Telit Wireless Solutions 1vv0300773a manual ARM Power Supply Requirements, Vrtc Backup supply

Page 24

 

 

 

GE863-PRO3Hardware User Guide

 

 

 

1vv0300773a Rev. 0 - 24/01/08

GSM TX and RX mode

 

GSM Sending data mode

 

Min power level

78,0

 

 

Max power level

200,0

 

 

 

GPRS (class

10) TX and RX mode

 

GPRS Sending data mode

 

Min power level

124,0

 

 

Max power level

371,0

 

 

 

The GSM system is made in a way that the RF transmission is not continuous, else it is packed into bursts at a base frequency of about 216 Hz, the relative current peaks can be as high as about 2A. Therefore the power supply has to be designed in order to withstand with these current peaks without big voltage drops; this means that both the electrical design and the board layout must be designed for this current flow. If the layout of the PCB is not well designed a strong noise floor is generated on the ground and the supply; this will reflect on all the audio paths producing an audible annoying noise at 216 Hz; if the voltage drop during the peak current absorption is too much, then the device may even shutdown as a consequence of the supply voltage drop.

TIP: The electrical design for the Power supply should be made ensuring it will be capable of a peak current output of at least 2 A.

5.2 ARM Power Supply Requirements

 

 

 

 

 

 

POWER SUPPLY

 

 

 

 

 

 

Nominal Supply Voltage

3.8 V

 

 

 

 

 

 

Operating Supply voltage range

3.4 V - 4.2 V

 

 

 

 

 

 

Absolute Maximum voltage range

3.30 – 4.5 V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GE863-PRO3

 

Mode

Typical Average (mA)

 

 

Mode description

 

Off

 

 

< 2 μA (TBD)

 

 

 

 

 

Full Speed

 

 

 

140 (TBD)

 

ARM is operational at full speed 200MHz CPU Clock , Main Clock

 

 

 

 

 

 

100 MHz and all peripherals active

 

 

 

 

 

 

 

 

 

Slow Clocking

 

 

1 (TBD)

 

ARM is running on slow clock with peripherals disabled

5.3 VRTC Backup supply

The RTC of the GSM/GPRS engine and the RTC & Shutdown controller of the ARM part are supplied by VRTC. This voltage supply is generated by a low quiescent current regulator inside the module that takes its power from VBATT pins. Since this voltage supply is needed to correctly boot the ARM part, if it is planned to remove the VBATT supply and still turn on the ARM part supplied by VBATT2, then an appropriate power supply must be provided to the VRTC pin.

To obtain several working years for the Real Time Clock of the GSM/GPRS engine and the RTC, 32KHz oscillator & Shutdown controller of the ARM part without VBATT power supply voltage, it is needed to make use of a lithium primary battery to supply the RTC circuits in the Telit Module.

The operative voltage for VRTC is lower than the voltage of primary lithium battery (3V nominal). It is therefore necessary to put a LDO voltage regulator in the circuit.

Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved

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Contents GE863-PRO3Hardware User Guide Contents GE863-PRO 3 Hardware User Guide This document is relating to the following products Disclaimer Overview GE863-PRO3Mechanical Dimensions Telit GE863-PRO3module overall dimension areLength 41,4 mm Width 31,4 mm Thickness 3,6 mm GE863-PRO3module connections DTE GPIO7 / Rftxdisable GSM C2 Vbatt C3 VrtcC11 Simrst C12 Simio D1 Charge D2 VAUX1 D10 GND D11 Simvcc D12 Simclk E1 GND E2 PwrmonNrst Reset ARM PB8PB9 ON/OFF*-APPB0 PB2PB1 PB7Hdmb XIN32XOUT32 PA3VBATT2 Reserved GNDBalls Layout ARM Port IO multiplexing ARM PIO Controller a multiplexingARM PIO Controller B multiplexing ARM PIO Controller C multiplexing Hardware Commands Turning on the GE863-PRO3GSM/GPRS Engine10k +1,8/5Hardware Unconditional Reboot of GSM/GPRS Engine 2Turning OFF the GE863-PRO3GSM/GPRS EngineHardware shutdown Turning ON/OFF the GE863-PRO3ARM ON/OFF*-AP # GND Power Supply GSM Power Supply RequirementsAT+CFUN=1 AT+CFUN=4ARM Power Supply Requirements Vrtc Backup supplyGeneral Design Rules Electrical design GuidelinesSuggested circuit is 817A19A Seiko1.1 + 5V input Source Power Supply Design Guidelines 1.2 + 12V input Source Power Supply Design Guidelines Battery Source Power Supply Design Guidelines Battery Charge control Circuitry Design Guidelines GE863-PRO3Hardware User Guide Thermal Design Guidelines Power Supply PCB layout Guidelines Antenna GSM Antenna RequirementsGSM Antenna PCB line Guidelines 50 ohmGSM Antenna installation Guidelines Electro Magnetic Interference GuidelinesLogic level specifications Absolute Maximum Ratings -Not Functional Parameter Min MaxOperating Range Interface levels Cmos Level Min Max GSM Gpio Current characteristics Level Typical Cmos 3.1V Current characteristics Level TypicalCmos 1.8V-A Current characteristics Level Typical Operating Range Interface levels Cmos Vrtc Level Min MaxSignal Function Phone resetSignal Min Max Serial Ports Modem Serial Port Modem Serial Port 2 DebugSignals of the GE863-PRO3GSM/GPRS engine serial port are RS232 level translation An example of level translation circuitry of this kind is GE863-PRO3Hardware User Guide Audio Section Overview Input Lines Microphone Short descriptionInput Lines Characteristics Micmt 1st differential microphone pathOutput Lines Speaker Output Lines Characteristics Earmt Differential Line-out Drivers PathEvaluation Kit for Telit GE863- PRO3 Modules 10 GSM/GPRS General Purpose I/O ON/OFFUsing a Gpio Pad as Input Using a Gpio Pad as OutputUsing the RF Transmission Control GPIO7 10.4Using the Rftxmon Output GPIO3Using the Alarm Output Using the Buzzer Output GPIO410.7Indication of network service availability LED statusDevice Status 10.9VAUX1 power output Operating Range VAUX1 power supplyRTC Bypass out Mounting the GE863-PRO3on the Application Board 11.1GeneralStencil PCB pad DesignSolder paste 11.1.4 GE863-PRO3Solder Reflow Following is the recommended solder reflow profile3C/second max Packing System Section A-AModules orientation on tray Moisture Sensibility Conformity Assessment Issues Safety Recommandations Document Change Log Revision Date Changes

1vv0300773a specifications

Telit Wireless Solutions 1VV0300773A is an advanced cellular module specifically designed for a wide range of IoT applications. This module is part of Telit’s extensive portfolio, which is renowned for its reliability and innovation in the wireless communication space. The 1VV0300773A module stands out due to its compact design and robust performance, making it an ideal choice for developers looking to integrate cellular connectivity into their projects.

One of the main features of the 1VV0300773A is its support for multiple communication protocols, which enhances its versatility. The module is designed to support various LTE CAT M1 and NB-IoT networks. These technologies are critical for low-power wide-area network (LPWAN) applications, allowing devices to stay connected over long distances while consuming minimal energy. This is particularly beneficial for battery-operated devices in sectors like smart agriculture, smart cities, and industrial IoT.

The module is equipped with a powerful ARM Cortex-M3 processor, which enables efficient data processing and facilitates complex computations required for many IoT applications. Additionally, it features a comprehensive set of interfaces, including UART, GPIO, and I2C, enabling easy integration with various sensors and peripherals. This modularity ensures that developers can customize their applications based on specific business needs.

Security is another crucial aspect of the 1VV0300773A module. Telit incorporates advanced security features including secure boot, data encryption, and a secure element, ensuring that data transmitted over cellular networks is protected against unauthorized access. This commitment to security is vital in today’s increasingly connected world, where data privacy is a top concern.

Furthermore, the 1VV0300773A module supports extensive over-the-air firmware updates, allowing manufacturers to deploy updates and enhancements seamlessly. This capability extends the lifecycle of devices in the field and ensures that they can adapt to new requirements and security standards over time.

In summary, Telit Wireless Solutions 1VV0300773A offers a blend of advanced features, robust technologies, and essential characteristics tailored for the rapidly evolving IoT landscape. Its combination of multi-network support, secure communication, and efficient processing makes it a standout choice for developers and enterprises looking to enhance their connectivity solutions.
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