How do I protect the FSUSB42UMX from overcurrent conditions?

Author: Wolfchip.com · Date: 24-05-02 23:05:09

The FSUSB42UMX is a bi-directional, low-power, two-port, high-speed, USB2.0 switch¹². It's designed for ultra-portable applications, such as cell phones, and can be used in devices like PDAs, digital cameras, printers, and notebook computers¹².

The FSUSB42UMX itself does not have built-in overcurrent protection. However, it does contain special circuitry on the switch I/O pins for applications where the VCC supply is powered-off (VCC = 0 V), which allows the device to withstand an over-voltage condition¹. This feature can help protect the device from damage due to excessive voltage, but it does not provide protection against overcurrent conditions.

To protect the FSUSB42UMX and other components in your system from overcurrent conditions, you might consider implementing an overcurrent protection circuit in your design. This could be achieved using components such as fuses, circuit breakers, or current limiting ICs.

Here are some general steps you could follow:

1. Identify the Maximum Current: Determine the maximum current that the FSUSB42UMX and other components in your system can safely handle.

2. Choose an Overcurrent Protection Device: Select a device such as a fuse or a current limiting IC that triggers or breaks the circuit when the current exceeds the maximum safe current.

3. Place the Device in Series: The overcurrent protection device should be placed in series with the power supply to the FSUSB42UMX. This way, when an overcurrent condition occurs, the device will limit or cut off the power supply to the FSUSB42UMX, protecting it from damage.

4. Test the Circuit: After implementing the overcurrent protection, test the circuit under controlled conditions to ensure that the protection works as expected.

Please note that this is a high-level overview. The actual implementation will depend on the specific requirements of your system. Always refer to the manufacturer's documentation for accurate information¹². If you need further assistance, please let me know!

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(1) Low-Power, Two-Port, High-Speed, USB2.0 (480Mbps) UART Switch. https://www.onsemi.com/pdf/datasheet/fsusb42-d.pdf.
(2) FSUSB42UMX onsemi / Fairchild | Mouser. https://www.mouser.com/ProductDetail/onsemi-Fairchild/FSUSB42UMX?qs=sGAEpiMZZMvBkyoBWg7iSgODnfuVC4Rm.
(3) FSUSB42UMX onsemi | Integrated Circuits (ICs) | DigiKey. https://www.digikey.com/en/products/detail/onsemi/FSUSB42UMX/1642609.
Wolfchip Electronics Limited | https://www.wolfchip.com/blog/how-do-i-protect-the-fsusb42umx-from-overcurrent-conditions-42000365.html