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首页Microchip USB2514B:低功耗高性能USB Hub控制器
"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。"
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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
12
BC_EN2 16
BC_EN3 -18
BC_EN4 -20
CFG_SEL0 Configuration
Programming
Selection
24
CFG_SEL1 25
CLKIN External Clock Input 33
CRFILT Core Regulator Filter
Capacitor
14
Ground Pad
(VSS)
Exposed Pad Tied to
Ground (VSS)
ePad
HS_IND Hi-Speed Upstream
Port Indicator
25
LOCAL_PWR Local Power
Detection
28
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
28
NON_REM1 22
OCS_N1 Over-Current Sense 13
OCS_N2 17
OCS_N3 -19
OCS_N4 -21
PLLFILT PLL Regulator Filter
Capacitor
34
PRT_DIS_M1 Downstream Port
Disable Strap Option
1
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
![](https://csdnimg.cn/release/download_crawler_static/43006012/bgb.jpg)
2010 - 2015 Microchip Technology Inc. DS00001692C-page 11
USB251xB/xBi
PRTPWR1 USB Port Power
Enable
12
PRTPWR2 16
PRTPWR3 -18
PRTPWR4 -20
RBIAS USB Transceiver
Bias
35
RESET_N Reset Input 26
SCL Serial Clock 24
SDA Serial Data Signal 22
SMBCLK System
Management Bus
Clock
24
SMBDATA System
Management Bus
Data Signal
22
SUSP_IND Active/Suspend
Status Indicator
28
TEST Test Pin 11
USBDM_UP USB Bus Data 30
USBDP_UP 31
USBDM_DN1 Hi-Speed USB Data 1
USBDM_DN2 3
USBDM_DN3 -6
USBDM_DN4 -8
USBDP_DN1 2
USBDP_DN2 4
USBDP_DN3 -7
USBDP_DN4 -9
VBUS_DET Upstream VBUS
Power Detection
27
VDD33 3.3 V Digital Power 15
VDD33 23
VDDA33 3.3 V Analog Power 5
VDDA33 10
VDDA33 29
VDDA33 36
XTALIN Crystal Input 33
XTALOUT Crystal Output 32
TABLE 3-1: USB251XB/XBI PIN LIST (ALPHABETICAL) (CONTINUED)
Symbol Name
Pin Numbers
USB2512B
USB2512Bi
USB2513B
USB2513Bi
USB2514B
USB2514Bi
![](https://csdnimg.cn/release/download_crawler_static/43006012/bgc.jpg)
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.
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