4.0 Power Connections ....................................................................................................................................................................... 17
5.0 Modes of Operation ...................................................................................................................................................................... 18
Appendix A: Data sheet Revision History ........................................................................................................................................... 40
The Microchip Web Site ...................................................................................................................................................................... 41
Customer Change Notification Service ............................................................................................................................................... 41
Customer Support ............................................................................................................................................................................... 41
Product Identification System ............................................................................................................................................................. 42
2012 - 2019 Microchip Technology Inc.
DS00001713B-page 3
USB2534
1.0
INTRODUCTION
The USB2534 is a low-power, OEM configurable, MTT (Multi-Transaction Translator) USB 2.0 hub controller with 4
downstream ports and advanced features for embedded USB applications. The USB2534 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 USB2534 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/pull-down resistors on the D+ and D– pins.
The USB2534 supports both upstream battery charger detection and downstream battery charging. The USB2534 inte-
grated 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 USB2534 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 USB2534 provides an additional USB endpoint dedicated for use as a USB to I
2
C interface, allowing external cir-
cuits or devices to be monitored, controlled, or configured via the USB interface. Additionally, the USB2534 includes
many powerful and unique features such as:
FlexConnect,
which provides flexible connectivity options. The USB2534’s downstream port 1 can be swapped with
the upstream port, allowing master capable devices to control other devices on the hub.
MultiTRAK
™
Technology,
which utilizes a dedicated Transaction Translator (TT) per port to maintain consistent full-
speed data throughput regardless of the number of active downstream connections. MultiTRAK
TM
outperforms conven-
tional USB 2.0 hubs with a single TT in USB full-speed data transfers.
PortMap,
which provides flexible port mapping and disable sequences. The downstream ports of a USB2534 hub can
be reordered or disabled in any sequence to support multiple platform designs with minimum effort. For any port that is
disabled, the USB2534 hub controllers automatically reorder the remaining ports to match the USB host controller’s port
numbering scheme.
PortSwap,
which adds per-port programmability to USB differential-pair pin locations. PortSwap allows direct alignment
of USB signals (D+/D-) to connectors to avoid uneven trace length or crossing of the USB differential signals on the
PCB.
PHYBoost,
which provides programmable levels of Hi-Speed USB signal drive
strength in the downstream port transceivers. PHYBoost attempts to restore USB sig-
nal integrity in a compromised system environment. The graphic on the right shows
an example of Hi-Speed USB eye diagrams before and after PHYBoost signal integ-
rity restoration.
VariSense,
which controls the USB receiver sensitivity enabling programmable lev-
els of USB signal receive sensitivity. This capability allows operation in a sub-optimal
system environment, such as when a captive USB cable is used.
The USB2534 is available in commercial (0°C to +70°C) and industrial (-40°C to +85°C) temperature range versions.
DS00001713B-page 4
2012 - 2019 Microchip Technology Inc.
USB2534
1.1
Block Diagram
SYSTEM BLOCK DIAGRAM
Figure 1-1
details the internal block diagram of the USB2534.
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