Microchip USB2514B：低功耗高性能USB Hub控制器

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"USB2514B数据手册详细介绍了Microchip公司推出的一款高性能、低功耗的USB 2.0集线器控制器芯片系列。该系列包含2514B、2514x等型号，旨在为嵌入式USB解决方案提供配置灵活且功能强大的hub。产品特点包括： 1. 接口支持：USB2514B系列最多支持2到4个下游端口（downstream ports），兼容USB 2.0标准，支持低速、全速以及在作为高速hub时的高速设备连接。 2. 配置选项：为了满足不同OEM厂商的需求，提供了单个串行I2C EEPROM或SMBus从端口的增强型配置选项，允许用户定制功能。 3. MultiTRAK技术：这是该芯片的一个重要特性，它实现了每个端口独立的交易翻译器，提高了数据传输的性能。 4. 端口映射与序列控制：提供了灵活的端口映射功能，并允许用户选择性地禁用或启用特定端口，增强了设计的灵活性。 5. 端口交换（Port Swap）：通过编程，可以改变USB差分对引脚在PCB上的位置，便于信号线直接连接到插座，简化设计过程。 6. PHYBoost（物理层增强）：该功能是可编程的，能优化USB信号的处理，提升数据传输的稳定性和效率。 USB2514B是一款适合于嵌入式系统应用的高效能、小型化的USB集线器控制器，其丰富的功能和可定制性使其在低成本、低功耗的环境中表现出色，是现代电子设计中USB连接管理的理想选择。"

USB251xB/xBi

DS00001692C-page 10  2010 - 2015 Microchip Technology Inc.

3.2 Pin List (Alphabetical)

TABLE 3-1: USB251XB/XBI PIN LIST (ALPHABETICAL)

Symbol Name

Pin Numbers

USB2512B

USB2512Bi

USB2513B

USB2513Bi

USB2514B

USB2514Bi

BC_EN1 Battery Charging

Strap Option

BC_EN2 16

BC_EN3 -18

BC_EN4 -20

CFG_SEL0 Configuration

Programming

Selection

CFG_SEL1 25

CLKIN External Clock Input 33

CRFILT Core Regulator Filter

Capacitor

Ground Pad

(VSS)

Exposed Pad Tied to

Ground (VSS)

ePad

HS_IND Hi-Speed Upstream

Port Indicator

LOCAL_PWR Local Power

Detection

NC No Connect 6 -

NC 7-

NC 18 -

NC 19 -

NC 8-

NC 9-

NC 20 -

NC 21 -

NON_REM0 Non-Removable

Port Strap Option

NON_REM1 22

OCS_N1 Over-Current Sense 13

OCS_N2 17

OCS_N3 -19

OCS_N4 -21

PLLFILT PLL Regulator Filter

Capacitor

PRT_DIS_M1 Downstream Port

Disable Strap Option

PRT_DIS_M2 3

PRT_DIS_M3 -6

PRT_DIS_M4 -8

PRT_DIS_P1 Port Disable 2

PRT_DIS_P2 4

PRT_DIS_P3 -7

PRT_DIS_P4 -9

USB251xB/xBi

DS00001692C-page 12  2010 - 2015 Microchip Technology Inc.

3.3 Pin Descriptions (Grouped by Function)

An N at the end of a signal name indicates that the active (asserted) state occurs when the signal is at a low voltage

level. When the N is not present, the signal is asserted when it is at a high voltage level. The terms assertion and nega-

tion are used exclusively in order to avoid confusion when working with a mixture of active low and active high signals.

The term assert, or assertion, indicates that a signal is active, independent of whether that level is represented by a high

or low voltage. The term negate, or negation, indicates that a signal is inactive.

TABLE 3-2: USB251XB/XBI PIN DESCRIPTIONS

Symbol

Buffer

Type

Description

UPSTREAM USB 2.0 INTERFACES

USBDM_UP

USBDP_UP

IO-U USB Data: connect to the upstream USB bus data signals (host, port, or upstream

hub).

VBUS_DET I Detect Upstream VBUS Power: detects the state of the upstream VBUS power.

The hub monitors VBUS_DET to determine when to assert the internal D+ pull-up

resistor: (signaling a connect event).

When designing a detachable hub, this pin should be connected to VBUS on the

upstream port via a 2:1 voltage divider. Two 100 k

 resistors are suggested.

For self-powered applications with a permanently attached host, this pin must be

connected to a dedicated host control output, or connected to the 3.3 V domain

that powers the host (typically VDD33).

DOWNSTREAM USB 2.0 INTERFACES

USBDP_DN[x:1]/P

RT_DIS_P[x:1]

IO-U Hi-Speed USB Data: connect to the downstream USB peripheral devices attached

to the hub’s port. To disable, use a 10 k

 pull-up resistor to 3.3 V.

USBDM_DN[x:1]/P

RT_DIS_M[x:1]

Downstream Port Disable Strap Option: when enabled by package and

configuration settings (see Table 5-1 on page 19), this pin is sampled at RESET_N

negation to determine if the port is disabled.

To disable a port, pull up both PRT_DIS_M[x:1] and PRT_DIS_P[x:1] pins for the

corresponding port number(s). See Section 3.3.1, on page 14 for pull up details.

PRTPWR[x:1]/ O12 USB Power Enable: enables power to USB peripheral devices downstream.

BC_EN[x:1] IPD Battery Charging Strap Option: when enabled by package and configuration

settings (see Table 5-1), the pin will be sampled at RESET_N negation to

determine if ports [x:1] support the battery charging protocol. When supporting the

battery charging protocol, the hub also supports external port power controllers.

The battery charging protocol enables a device to draw the currents per the USB

battery charging specification. See Section 3.3.1, on page 14 for strap pin details.

1 : Battery charging feature is supported for port x

0 : Battery charging feature is not supported for port x

OCS_N[x:1] IPU Over-Current Sense: input from external current monitor indicating an over-current

condition.

RBIAS I-R USB Transceiver Bias: a 12.0 k

 (+/- 1%) resistor is attached from ground to this

pin to set the transceiver’s internal bias settings.

剩余56页未读，继续阅读

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