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MSP430FR2000: Find a fast start-up power-on mcu less than 10us

user4873309
Prodigy 80 points
Part Number: MSP430FR2000

In our project, we wanna use wiegand sensor to count the times while it activated when system is out of power.

Wiegand sensor could generate a 10us width regulatered pluse after it activated, we wanna using this pluse to power the chip and read --> increase/decrease --> store the counter, and when the system is powered-on, other mcu could read the counter register from this chip.

So, we need fram to achieve this, and MSP430FR series already embeded fram, I wanna know is there exists a type of mcu in TI could achieve power on then do above procedure in 10us?

If you got some information, please let me know and thanks for your help.

Zheng

  • 0
    TI__Guru**** 216567 points
    Hi Zheng,

    As seen in Section 5.13.2 of the Datasheet, the MSP430FR21xx/20xx devices typically take 1 ms to wake up from a RST/BOR event to active mode. Furthermore, MSP430 devices start at a default CPU speed of 1 MHz and as such 10 us would only allow for 10 cycles with which the MCU would need to perform the procedure mentioned. The timing dependencies will need to be greatly relaxed for a MSP430 device to work in this application.

    Regards,
    Ryan
  • 0 in reply to Ryan Brown1
    Prodigy 80 points

    Hi Ryan,

    Thanks for your reply, so the MSP430FR series couldn't work in this application, do you have any suggestion about the other series MCU in TI with fast power-on reset wake time, we can use a single FRAM around the MCU and communicated with SPI or I2C for this procedure. : )

    Zheng

  • 0 in reply to user4873309
    TI__Guru**** 216567 points
    I don't have expertise with any other TI MCUs and the MSP430 is the only microcontroller that incorporates FRAM technology. Your project's requirements may be too strict for a MCU.

    Regards,
    Ryan
  • 0 in reply to Ryan Brown1
    Prodigy 80 points
    Thanks Ryan, I have searched many MCU and they need wakeup time both longer than 10 us, maybe I need to find an another solution instead of MCU to achieve this goal.


    Zheng

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