LPC1547JBD48 datasheet(45/99 Pages) NXP

45 / 99 page

LPC15XX

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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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