8.0 DC Parameters ............................................................................................................................................................................. 39
9.0 AC Specifications .......................................................................................................................................................................... 44
Appendix A: Data Sheet Revision History ........................................................................................................................................... 47
The Microchip Web Site ...................................................................................................................................................................... 49
Customer Change Notification Service ............................................................................................................................................... 49
Customer Support ............................................................................................................................................................................... 49
Product Identification System ............................................................................................................................................................. 50
2014 Microchip Technology Inc.
60001234B-page 3
USB82514
1.0
INTRODUCTION
The Microchip Automotive Grade USB 2.0 4-Port Hub is a low-power, OEM configurable, MTT (Multi- Transaction Trans-
lator) hub controller IC with 4 downstream ports for embedded USB solutions. It is designed, fabricated, tested, charac-
terized and qualified for automotive applications. The 4-port hub is fully compliant with the USB 2.0 Specification. The
USB82514 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.
All required resistors on the USB ports are integrated into the hub. This includes all series termination resistors on D+
and D- pins and all required pull-down and pull-up resistors on D+ and D- pins. The over-current sense inputs for the
downstream facing ports have internal pull-up resistors.
The USB82514 includes over 30 programmable features including:
MultiTRAK™ Technology
which utilizes a dedicated TT per port to maintain consistent full-speed data throughput
regardless of the number of active downstream connections. MultiTRAK outperforms conventional USB 2.0 hubs with
a single TT in USB full-speed data transfers.
PortMap
which provides flexible port mapping and disable sequences. The down-
stream ports of a USB82514 hub can be reordered or disabled in any sequence to
support multiple platform designs with minimum effort. For any port that is disabled,
the USB82514 automatically reorders the remaining ports to match the USB host
controller’s port numbering scheme.
PortSwap
which adds per-port programmability to USB differential-pair pin loca-
tions. PortSwap allows direct alignment of USB signals (D+/D-) to connectors avoid-
ing uneven trace length or crossing of the USB differential signals on the PCB.
PHYBoost
which enables four programmable levels of USB signal drive strength in
downstream port transceivers. PHYBoost attempts to restore USB signal integrity
that has been compromised by system level variables such as poor PCB layout, long
cables, etc. The boost graphic shows an example of hi-speed USB eye diagrams
before (PHYBoost at 0%) and after (PHYBoost at 12%) signal integrity restoration in
a compromised system environment.
The USB82514 is specifically tailored for use in automotive applications requiring
automotive grade robustness starting with the comprehension of proprietary design for reliability techniques within the
silicon IC itself as well as for the package design. Automotive qualified technologies and processes are used to fabricate
the products with enhanced monitors to continuously drive improvements in accordance with our zero-dpm methodol-
ogy. Product qualification is focused on customer expectations and exceeds many of the automotive reliability standards
including AEC-Q100.
Microchip automotive services are provided during the life of the product from a dedicated organization composed of
operations, quality, and product support personnel specialized in meeting the requirements of the automotive customer.
L1
L2
L3
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Card Reader
60001234B-page 4
2014 Microchip Technology Inc.
USB82514
1.1
OEM Selectable Features
A default configuration is available in the USB82514 following a reset. This configuration may be sufficient for some
applications. Strapping option pins make it possible to modify a limited sub-set of the configuration options.
The USB82514 may also be configured by an external EEPROM or a microcontroller. When using the microcontroller
interface, the hub appears as an SMBus slave device. If the hub is pin-strapped for external EEPROM configuration but
no external EEPROM is present, then a value of ‘0’ will be written to all configuration data bit fields (the hub will attach
to the host with all ‘0’ values).
The USB82514 supports several OEM selectable features:
• Optional OEM configuration via I
2
C EEPROM or via the industry standard SMBus interface from an external
SMBus host or microcontroller, see
Table 7-1, "Hub Configuration Options"
to configure the serial port interface
behavior via the CFG_SEL1 and CFG_SEL0 pins.
• Compound device support (port is permanently hardwired to a downstream USB peripheral device), on a port-by-
port basis, see
"Register 07h: Configuration Data Byte 2",
bit COMPOUND.
• Select Single-Transaction Translator (STT) or Multi-Transaction Translator (MTT), see
"Register 06h: Configura-
tion Data Byte 1",
bit MTT_ENABLE.
• Select over-current sensing and port power control on an individual (port-by-port) or ganged (all ports together)
basis to match the OEM’s choice of circuit board component selection, see
"Register 06h: Configuration Data Byte
1",
bits CURRENT_SNS and PORT_PWR.
• Customize vendor ID, product ID, and device ID, see
"Register 00h: Vendor ID (LSB)", "Register 01h: Vendor ID
(MSB)", "Register 02h: Product ID (LSB)", "Register 03h: Product ID (MSB)", "Register 04h: Device ID (LSB)"
and
"Register 05h: Device ID (MSB)".
• Easily configure as a 2, 3 or 4-Port Hub in common PCB layout, see
"Register 0Ah: Port Disable for Self-Powered
Operation"
and
"Register 0Bh: Port Disable for Bus-Powered Operation".
• PortMap: Flexible port mapping and disable sequence. Ports can be disabled/reordered in any sequence to sup-
port multiple platforms with a single design. The hub will automatically reorder the remaining ports to match the
host controller's numbering scheme, see
"Register FBh: PortMap 12"
and
"Register FCh: PortMap 34".
• PortSwap: Programmable USB differential-pair pin location.
- Eases PCB layout by aligning USB signal lines directly to connectors, see
"Register FAh: PortSwap".
• PhyBoost: Programmable USB signal drive strength. Recover USB signal integrity due to compromised system
environments using 4 levels of signal drive strength, see
"Register F6h: Boost_Up"
and
"Register F8h: Boost_4:0".
• Configure the delay time for filtering the over-current sense inputs, see
"Register 07h: Configuration Data Byte 2",
bit OC_TIMER.
• Configure the downstream port power-on time reported to the host, see
"Register 10h: Power-On Time".
• Indicate the maximum current that the 4-port hub consumes from the USB upstream port, see
"Register 0Eh: Hub
Controller Max Current for Self-Powered Operation"
and
"Register 0Fh: Hub Controller Max Current for Bus-Pow-
ered Operation".
• Indicate the maximum current required for the hub controller, see
"Register 0Ch: Max Power for Self-Powered
Operation"
and
"Register 0Dh: Max Power for Bus-Powered Operation".
• Support custom string descriptor up to 31 characters in length for:
- Manufacturer string, see
"Register 16h-53h: Manufacturer String".
- Product string, see
"Register 54h-91h: Product String".
- Serial number string, see
"Register 92h-CFh: Serial String".
• Pin selectable options for default configuration:
- Downstream ports as non-removable ports, see
"Register 09h: Non-Removable Device".
- Downstream ports as disabled ports, see
"Register 0Ah: Port Disable for Self-Powered Operation"
and
"Reg-
ister 0Bh: Port Disable for Bus-Powered Operation".
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