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Need help selecting an appropriate smaller brother of MSP430F5437

Heiner Busche
Prodigy 10 points
Other Parts Discussed in Thread: MSP430F5437, MSP430F5327, MSP430FR2355, MSP430FR5959, MSP430I2041

Hi Folks,

we've been using the MSP430F5437 for a couple of years in a hand held device that is equipped with an ethanol fuel cell sensor. Years ago we choose that MCU because it had a rather large flash memory and a good 12 bit ADC and many, many I/O ports for different peripherals.  

Now we plan to to make a very reduced version of that device, downsizing this to a real minimum version without display and other stuff.

So we basically need a smaller brother of that MCU. Small in size, only a few I/Os, UArt, I2C, 2 timers are enough. 

The signal from the ethanol fuel cell detector is a rather slow DC signal. So no special speed requirements. 

Ethanol signal is channel 2

Probably most available MSP could do that, but essential to our measurement is an exact (stable) AD-Conversion,

with a stable internal voltage reference  and a stable internal time reference over a wide temperature range.

Currently we use 12bit ADC. Most of smaller MCUs have only 10bit ADC.

Since we calibrate the sensor with a reference gas and get a reference curve, stable reproducibility i(over time and temperature) s more important than absolute accuracy.

I'd like to stay within the MSP430 family to be able to reuse the JTAG flasher and IAR Workbench License for MSP430.

Is there any MCU you would recommend?

Thanks in advance!

HB

  • 0
    TI__Guru 56685 points
    Hello Heiner,

    We have several devices that can fit your needs. If you want to keep in a similar family of devices to the MSP430F5437 you are using now, then check out our MSP430F5327 and its memory variants (MSP430F532x). these devices go down to 64kB.

    If you need something smaller, then try out our MSP430FR2355 based devices. These devices are a bit different than the MSP430F5437 you are used to as these are FRAM based devices. You can also check out the MSP430FR5959 family as well .

    We do have a few other choices of devices with better ADCs (16/24 bit Delta Sigma ADCs), but most of these are going to be at the same amount of memory/features or more than the MSP430F5437 , with the exception being the MSP430I2041 series of devices.

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