Telit Communications S p A ME910C1NV, ME910C1NA Users Guide

ME910C1
HW User Guide
1VV03001351 Rev. 2 – 2017-07-19
Mod. 0805 2016-08 Rev.5
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
NOTICE
While reasonable efforts have been made to assure the accuracy of this document, Telit assumes no liability resulting from any inaccuracies or omissions in this document, or from use of the information obtained herein. The information in this document has been carefully checked and is believed to be reliable. However, no responsibility is assumed for inaccuracies or omissions. Telit reserves the right to make changes to any products described herein and reserves the right to revise this document and to make changes from time to time in content hereof with no obligation to notify any person of revisions or changes. Telit does not assume any liability arising out of the application or use of any product, software, or circuit described herein; neither does it convey license under its patent rights or the rights of others.
It is possible that this publication may contain references to, or information about Telit products (machines and programs), programming, or services that are not announced in your country. Such references or information must not be construed to mean that Telit intends to announce such Telit products, programming, or services in your country.
COPYRIGHTS
This instruction manual and the Telit products described in this instruction manual may be, include or describe copyrighted Telit material, such as computer programs stored in semiconductor memories or other media. Laws in the Italy and other countries preserve for Telit and its licensors certain exclusive rights for copyrighted material, including the exclusive right to copy, reproduce in any form, distribute and make derivative works of the copyrighted material. Accordingly, any copyrighted material of Telit and its licensors contained herein or in the Telit products described in this instruction manual may not be copied, reproduced, distributed, merged or modified in any manner without the express written permission of Telit. Furthermore, the purchase of Telit products shall not be deemed to grant either directly or by implication, estoppel, or otherwise, any license under the copyrights, patents or patent applications of Telit, as arises by operation of law in the sale of a product.
COMPUTER SOFTWARE COPYRIGHTS
The Telit and 3rd Party supplied Software (SW) products described in this instruction manual may include copyrighted Telit and other 3rd Party supplied computer programs stored in semiconductor memories or other media. Laws in the Italy and other countries preserve for Telit and other 3rd Party supplied SW certain exclusive rights for copyrighted computer programs, including the exclusive right to copy or reproduce in any form the copyrighted computer program. Accordingly, any copyrighted Telit or other 3rd Party supplied SW computer programs contained in the Telit products described in this instruction manual may not be copied (reverse engineered) or reproduced in any manner without the express written permission of Telit or the 3rd Party SW supplier. Furthermore, the purchase of Telit products shall not be deemed to grant either directly or by implication, estoppel, or otherwise, any license under the copyrights, patents or patent applications of Telit or other 3rd Party supplied SW, except for the normal non-exclusive, royalty free license to use that arises by operation of law in the sale of a product.
1VV0301351 Rev. 2 Page 2 of 81 2017-07-19
USAGE AND DISCLOSURE RESTRICTIONS
I. License Agreements
The software described in this document is the property of Telit and its licensors. It is furnished by express license agreement only and may be used only in accordance with the terms of such an agreement.
II. Copyrighted Materials
Software and documentation are copyrighted materials. Making unauthorized copies is prohibited by law. No part of the software or documentation may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, without prior written permission of Telit
III. High Risk Materials
Components, units, or third-party products used in the product described herein are NOT fault-tolerant and are NOT designed, manufactured, or intended for use as on-line control equipment in the following hazardous environments requiring fail-safe controls: the operation of Nuclear Facilities, Aircraft Navigation or Aircraft Communication Systems, Air Traffic Control, Life Support, or Weapons Systems (High Risk Activities"). Telit and its supplier(s) specifically disclaim any expressed or implied warranty of fitness for such High Risk Activities.
IV. Trademarks
TELIT and the Stylized T Logo are registered in Trademark Office. All other product or service names are the property of their respective owners.
V. Third Party Rights
The software may include Third Party Right software. In this case you agree to comply with all terms and conditions imposed on you in respect of such separate software. In addition to Third Party Terms, the disclaimer of warranty and limitation of liability provisions in this License shall apply to the Third Party Right software.
