3.0 Pin Information ................................................................................................................................................................................ 7
4.0 Battery Charging Support ............................................................................................................................................................. 17
6.0 DC Parameters ............................................................................................................................................................................. 39
7.0 AC Specifications .......................................................................................................................................................................... 44
8.0 Package Marking Information ....................................................................................................................................................... 46
9.0 Package Information ..................................................................................................................................................................... 48
Appendix C: Data Sheet Revision History .......................................................................................................................................... 52
The Microchip Web Site ...................................................................................................................................................................... 54
Customer Change Notification Service ............................................................................................................................................... 54
Customer Support ............................................................................................................................................................................... 54
Product Identification System ............................................................................................................................................................. 55
2010 - 2015 Microchip Technology Inc.
DS00001692C-page 3
USB251xB/xBi
1.0
INTRODUCTION
The Microchip USB251xB/xBi hub family is a group of low-power, configurable, MTT (multi transaction translator) hub
controller ICs. The hub provides downstream ports for embedded USB solutions and is fully compliant with the
USB 2.0
Specification
[1]. Each of the hub controllers can attach to an upstream port as a full-speed or full-/hi-speed hub. The
hub can support low-speed, full-speed, and hi-speed downstream devices when operating as a hi-speed hub.
All required resistors on the USB ports are integrated into the hub. This includes all series termination resistors 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 USB251xB/xBi hub family includes programmable features, such as:
•
MultiTRAK
TM
Technology:
implements a dedicated Transaction Translator (TT) for each port. Dedicated TTs help
maintain consistent full-speed data throughput regardless of the number of active downstream connections.
•
PortMap:
provides flexible port mapping and disable sequences. The downstream ports of a USB251xB/xBi hub
can be reordered or disabled in any sequence to support multiple platform designs with minimum effort. For any
port that is disabled, the USB251xB/xBi hub controller automatically reorders the remaining ports to match the
USB host controller’s port numbering scheme.
•
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:
enables 4 programmable levels of USB signal drive strength in downstream port transceivers. PHY-
Boost will also attempt to restore USB signal integrity.
1.1
Configurable Features
The USB251xB/xBi hub controller provides a default configuration that may be sufficient for most applications. Strapping
option pins (see
Section 3.3.1 on page 14)
provide additional features to enhance the default configuration. When the
hub is initialized in the default configuration, the following features may be configured using the strapping options:
•
•
•
•
Downstream non-removable ports, where the hub will automatically report as a compound device
Downstream disabled ports
Enabling of battery charging option on individual ports
The USB251xB/xBi hub controllers can alternatively be configured by an external I
2
C EEPROM or a microcontrol-
ler as an SMBus slave device. When the hub is configured by an I
2
C EEPROM or over SMBus, the following con-
figurable features are provided:
Support for compound devices on a port-by-port basis
Selectable over-current sensing and port power control on an individual or ganged basis to match the circuit board
component selection
Customizable vendor ID, product ID, and device ID
Configurable USB signal drive strength
Configurable USB differential pair pin location
Configurable delay time for filtering the over-current sense inputs
Configurable downstream port power-on time reported to the host
Indication of the maximum current that the hub consumes from the USB upstream port
Indication of the maximum current required for the hub controller
Custom string descriptors (up to 31 characters):
- Product
- Manufacturer
- Serial number
Battery charging USB251xB/xBi products are fully footprint compatible with USB251x/xi/xA/xAi products:
- Pin-compatible
- Direct drop-in replacement
- Use the same PCB components
- USB-IF Compliance by Similarity for ease of use and a complete cost reduction solution
- Product IDs, device IDs, and other register defaults may differ. See
Section 5.1 on page 19
for details.
•
•
•
•
•
•
•
•
•
•
•
DS00001692C-page 4
2010 - 2015 Microchip Technology Inc.
USB251xB/xBi
TABLE 1-1:
Part
Number
USB2512
USB2512i
USB2512A
USB2512Ai
USB2513
USB2513i
USB2514
USB2514i
SUMMARY OF COMPATIBILITIES BETWEEN USB251XB/XBI AND
USB251X/XI/XA/XAI PRODUCTS
Drop-in Replacement
USB2512B
USB2512Bi
USB2512B
USB2512Bi
USB2513B
USB2513Bi
USB2514B
USB2514Bi
Conventions
Within this manual, the following abbreviations and symbols are used to improve readability.
Example
BIT
FIELD.BIT
Description
Name of a single bit within a field
Name of a single bit (BIT) in FIELD
Range from x to y, inclusive
Groups of bits from m to n, inclusive
Pin Name
Binary number (value zzzz)
Hexadecimal number (value zzz)
Hexadecimal number (value zz)
Reserved memory location. Must write 0, read value indeterminate
Instruction code, or API function or parameter
Section or Document name
Don’t care
<> indicate a Parameter is optional or is only used under some conditions
Braces indicate Parameter(s) that repeat one or more times
Brackets indicate a nested Parameter. This Parameter is not real and actually
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