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USB2513I Datasheet(PDF) 4 Page - Microchip Technology |
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USB2513I Datasheet(HTML) 4 Page - Microchip Technology |
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4 / 57 page  USB251xB/xBi DS00001692C-page 4 2010 - 2015 Microchip Technology Inc. 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: • MultiTRAKTM 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 I2C EEPROM or a microcontrol- ler as an SMBus slave device. When the hub is configured by an I2C 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. |
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Similar Description - USB2513I |
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