msp430f5529 rocket board external power supply problem

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msp430f5529 rocket board external power supply problem [Copy link]

The msp430f5529 rocket board is a microcontroller development board commonly used in college electronic design competitions in the past two years. However, many participating students have caused the microcontroller development board chip to burn out and the board to be scrapped due to improper external power supply settings, which has caused great losses. The author has written the following with reference to relevant information from TI for your reference. Please criticize and correct any inappropriateness.

Using an external power supply

The F5529 LaunchPad target board can use not only USB power but also external power. However, you must be careful when using it. The external power supply can be powered by either a direct power supply or a battery booster pack.

Figure 1. Default power supply module under USB power supply

External 3.3V power supply

It is best to unplug all jumpers on the isolation block to completely disconnect the emulator from the target board, so that the MCU in the emulator will not consume external power current through the I/O port. You can also keep the 5-V jumper so that USB operations can still be performed and the 5V power supply of the target board is still valid.

Figure 2. External 3.3V power supply

1. Remove the 3V3 jumper cap of the isolation block to avoid conflicts between the 3.3V power supply of the emulator and the external 3.3V power supply. The 5V jumper cap can be retained.

2. If the external voltage applied to the target board is not accurate 3.3V, please remove the SBW RST and SBW TST jumper caps in the jumper isolation area. The emulator works at 3.3V and communicates with the target board. If there is a significant difference between the external 3.3V voltage and the emulator 3.3V voltage value, the high voltage side will supply power to the low voltage side, causing unpredictable consequences.

3. Connect the external power supply to the appropriate location, either the 3V3 pin header on the lower right corner or the 3V3 pin header on the expansion board (BoosterPack).

Note: In step 2, when the external voltage deviates from 3.3V, the simulation cannot be performed. However, the USB interface can still be used because the VBUS and VUSB, DVCC and AVCC of the USB module are disconnected.

Use external 5V power supply when USB interface is disconnected

If the USB interface is not needed, the 5V jumper cap in the isolation block jumper can be retained. In this case, the 3.3 V power supply is derived from the direct-to-direct converter in the emulator part and is used to power the target board through the 3V3 jumper cap. If external 3.3 V and 5 V power supplies are used, they can be handled separately as described above.

Figure 3: External 5V power supply when USB interface is disconnected

Use external 5V power supply when USB interface is connected

In some specific cases, it is advantageous to use an external 5V power supply when the USB interface is connected. The USB interface can be used for USB communication or programming through an emulator. In this case, the 5V jumper cap in the isolation block should be unplugged and disconnected to ensure that the two 5V power supplies are independent of each other. If both 3.3V and 5V power supplies are connected at the same time, please configure them separately according to the recommended method.

Figure 4. External 5V power supply when USB interface is connected