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RF430FRL152H: Current Draw

Part Number: RF430FRL152H

What is the current drain from a 1.5V battery during writes to FRAM memory. Is a block write of more than 1 word required?

How long does it take to unlock a section, write, read back to verify and relock the section to store 8 bytes into FRAM.

Does the DC-DC step up converter need to be active during this time?

  • Hello Taylor,

    Are these questions assuming NFC communication, or that another MCU is accessing the RF430FRL152H FRAM?
  • Hello Taylor,

    I'm going to assume you mean for NFC communication as that would be the expected use case.

    taylor Smith1 said:
    What is the current drain from a 1.5V battery during writes to FRAM memory.

    I don't believe this has been spec'd but in general you are looking at current draw from ROM spec at minimum. If the FRAM power draw is at the level of code execution for the duration of the write, which is what I would anticipate as write and read draws the same amount of power, that would be a bit higher but for a short duration as the write time is max 125 ns per byte.

    taylor Smith1 said:
    Is a block write of more than 1 word required?

    By default, writing one block of data over RFID programs 4 words at a time as the device operates with an 8-byte data length by default. The data length can be changed to be 4-bytes long instead which is just 2 words at a time. 1 word at a time is not possible.

    taylor Smith1 said:
    How long does it take to unlock a section, write, read back to verify and relock the section to store 8 bytes into FRAM.

    That is application specific and is not specified on our end as it is dependent far more on the NFC reader and the over-the-air data rates than anything within our device. For example, the time for over-the-air communication to transmit a single block of data is larger than time to write to a block of FRAM, so the bottleneck is never on our devices end as it cannot receive data quick enough to cause any issues.

    taylor Smith1 said:
    Does the DC-DC step up converter need to be active during this time?

    I presume the DC-DC refers to the VDD2X voltage doubler module used to power the FRAM portions of the device? If so, then yes, as long as FRAM is being accessed that will need to be active.