MAX3421EEHJ+

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The MAX3421E Two-Port USB Peripheral/Host Controller with SPI Interface is a USB peripheral-only controller with a SPI interface that allows easy integration of USB ports into embedded systems designs. With two full-speed ports and two high-speed ports, it provides ample bandwidth for both USB peripheral devices and high-throughput applications. The two ports are independently controlled, and the controller supports device operation on each port, as well as host operation for each port.

The MAX3421E is well-suited for applications such as industrial control and medical equipment, where a small form factor, wide temperature range, robust ESD protection, and a fully integrated solution are desired. The MAX3421E also features support for USB 20 power switches and integrated power monitoring.

The MAX3421E can operate as a host (for example, on a laptop) or as a USB device (such as a keyboard), and can switch between the two roles when necessary. As a host, the MAX3421E provides support for up to 127 USB peripherals, including hubs and USB 2.0 devices. When operating as a USB device, the MAX3421E will negotiate with the host to determine the highest speed the device will be able to support. The configuration of the USB ports is controlled via an SPI interface.

The application field and working principle of the MAX3421EEHJ + can be seen in the following. The MAX3421EEHJ + is a versatile USB solution designed to provide a low-cost way to quickly connect peripheral devices and legacy peripherals to a host computer. The MAX3421EEHJ + is an advanced USB hub controller that supports both low- and full-speed USB, multiple ports, and power switching for powering connected devices. The MAX3421EEHJ+ is based on the popular MAX3420E+ USB-to-serial bridge controller, which has three primary functions: host-to-host bridging, port connecting, and device interface. The MAX3421EEHJ + works with the MAX3354E Universal Serial Bus (USB) port selector switch to provide multiple port connections to external devices. It provides both low speed (1.5 Mbps) and full speed (12 Mbps) support for two USB ports and two/four high speed (480 Mbps) ports. The MAX3421EEHJ+ is IEEE 802.11 compliant and supports low-power suspend/resume and remote wake-up, which makes it an ideal solution for USB reprogramming. In the device interface mode, the MAX3421EEHJ+ can serve as a hub controller, allowing the host to use multiple USB ports instead of a single port. For example, a user could connect a USB thumb drive and a USB printer to a laptop computer instead of just one or the other.

In addition, the MAX3421EEHJ+ can also provide USB peripheral support. In this mode, the MAX3421EEHJ+ is used to bridge two USB host controllers. The peripheral controller is able to detect and control the connection and disconnection of USB devices connected to one of the host controllers, and can adapt the rate of transfer based on the Sircuit’s demand. The MAX3421EEHJ+ can also monitor the power usage and current status of each of the two connected host controllers, and make power management decisions if the current consumed by the host controller is outside the safe limits.

For more complex applications, the MAX3421EEHJ+ can also function as a USB selector switch. A selector switch can be used to connect a set of USB ports to one of many device ports. For example, a user could plug a USB phone into one port and a USB mouse into another port, and switch between the two connected devices with the MAX3421EEHJ+ selector switch. This feature is especially useful in applications that require multiple USB cables to be connected and disconnected simultaneously. The MAX3421EEHJ+ also supports the standard USB serial port protocol, allowing it to act as an interface between multiple serial devices.

The MAX3421EEHJ+ application field and working principle demonstrate how a cost-efficient USB solution can be used for a broad range of applications. With its support for multiple port selections, power monitoring and USB peripherals, the MAX3421EEHJ+ allows users to quickly and easily integrate USB technology into their designs. In addition, the MAX3421EEHJ+ offers an integrated solution for USB interoperability, making it a versatile USB solution for many embedded system designs.

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