lpc11u12 NXP Semiconductors, lpc11u12 Datasheet - Page 52

• Manufacturer Part Number: lpc11u12
• Description: 32-bit Arm Cortex-m0 Microcontroller; Up To 32 Kb Flash; 6 Kb Sram; Usb Device; Usart
• Manufacturer: NXP Semiconductors

NXP Semiconductors
11. Application information
LPC11U1X
Product data sheet
Fig 25. USB interface on a self-powered device
Fig 26. USB interface on a bus-powered device
11.1 Suggested USB interface solutions
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
C
capacitor to ground C
mode, a minimum of 200 mV(RMS) is needed.
i
= 100 pF. To limit the input voltage to the specified range, choose an additional
LPC11Uxx
LPC11Uxx
All information provided in this document is subject to legal disclaimers.
USB_CONNECT
V
USB_VBUS
USB_DP
USB_DM
V
V
USB_VBUS
USB_DP
USB_DM
V
g
DD
SS
Rev. 2 — 11 January 2012
DD
SS
which attenuates the input voltage by a factor C
R S = 33 Ω
R S = 33 Ω
R S = 33 Ω
R S = 33 Ω
R1
1.5 kΩ
R1
1.5 kΩ
soft-connect switch
32-bit ARM Cortex-M0 microcontroller
002aaf893
002aaf894
USB-B
connector
USB-B
connector
LPC11U1x
i
/(C
© NXP B.V. 2012. All rights reserved.
i
+ C
g
). In slave
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