TELIT HEREBY DISCLAIMS ANY AND ALL WARRANTIES EXPRESS OR IMPLIED FROM ANY THIRD PARTIES REGARDING ANY SEPARATE FILES, ANY THIRD PARTY MATERIALS INCLUDED IN THE SOFTWARE, ANY THIRD PARTY MATERIALS FROM WHICH THE SOFTWARE IS DERIVED (COLLECTIVELY “OTHER CODE”), AND THE USE OF ANY OR ALL THE OTHER CODE IN CONNECTION WITH THE SOFTWARE, INCLUDING (WITHOUT LIMITATION) ANY WARRANTIES OF SATISFACTORY QUALITY OR FITNESS FOR A PARTICULAR PURPOSE.
NO THIRD PARTY LICENSORS OF OTHER CODE SHALL HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND WHETHER MADE UNDER CONTRACT, TORT OR OTHER LEGAL THEORY, ARISING IN ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE OTHER CODE OR THE EXERCISE OF ANY RIGHTS GRANTED UNDER EITHER OR BOTH THIS LICENSE AND THE LEGAL TERMS APPLICABLE TO ANY SEPARATE FILES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
1VV0301351 Rev. 2 Page 3 of 81 2017-07-19
APPLICABILITY TABLE (REMOVE UNUSED)
PRODUCTS
ME910C1-NA
ME910C1-NV
1VV0301351 Rev. 2 Page 4 of 81 2017-07-19
Contents
NOTICE 2
COPYRIGHTS ................................................................................................ 2
COMPUTER SOFTWARE COPYRIGHTS ...................................................... 2
USAGE AND DISCLOSURE RESTRICTIONS ............................................... 3
I. License Agreements ..................................................................... 3
II. Copyrighted Materials ................................................................... 3
III. High Risk Materials ....................................................................... 3
IV. Trademarks .................................................................................. 3
V. Third Party Rights ......................................................................... 3
APPLICABILITY TABLE (REMOVE UNUSED) ............................................. 4
CONTENTS .................................................................................................... 5
1. INTRODUCTION .......................................................................... 8
Scope ........................................................................................... 8
Audience....................................................................................... 8
Contact Information, Support ........................................................ 8
Text Conventions .......................................................................... 9
Related Documents ...................................................................... 9
2. OVERVIEW ................................................................................ 10
3. PINS ALLOCATION ................................................................... 12
Pin-out ........................................................................................ 12
LGA Pads Layout ........................................................................ 20
4. POWER SUPPLY ....................................................................... 21
Power Supply Requirements ....................................................... 21
Power Consumption* .................................................................. 23
General Design Rules ................................................................. 24
4.3.1. Electrical Design Guidelines ....................................................... 24
4.3.1.1. +5V Source Power Supply Design Guidelines ............................ 24
4.3.1.2. +12V Source Power Supply Design Guidelines .......................... 25
4.3.1.3. Battery Source Power Supply Design Guidelines ........................ 26
4.3.2. Thermal Design Guidelines ......................................................... 27
4.3.3. Power Supply PCB layout Guidelines ......................................... 27
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VAUX Power Output ................................................................... 29
5. DIGITAL SECTION .................................................................... 30
Logic Levels ................................................................................ 30
Power On.................................................................................... 30
Power Off.................................................................................... 36
Unconditional Shutdown ............................................................. 38
Fast power down ........................................................................ 41
5.5.1. Fast Shut Down by Hardware ..................................................... 41
5.5.2. Fast Shut Down by Software....................................................... 43
Communication ports .................................................................. 44
5.6.1. USB 2.0 HS ................................................................................ 44
5.6.2. SPI.............................................................................................. 45
5.6.2.1. SPI Connections ......................................................................... 45
5.6.2.2. Modem serial port 1 (USIF0) ....................................................... 46
5.6.2.3. Modem serial port 2 (USIF1) ....................................................... 48
5.6.2.4. RS232 level translation ............................................................... 48
