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LPC1547JBD48 Datasheet(PDF) 45 Page - NXP Semiconductors

Part # LPC1547JBD48
Description  32-bit ARM Cortex-M3 microcontroller; up to 256 kB flash and 36 kB SRAM
PDF  99 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

LPC1547JBD48 Datasheet(HTML) 45 Page - NXP Semiconductors

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LPC15XX
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 1 — 19 February 2014
45 of 99
NXP Semiconductors
LPC15xx
32-bit ARM Cortex-M3 microcontroller
8.35 Power domains
The LPC15xx 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.
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) is used to operate the RTC whenever VDD is present. Therefore, there is no power
drain from the RTC battery when VDD is and VDD >= VBAT + 0.3 V.
8.36 Integrated oscillators
The LPC15xx include the following independent oscillators: the system oscillator, the
Internal RC oscillator (IRC), the watchdog oscillator, and the 32 kHz RTC oscillator. Each
oscillator can be used for multiple purposes.
Following reset, the LPC15xx operates from the internal RC oscillator until software
switches to a different clock source. The IRC allows the system to operate without any
external crystal and the bootloader code to operate at a known frequency.
See Figure 14 for an overview of the LPC15xx clock generation.
Fig 15. Power distribution
REAL-TIME CLOCK
BACKUP REGISTERS
WAKE-UP
CONTROL
REGULATOR
32 kHz
OSCILLATOR
ALWAYS-ON/RTC POWER DOMAIN
MAIN POWER DOMAIN
RTCXIN
VBAT
VDD
RTCXOUT
VDD
VSS
to memories,
peripherals,
oscillators,
PLLs
to core
to I/O pads
ADC
TEMP SENSE
ACMP
DAC
INTERNAL
VOLTAGE REF
ADC POWER DOMAIN
VDDA
VSSA
LPC15xx
ULTRA LOW-POWER
REGULATOR
WAKEUP
aaa-010876



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