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Options for low power consumption external 1Gb memory (or even more)

Alex Beloff
Intellectual 570 points
Other Parts Discussed in Thread: MSP430FR2111

Hello,

I'm trying to understand if there are low power options to SD cards. From what I can find in the internet SD cards consume 60-100 mA when writing data. So I thought maybe I could use other type of RAM (even not persistent) but it must consume very low power. I tried to read about FRAM but is there a low-power MCU with 1Gb of RAM or more?

I need it for a project which uses 3-3.6V LiPo battery.

Can you please point me to the right direction?

The other option would be to use Bluetooth but I guess Tx consumes about the same (considering it will send lots of data).

Thank you.

Alex

  • 0
    Intellectual 570 points

    For now, I found this Macronix flash memory which seems to be what I need:

    "MX25R6435F is 64Mb bits Serial NOR Flash memory, which is configured as 8,388,608 x 8 internally. When it is in four I/O mode, the structure becomes 16,777,216 bits x 4 or 33,554,432 bits x 2. MX25R6435F feature a serial peripheral interface and software protocol allowing operation on a simple 3-wire bus while it is in single I/O mode. The three bus signals are a clock input (SCLK), a serial data input (SI), and a serial data output (SO). Serial access to the device is enabled by CS# input. When it is in two I/O read mode, the SI pin and SO pin become SIO0 pin and SIO1 pin for address/dummy bits input and data output. When it is in four I/O read mode, the SI pin, SO pin, WP# pin and RESET#/HOLD# pin become SIO0 pin, SIO1 pin, SIO2 pin and SIO3 pin for address/dummy bits input and data output."

    Can you please tell if it would be possible to work with it using MSP430FR2111 MCU. I have two doubts:

    1. I don't really understand what does it mean to "When it is in two I/O read mode" and "When it is in four I/O read mode".
    2. The MCU is 16 MHz and the memory works at 80 Mhz (or 33 Mhz). Would this be another problem?

    Thank you.

  • 0 in reply to Alex Beloff
    Guru 99675 points

    1) Those refer to quad-SPI mode, which uses multiple (2 or 4) data lines in parallel, usually by adopting some off the other pins. As far as I know none of the MSP430s or MSP432Ps support this. (Doing it in software is probably a net loss.) The MSP432E series does support this in its QSSI.

    2) 80MHz refers to the maximum SPI (clock) rate. You can run an SPI down to (near) 0Hz. 

    Micron makes a 1Gb SPI NOR flash (MT25TL01GBBB8ESF-0AAT), but it's somewhat pricey. It claims ~25mA acftive, 35uA inactive. [This is an existence proof, not a recommendation.]

    NAND flash is much cheaper per byte than NOR, but is more complex to work with. Micron, WinBond, ISSI, and Toshiba (and others, no doubt) make these.

    You'll need to balance size/price/power/complexity. The Search facility at Mouser or Digikey can help here.

  • 0 in reply to Bruce McKenney
    Intellectual 570 points

    Thank you, this is great to know!

    This memory has 10mA for writing mode. That's why it's interesting. It's a bit slow though.

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