General purpose I/O ................................................................... 49
5.7.1. Using a GPIO as INPUT ............................................................. 50
5.7.2. Using a GPIO as OUTPUT ......................................................... 51
5.7.3. Indication of network service availability ..................................... 51
External SIM Holder .................................................................... 53
ADC Converter ........................................................................... 53
6. RF SECTION .............................................................................. 54
Bands Variants ........................................................................... 54
TX Output power ......................................................................... 54
RX Sensitivity ............................................................................. 54
Antenna requirements................................................................. 54
6.4.1. PCB Design guidelines ............................................................... 56
6.4.2. PCB Guidelines in case of FCC Certification .............................. 58
6.4.2.1. Transmission line design ............................................................ 58
6.4.2.2. Transmission Line Measurements .............................................. 59
6.4.2.3. Antenna Installation Guidelines ................................................... 61
7. AUDIO SECTION ....................................................................... 62
Electrical Characteristics ............................................................. 62
Codec examples ......................................................................... 62
8. MECHANICAL DESIGN ............................................................. 63
1VV0301351 Rev. 2 Page 6 of 81 2017-07-19
Drawing ...................................................................................... 63
9. APPLICATION PCB DESIGN .................................................... 64
Footprint ..................................................................................... 64
PCB pad design .......................................................................... 65
PCB pad dimensions .................................................................. 66
Stencil ......................................................................................... 67
Solder paste ............................................................................... 67
Solder Reflow ............................................................................. 68
10. PACKAGING .............................................................................. 70
Tray ............................................................................................ 70
Reel ............................................................................................ 71
Carrier Tape detail ...................................................................... 72
Reel detail ................................................................................... 73
Packaging detail ......................................................................... 74
Moisture sensitivity ..................................................................... 74
11. CONFORMITY ASSESSMENT ISSUES .................................... 75
FCC/ISED Regulatory notices ..................................................... 75
12. SAFETY RECOMMENDATIONS................................................ 78
READ CAREFULLY .................................................................... 78
13. ACRONYMS ............................................................................... 79
14. DOCUMENT HISTORY .............................................................. 80
1VV0301351 Rev. 2 Page 7 of 81 2017-07-19
1. INTRODUCTION
Scope
Scope of this document is to give a description of some hardware solutions useful for
developing a product with the Telit ME910C1 module.
Audience
This document is intended for Telit customers, who are integrators, about to implement
their applications using our ME910C1 modules.
Contact Information, Support
For general contact, technical support services, technical questions and report documentation errors contact Telit Technical Support at:
TS-EMEA@telit.com TS-AMERICAS@telit.com TS-APAC@telit.com TS-SRD@telit.com
Alternatively, use:
http://www.telit.com/support
For detailed information about where you can buy the Telit modules or for recommendations on accessories and components visit:
http://www.telit.com
Our aim is to make this guide as helpful as possible. Keep us informed of your comments and suggestions for improvements.
Telit appreciates feedback from the users of our information.
1VV0301351 Rev. 2 Page 8 of 81 2017-07-19
Text Conventions
Danger – This information MUST be followed or catastrophic equipment failure or bodily injury may occur.
Caution or Warning – Alerts the user to important points about integrating the module, if these points are not followed, the module and end user equipment may fail or malfunction.
Tip or Information – Provides advice and suggestions that may be useful when integrating the module.
All dates are in ISO 8601 format, i.e. YYYY-MM-DD.
