OM11035 NXP Semiconductors, OM11035 Datasheet - Page 38
![KIT EVAL LPC1768 CR](/photos/9/21/92196/om11035_sml.jpg)
OM11035
Manufacturer Part Number
OM11035
Description
KIT EVAL LPC1768 CR
Manufacturer
NXP Semiconductors
Type
MCUr
Datasheet
1.OM11043.pdf
(79 pages)
Specifications of OM11035
Contents
Board and software
For Use With/related Products
LPC1768
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
568-4815
- Current page: 38 of 79
- Download datasheet (2Mb)
NXP Semiconductors
LPC1769_68_67_66_65_64_63
Product data sheet
7.29.8 Power domains
The LPC17xx 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 LPC17xx, I/O pads are powered by the 3.3 V (V
V
CPU and most of the peripherals.
Depending on the LPC17xx 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
V
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 (V
a dedicated 3.3 V supply for the CPU (V
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
(V
there is no power drain from the RTC battery when V
DD(REG)(3V3)
DD(3V3)
DD(REG)(3V3)
and V
pin powers the on-chip voltage regulator which in turn provides power to the
) is used to operate the RTC whenever V
DD(REG)(3V3)
All information provided in this document is subject to legal disclaimers.
Rev. 6.01 — 11 March 2011
pins together. This approach requires only one 3.3 V power
LPC1769/68/67/66/65/64/63
DD(REG)(3V3)
32-bit ARM Cortex-M3 microcontroller
). Having the on-chip voltage regulator
DD(REG)(3V3)
DD(REG)(3V3)
DD(3V3)
) pins, while the
is available.
is present. Therefore,
© NXP B.V. 2011. All rights reserved.
DD(3V3)
38 of 79
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