LPC11U35FET48 datasheet(54/76 Pages) NXP

Part #	LPC11U35FET48

Description	32-bit ARM Cortex-M0 microcontroller up to 128 kB flash up to 12 kB SRAM and 4 kB EEPROM USB device USART

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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54 / 76 page

LPC11U3X

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Product data sheet

Rev. 2 — 25 November 2013

54 of 76

NXP Semiconductors

LPC11U3x

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 LPC11U3x, 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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LPC11U35FET48 Datasheet(PDF) 54 Page - NXP Semiconductors

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