Datasheet

LPC185X_3X_2X_1X All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 4.1 — 6 May 2014 132 of 148
NXP Semiconductors
LPC185x/3x/2x/1x
32-bit ARM Cortex-M3 microcontroller
Remark: If the VBUS function of the USB1 interface is not connected, configure the pin
function for GPIO using the function control bits in the SYSCON block.
Remark: In OTG mode, it is important to be able to detect the VBUS level and to charge
and discharge VBUS. This requires adding active devices that disconnect the link when
VDDIO is not present.
Fig 46. USB interface on a bus-powered device
Fig 47. USB interface if the USB operates in OTG mode
REGULATOR
VBUSUSBn_VBUS
LPC18xx
VDDREG
USB-B
connector
USB
aaa-013016
VBUS
USBn_VBUS
LPC18xx
VDDIO
USB-B
connector
USB
aaa-013017
T2
T1
R1
R2
R3