Intended UseΒΆ

Note

Do not use the USB-SD-Mux for any other use cases than the ones listed below:

  • The USB-SD-Mux is intended to be used during the development of embedded devices with a micro SD card slot.

  • The USB-SD-Mux is intended to switch a micro SD card between a host computer and an embedded device.

  • The USB-SD-Mux must be handled in an ESD-safe environment to prevent damage to the device, the embedded target and the host computer.

Warning

The USB-SD-Mux may be damaged if it is not handled in an ESD-safe environment.

  • The USB-SD-Mux Classic is intended to work with Micro SD-Cards with a speed up to 50 MHz.

  • The USB-SD-Mux FAST is intended to work with Micro SD-Cards up to and including the speed class UHS-I. Cards and devices with a higher speed class should automatically fall back to UHS-I speeds.

  • The USB-SD-Mux is intended to work with Micro SD-Cards with a voltage of 3.3 V and 1.8 V.

Warning

The voltage on the SD card slot must not be higher than 3.3V, otherwise the product may be damaged.

Make sure your prototypes respect these limits, especially when the voltage has not been checked finally or can be set by software.

  • The USB-SD-Mux Classic is intended to be used with a Micro USB-Cable not longer than 1.8 m.

  • The USB-SD-Mux FAST is intended to be used with a USB-C-Cable not longer than 1.8 m.

Note

In most environments the USB-SD-Mux creates an additional ground loop in the electrical environment. This can lead do unpredictable results. Use an USB-isolator to power the USB-SD-Mux in such cases.

  • The USB-SD-Mux is intended to be directly inserted into the SD card slot of a DUT.

Important

Do not use Micro-SD extension cables. Those may lead to unpredictable system behavior and may result in problems with EMI.

  • The USB-SD-Mux is intended to be controlled by a host computer running Linux. The usbsdmux control software uses low-level Linux APIs that are not available on other operating Systems.