LPC1751 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

LPC1751

32-bit ARM Cortex-M3 MCU; up to 512 kB flash and 64 kB SRAM with Ethernet, USB 2.0 Host/Device/OTG, CAN

Philips Electronics 

NXP Semiconductors

LPC1759/58/56/54/52/51

32-bit ARM Cortex-M3 microcontroller

On the LPC1759/58/56/54/52/51, 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 LPC1759/58/56/54/52/51 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.

LPC1759_58_56_54_52_51_4

Product data sheet

Rev. 04 — 26 January 2010

© NXP B.V. 2010. All rights reserved.

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