LPC1311 datasheet(49/60 Pages) NXP

49 / 60 page

LPC1311_13_42_43_2

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Product data sheet

Rev. 02 — 6 May 2010

49 of 60

NXP Semiconductors

LPC1311/13/42/43

32-bit ARM Cortex-M3 microcontroller

11. Application information

11.1 Suggested USB interface solutions (LPC1342/43 only)

11.2 XTAL input

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 26. LPC1342/43 USB interface on a self-powered device

LPC134x

USB-B

connector

USB_DP

USB_CONNECT

soft-connect switch

USB_DM

USB_VBUS

VSS

VDD

1.5 k

RS = 33 Ω

002aae608

RS = 33 Ω

Fig 27. LPC1342/43 USB interface on a bus-powered device

LPC134x

VDD

1.5 k

002aae609

USB-B

connector

USB_DP

USB_DM

USB_VBUS

VSS

RS = 33 Ω

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