LPC4088 datasheet(104/123 Pages) NXP

104 / 123 page

LPC408X_7X

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Objective data sheet

Rev. 1 — 17 September 2012

104 of 123

NXP Semiconductors

LPC408x/7x

32-bit ARM Cortex-M4 microcontroller

13.2 Crystal oscillator XTAL input and component selection

The input voltage to the on-chip oscillators is limited to 1.8 V. If the oscillator is driven by a

clock in slave mode, it is recommended that the input be coupled through a capacitor with

Ci = 100 pF. To limit the input voltage to the specified range, choose an additional

capacitor to ground Cg which attenuates the input voltage by a factor Ci/(Ci + Cg). In slave

mode, a minimum of 200 mV(RMS) is needed.

Fig 36. USB device port configuration: port 1 host and port 2 device

USB_UP_LED1

USB_D+1

USB_D-1

USB_PWRD1

15 kΩ

LPC408x/7x

USB-A

connector

USB-B

connector

33 Ω

002aah272

VDD

USB_UP_LED2

USB_CONNECT2

VDD

USB_OVRCR1

USB_PPWR1

LM3526-L

ENA

5 V

FLAGA

OUTA

VDD

D+

D-

D+

D-

VBUS

USB_D+2

USB_D-2

VBUS

VSSIO,

VSSCORE

VSSIO,

VSSCORE

Fig 37. Slave mode operation of the on-chip oscillator

LPC40xx

XTAL1

100 pF

002aah273

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