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LPC1756 数据表(PDF) 33 Page - NXP Semiconductors

部件名 LPC1756
功能描述  32-bit ARM Cortex-M3 MCU up to 512 kB flash and 64 kB SRAM with Ethernet, USB 2.0 Host/Device/OTG, CAN
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

LPC1756 数据表(HTML) 33 Page - NXP Semiconductors

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LPC1758_56_54_52_51_2
© NXP B.V. 2009. All rights reserved.
Objective data sheet
Rev. 02 — 11 February 2009
33 of 71
NXP Semiconductors
LPC1758/56/54/52/51
32-bit ARM Cortex-M3 microcontroller
7.29.8 Power domains
The LPC1758/56/54/52/51 provide two independent power domains that allow the bulk of
the device to have power removed while maintaining operation of the RTC and the backup
Registers.
On the LPC1758/56/54/52/51, I/O pads are powered by the 3.3 V (VDD(3V3)) pins, while
the VDD(REG)(3V3) pin powers the on-chip voltage regulator which in turn provides power to
the CPU and most of the peripherals.
Depending on the LPC1758/56/54/52/51 application, a design can use two power options
to manage power consumption.
The first option assumes that power consumption is not a concern and the design ties the
VDD(3V3) and VDD(REG)(3V3) pins together. This approach requires only one 3.3 V power
supply for both pads, the CPU, and peripherals. While this solution is simple, it does not
support powering down the I/O pad ring “on the fly” while keeping the CPU and
peripherals alive.
The second option uses two power supplies; a 3.3 V supply for the I/O pads (VDD(3V3)) and
a dedicated 3.3 V supply for the CPU (VDD(REG)(3V3)). Having the on-chip voltage regulator
powered independently from the I/O pad ring enables shutting down of the I/O pad power
supply “on the fly”, while the CPU and peripherals stay active.
The VBAT pin supplies power only to the RTC domain. The RTC requires a minimum of
power to operate, which can be supplied by an external battery. The device core power
(VDD(REG)(3V3)) is used to operate the RTC whenever VDD(REG)(3V3) is present. Therefore,
there is no power drain from the RTC battery when VDD(REG)(3V3) is available.


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