• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 79 subscribers
  • Views 366 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Auxiliary battery for MSP430

mithun sappannavar
Intellectual 585 points
Other Parts Discussed in Thread: MSP430F5418

Hi All,

One of my customer is using MSP430F5418 for a POS application. 

we have a rechargeable battery. But to maintain critical information when the rechargeable battery dies, the MSP430 has to be kept alive (very low power consumption) thru a auxiliary battery. Now we obviously don't want to connect the two batteries in parallel ... So what we need is a switch over mechanism from rechargeable to a coin cell when the rechargeable goes dead and switching back when there is enough voltage/energy in the rechargeable.

Any application note/idea as to how to attempt this switch over between the batteries ?

Regards

mithun

  • 0
    Guru 227245 points

    I think there are external power supply chips which can switch from one supply to another when voltage drops below a threshold.
    Or coyou can measure supply voltage with the MSPs ADC and switch the backup online usign a FET (you'll require a diode on the main supply, so it won't discharge the backup)

    Or, this is the third option, you simply store the valuable information into info flash or unused parts of main flash, so they will survive a complete power loss.

**Attention** This is a public forum