EA-OEM-306 Embedded Artists, EA-OEM-306 Datasheet - Page 47

• Manufacturer Part Number: EA-OEM-306
• Description: KIT LPC3152 SODIMM 66X48 200POS
• Manufacturer: Embedded Artists
• Type: MCUr

Specifications of EA-OEM-306

• Contents: Base Board, Cable, Headset, OEM Board, Serial Number
• For Use With/related Products: LPC3152
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
LPC3152_3154
Preliminary data sheet
7.6 Real-Time Clock (RTC)
The Real-Time Clock module keeps track of the actual date and time, also when the
system is switched off. Advanced Digital Rights Management (DRM) schemes require a
secure and accurate real-time clock for managing rights such as time-limited playback
rights.
This module has the following features:
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Provides ‘Supply_OK’ detection connected to the system reset signal.
Normal power supply directly from Li-ion battery (PSU is by-passed).
Backup power supply from (external) capacitor.
Automatic switching between normal power supply and backup power supply.
Signals power loss to indicate invalid real time clock readings.
Runs on a 32 kHz oscillator.
Ultra-low power consumption.
The clock is implemented as a 32-bit counter at the rate of 1 Hz (derived from the 32
kHz clock).
Alarm timer that can generate an interrupt. This interrupt is available both as an
internal signal as well as a signal on an external pin.
The external interrupt (RTC_INT) can be used to switch on the system by switching
on the PSU through the PSU_PLAY pin.
The internal interrupt signal can be used to wake-up the system from suspend mode
through the event router.
Dedicated permanent supply domain.
All information provided in this document is subject to legal disclaimers.
Rev. 0.12 — 27 May 2010
LPC3152/3154
© NXP B.V. 2010. All rights reserved.
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