• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 79 subscribers
  • Views 266 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

MSP430FR2311: Connecting VCC for Spy-Bi-Wire programming

George Fleming II
Prodigy 200 points
Part Number: MSP430FR2311
Other Parts Discussed in Thread: MSP-FET

I have a  MCU that will be connected to a lithium battery when getting programmed with Spy-bi-wire interface. Let's say the programming device has 3.3V VCC and is connecting the the Test/Reset/GND/VCC pins of the PCB board. When being programmed, the unit will already be fully assembled and a lithium battery would be installed and permanently connected in the system.

When I connect and begin programming with Spy-Bi-Wire, is it required to have the VCC's connected between programmer and MCU? I am wondering if it would be sufficient to just connect the GND, Test, and Reset signals during production programming. The reason for my concern is that would there be a risk to damaging the Lithium battery connected in the system while the 3.3V programmer is also connected to VCC?

  • 0
    Guru 33653 points

    If VCC on both sides (SBW master and target device) is equal (for example 3.3V with some datasheet tolerance) VCC (between devices) can be disconnected.

    If there is some difference in VCC level, than you should use MSP-FET like tool that have connecting option with separated (isolated) VCC line between master and target device. In this setup master will work on it own supply without draining battery, while target board will be powered on battery.

  • 0 in reply to zrno soli
    TI__Mastermind 32920 points

    Add more inforamtion for connecting external power supply for MSP-FET:

**Attention** This is a public forum