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| 型号： | OM13032,598 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 48/74页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LPC11U24 |
| 标准包装： | 1 |
| 类型： | MCU |
| 适用于相关产品： | LPC11U24 |
| 所含物品： | 板 |
| 其它名称： | 568-8599 |
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LPC11U2X
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 2.2 — 11 March 2014
52 of 74
NXP Semiconductors
LPC11U2x
32-bit ARM Cortex-M0 microcontroller
11. Application information
11.1 Suggested USB interface solutions
The USB device can be connected to the USB as self-powered device (see Figure 27) or
bus-powered device (see Figure 28).
On the LPC11U2x, the PIO0_3/USB_VBUS pin is 5 V tolerant only when VDD is applied
and at operating voltage level. Therefore, if the USB_VBUS function is connected to the
USB connector and the device is self-powered, the USB_VBUS pin must be protected for
situations when VDD = 0 V.
If VDD is always greater than 0 V while VBUS = 5 V, the USB_VBUS pin can be connected
directly to the VBUS pin on the USB connector.
For systems where VDD can be 0 V and VBUS is directly applied to the VBUS pin,
precautions must be taken to reduce the voltage to below 3.6 V, which is the maximum
allowable voltage on the USB_VBUS pin in this case.
One method is to use a voltage divider to connect the USB_VBUS pin to the VBUS on the
USB connector. The voltage divider ratio should be such that the USB_VBUS pin will be
greater than 0.7VDD to indicate a logic HIGH while below the 3.6 V allowable maximum
voltage.
For the following operating conditions
VBUSmax = 5.25 V
VDD = 3.6 V,
the voltage divider should provide a reduction of 3.6 V/5.25 V or ~0.686 V.
Fig 27. USB interface on a self-powered device where USB_VBUS = 5 V
LPC1xxx
USB-B
connector
USB_DP
USB_CONNECT
soft-connect switch
USB_DM
USB_VBUS
VSS
VDD
R1
1.5 kΩ
RS = 33 Ω
aaa-010178
RS = 33 Ω
R2
R3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| OM13033 | 制造商:NXP Semiconductors 功能描述:EVAL ARM NGX LPC11U24 制造商:NXP Semiconductors 功能描述:LPC11U24, NGX, KEIL, EVAL BOARD 制造商:NXP Semiconductors 功能描述:LPC11U24, NGX, KEIL, EVAL BOARD; Silicon Manufacturer:NXP; Core Architecture:ARM; Core Sub-Architecture:Cortex-M0; Silicon Core Number:LPC11xxx; Silicon Family Name:LPC11Uxx; Features:Evaluation Board for LPC11U24 Microcontroller; ;RoHS Compliant: Yes |
| OM13033,598 | 功能描述:开发板和工具包 - ARM NGX LPC11U24 Eval Board RoHS:否 制造商:Arduino 产品:Development Boards 工具用于评估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口类型:DAC, ICSP, JTAG, UART, USB 工作电源电压:3.3 V |
| OM13033598 | 制造商:NXP Semiconductors 功能描述:EVAL ARM NGX LPC11U24 |
| OM13034,598 | 制造商:NXP Semiconductors 功能描述:EVAL, IAR, LPC1347, J-LINK LITE 制造商:NXP Semiconductors 功能描述:EVAL, IAR, LPC1347, J-LINK LITE, Silicon Manufacturer:NXP, Core Architecture:ARM 制造商:NXP Semiconductors 功能描述:EVAL, IAR, LPC1347, J-LINK LITE, Silicon Manufacturer:NXP, Core Architecture:ARM, Core Sub-Architecture:Cortex-M3, Silicon Core Number:LPC1347, Silicon Family Name:LPC1300, Kit Contents:Evaluation Board for LPC1347 , RoHS Compliant: Yes |
| OM13034598 | 制造商:NXP Semiconductors 功能描述:EVAL IAR LPC1347 J-LINK LITE |
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