LPC2142 datasheet(36/45 Pages) NXP

Part #	LPC2142

Description	Single-chip 16-bit/32-bit ocontrollers; up to 512 kB flash with ISP/IAP, USB 2.0 full-speed device, 10-bit ADC and DAC

PDF	45 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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36 / 45 page

LPC2141_42_44_46_48

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Product data sheet

Rev. 5 — 12 August 2011

36 of 45

NXP Semiconductors

LPC2141/42/44/46/48

Single-chip 16-bit/32-bit microcontrollers

12. Application information

12.1 Suggested USB interface solutions

12.2 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 10. LPC2141/42/44/46/48 USB interface using the CONNECT function on pin 17

LPC2141/42/

44/46/48

USB-B

connector

CONNECT

soft-connect switch

−

VBUS

VSS

VDD

1.5 k

RS = 33 Ω

002aab563

RS = 33 Ω

Fig 11. LPC2141/42/44/46/48 USB interface using the UP_LED function on pin 17

LPC2141/42/

44/46/48

VDD

1.5 k

UP_LED

002aab562

USB-B

connector

−

VBUS

VSS

RS = 33 Ω

LPC2142 Datasheet(PDF) 36 Page - NXP Semiconductors

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