User's Guide

ATOP3.5G Product Description
80447ST10636A rev.10 – 2015-03-03
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 24 of 66
Mod. 0808 2011-07 Rev.2
8.1.7 RTC
The RTC is designed to have low-power consumption: less than 1 μA. The RTC typically runs
from the main chip power supply, conserving battery power while the rest of the device is
powered up. When operating from a battery, the RTC is operational down to 2.1 V. Battery power
can be provided from a standard 3 V Lithium button cell.
An ultra-low power 32 kHz oscillator provides a 1 Hz clock to the time counting portion of the
RTC, moving most of the power consumption out of the time counting function.
The RTC contains a small set of backup registers (20 bytes) for holding data while the main part
of the LPC1768 is powered off.
The RTC includes an alarm function that can wake up the LPC1768 from all reduced power
modes with a time resolution of 1 s.
8.2 Application processor
The application processor is running a Virtual Machine (VM) able to interpret Java applications. It
is running on the main CPU of the UMTS/EDGE/GPRS/GSM baseband and offers:
 portability to numerous platforms
 maintainability via secure download and update mechanisms
 large virtualized feature set, such as:
o secure network access (https)
o cryptography
o Near Field Communication (NFC)
2
 Java VM with the following features:
o High performance J2ME Virtual Machine
o based on IBM J9
o Connected Device Configuration 1.1.2
 CDC Foundation Profile 1.1.2, extended with the following Telit API's
o Wireless Messaging
o Location
o Audio playback
o Telephony
o Contactless communication - including secure element access
o Power management
o Service calls
o Firmware Update over The Air
 Connection to microcontroller via message passing
As for memory, the application processor features:
 256 MB of NAND flash memory available to store application data and code
 128 MB of volatile memory for application data (LPDDR)