Related Documents
Telit_xE910_Global_Form_Factor_Application_Note_r13 Telit_Modem_Integration_Design_Guide_r0 SIM Holder Design Guides, 80000NT10001a
1VV0301351 Rev. 2 Page 9 of 81 2017-07-19
2. OVERVIEW
The aim of this document is the description of some hardware solutions useful for developing a product with the Telit ME910C1 module. In this document all the basic functions of a m2m module will be taken into account; for each one of them a proper hardware solution will be suggested and eventually the wrong solutions and common errors to be avoided will be evidenced. Obviously this document cannot embrace the whole hardware solutions and products that may be designed. The wrong solutions to be avoided shall be considered as mandatory, while the suggested hardware configurations shall not be considered mandatory, instead the information given shall be used as a guide and a starting point for properly developing your product with the Telit ME910C1 module. For further hardware details that may not be explained in this document refer to the Telit ME910C1 Product Description document where all the hardware information is reported.
NOTE:
(EN) The integration of the ME910C1 cellular module within user application shall be done according to the design rules described in this manual.
(IT) L’integrazione del modulo cellulare ME910C1 all’interno dell’applicazione dell’utente dovrà rispettare le indicazioni progettuali descritte in questo manuale.
(DE) Die Integration des ME910C1 Mobilfunk-Moduls in ein Gerät muß gemäß der in diesem Dokument beschriebenen Kunstruktionsregeln erfolgen.
(SL) Integracija ME910C1 modula v uporabniški aplikaciji bo morala upoštevati projektna navodila, opisana v tem priročniku.
(SP) La utilización del modulo ME910C1 debe ser conforme a los usos para los cuales ha sido deseñado descritos en este manual del usuario.
(FR) L’intégration du module cellulaire ME910C1 dans l’application de l’utilisateur sera faite selon les règles de conception décrites dans ce manuel.
(HE)
ME910C1
The information presented in this document is believed to be accurate and reliable. However, no responsibility is assumed by Telit Communications S.p.A. for its use, nor any
1VV0301351 Rev. 2 Page 10 of 81 2017-07-19
infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Telit Communications S.p.A. other than for circuitry embodied in Telit products. This document is subject to change without notice.
1VV0301351 Rev. 2 Page 11 of 81 2017-07-19
3. PINS ALLOCATION
Pin-out
Pin Signal I/O Function Type Comment
USB HS 2.0 COMMUNICATION PORT
B15 USB_D+ I/O USB differential Data (+)
C15 USB_D- I/O USB differential Data (-)
A13 VUSB I Power sense for the
internal USB transceiver.
Asynchronous Serial Port (USIF0) - Prog. / Data + HW Flow Control
N15 C103/TXD I Serial data input from DTE CMOS 1.8V
M15 C104/RXD O Serial data output to DTE CMOS 1.8V
M14 C108/DTR I Input for (DTR) from DTE CMOS 1.8V
L14 C105/RTS I Input for Request to send
CMOS 1.8V
signal (RTS) from DTE
P15 C106/CTS O Output for Clear to Send
CMOS 1.8V
signal (CTS) to DTE
N14 C109/DCD O Output for (DCD) to DTE CMOS 1.8V
P14 C107/DSR O Output for (DSR) to DTE CMOS 1.8V
R14 C125/RING O Output for Ring (RI) to
CMOS 1.8V
DTE
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SIM Card Interface
A6 SIMCLK
A7 SIMRST
A5 SIMIO
A4 SIMIN
A3 SIMVCC
O
External SIM signal – Clock 1.8 / 3V
O
External SIM signal – Reset 1.8 / 3V
