re: 3.3V Current Draw for No External Memory ?