USB2534D

The Microchip USB2534D is a low-power, OEM configurable, MTT (Multi-Transaction Translator) USB 2.0 hub controller with four downstream ports and advanced features for Intel Thunderbolt and automotive/industrial USB applications. The difference between the two versions (commercial and automotive/industrial) lies in the FlexConnect implementation. The commercial version only supports switching between host ports while the automotive/industrial version supports swapping of host and device functionality. The USB2534D is fully compliant with the USB 2.0 Specification, USB 2.0 Link Power Management Addendum and will attach to an upstream port as a Full-Speed hub or as a Full-/Hi-Speed hub. The 4-port hub supports Low-Speed, Full-Speed, and Hi-Speed (if operating as a Hi-Speed hub) downstream devices on all of the enabled downstream ports.

The USB2534D has been specifically optimized for embedded systems where high performance and minimal BOM costs are critical design requirements. Standby mode power has been minimized, and reference clock inputs can be aligned to the customer’s specific application. Additionally, all required resistors on the USB ports are integrated into the hub, including all series termination and pull-up/pulldown resistors on the D+ and D– pins.

The USB2534D supports both upstream battery charger detection and downstream battery charging. The USB2534D integrated battery charger detection circuitry supports the USB-IF Battery Charging (BC1.2) detection method and most Apple® devices. These circuits are used to detect the attachment and type of a USB charger and provide an interrupt output to indicate charger information is available to be read from the device’s status registers via the serial interface. The USB2534D provides the battery charging handshake and supports the following USB-IF BC1.2 charging profiles:

* DCP: Dedicated Charging Port (Power brick with no data) * CDP: Charging Downstream Port (1.5A with data) * SDP: Standard Downstream Port (0.5A with data) * Custom profiles loaded via SMBus or OTP The USB2534D provides an additional USB endpoint dedicated for use as a USB to I²C interface, allowing external circuits or devices to be monitored, controlled, or configured via the USB interface.

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