CC3220: Running uDMA in low power mode.

Pratik Agrawal4

Part Number: CC3220

Hi,

We would like to run the uDMA on the CC3220 to collect data over the I2S/I2C channels. The data collection over the I2C will occut at 5 Hz and over I2S at 16 Khz. If we keep the I2S, I2C and uDMA on for this I assume we cannot run the LPDS mode. What is the lowest power mode we can run on CC3220 while continously collecting data over I2S and I2C to DMA? What is the lowest power consumption we can achieve with just these three aspects of the chip operating? The NWP will be idle connected (so presumably LPDS mode) during this operation.

Thanks,

Pratik

over 7 years ago

0 Vincent Rodriguez over 7 years ago

TI__Mastermind 28285 points

Hey Pratik,

You are correct, if you wish to use I2S and I2C with uDMA, you will need the MCU to be in Active mode. There should be times though the device will be waiting for the uDMA to complete, and the device will enter the Sleep mode. This current is around 12~13 mA. The amount of time the MCU is in this mode is probably small, the impact to overall current consumption would probably be low.

VR

0 Pratik Agrawal4 over 7 years ago in reply to Vincent Rodriguez

Prodigy 120 points

We expect most of the time the device to be waiting for uDMA to complete. Is the current 12-13ma during sleep mode if we turn everything off in the system?

0 Vincent Rodriguez over 7 years ago in reply to Pratik Agrawal4

TI__Mastermind 28285 points

Yes,

If everything is off and the mcu goes to sleep, the current should go to 13 mA. If the peripherals are on (I2S,I2C, uDMA), you can probably expect around 3 mA extra current draw. I would suggest running some experiments to test and see what current values you can expect.

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CC3220: Running uDMA in low power mode.