I/O
External SIM signal – Data
I/O
I
-
External SIM signal – Presence (active low)
External SIM signal –
Power supply for the SIM
1.8 / 3V
CMOS 1.8
1.8 / 3V
Internal
pullup (47K)
Digital Voice Interface (DVI)
B9 DVI_WA0
I/
O
Digital Audio Interface
(WA0)
1.8V
B6 DVI_RX I Digital Audio Interface (RX) 1.8V
B7 DVI_TX
B8 DVI_CLK
I/
Digital Audio Interface (TX) 1.8V
O
I/
O
Digital Audio Interface
(CLK)
1.8V
SPI
D15 SPI_MOSI I SPI MOSI CMOS 1.8V
E15 SPI_MISO O SPI_MISO CMOS 1.8V
F15 SPI_CLK I SPI Clock CMOS 1.8V
1VV0301351 Rev. 2 Page 13 of 81 2017-07-19
DIGITAL IO
STAT LED
C8 GPIO_01 I/O GPIO_01 /STAT LED CMOS 1.8V
is alternate
C9 GPIO_02 I/O GPIO_02 CMOS 1.8V
C10 GPIO_03 I/O GPIO_03 CMOS 1.8V
C11 GPIO_04 I/O GPIO_04 CMOS 1.8V
B14 GPIO_05 I/O GPIO_05 CMOS 1.8V
C12 GPIO_06 I/O GPIO_06 CMOS 1.8V
C13 GPIO_07 I/O GPIO_07 CMOS 1.8V
K15 GPIO_08 I/O GPIO_08 CMOS 1.8V
function
L15 GPIO_09 I/O GPIO_09 CMOS 1.8V
G15 GPIO_10 I/O GPIO_10 CMOS 1.8V
RF SECTION
K1
ANTENNA I/O
LTE Antenna
(50 ohm)
RF
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GNSS Section
R9
R7
ANT_GNSS I
GNSS_LNA_ENA O
Miscellaneous Functions
R13
R12
R11
HW_SHUTDOWN* I
ON_OFF* I
VAUX/PWRMON O
Power Supply
M1
VBATT -
GNSS Antenna
(50 ohm)
External GNSS LNA
Enable
HW Unconditional
Shutdown
Input command for power
ON
Supply Output for external
accessories / Power ON
Monitor
Main power supply
(Baseband)
RF
CMOS 1.8V
1.8V Active low
1.8V Active low
1.8V
Power
M2
N1
N2
P1
P2
E1
G1
H1
J1
L1
VBATT -
VBATT_PA -
VBATT_PA -
VBATT_PA -
VBATT_PA -
Main power supply
(Baseband)
Main power supply (Radio
PA)
Main power supply (Radio
PA)
Main power supply (Radio
PA)
Main power supply (Radio
PA)
Power
Power
Power
Power
Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
A2
E2
1VV0301351 Rev. 2 Page 15 of 81 2017-07-19
GND - Ground Power
GND - Ground Power
F2
G2
H2
J2
K2
L2
R2
M3
N3
P3
R3
D4
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
M4
N4
P4
R4
N5
P5
R5
N6
P6
R6
P8
R8
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
P9
P10
R10
M12
1VV0301351 Rev. 2 Page 16 of 81 2017-07-19
GND - Ground Power
GND - Ground Power
GND - Ground Power
GND - Ground Power
B13
P13
E14
RESERVED
C1
D1
F1
B2
C2
D2
B3
C3
GND - Ground Power
GND - Ground Power
GND - Ground Power
RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
-
RESERVED
D3
E3
F3
G3
K3
L3
B4
C4
B5
C5
C6
C7
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
N7
P7
N8
N9
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RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
A10
N10
N11
P11
B12
D12
N12
P12
F14
G14
H14
J14
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
K14
N13
L13
J13
M13
K13
H13
G13
F13
B11
B10
A9
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
A8
E13
D13
D14
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RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
A14
A12
A11
H15
J15
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
RESERVED - RESERVED
WARNING:
Reserved pins must not be connected.
1VV0301351 Rev. 2 Page 19 of 81 2017-07-19
LGA Pads Layout
TOP VIEW
A B C D E F G H J K L M N P R
VBATT_
1 ADC_IN1 RES RES GND RES GND GND GND ANT GND VBATT
2 GND RES RES RES GND GND GND GND GND GND GND VBATT
SIMVC
3
4 SIMIN RES RES GND GND GND GND GND
RES RES RES RES RES RES RES RES RES RES GND GND GND GND
C
PA
VBATT_
PA
VBATT_
PA
VBATT_
PA
GND
5 SIMIO RES RES GND GND GND
6 SIMCLK DVI_RX RES GND GND GND
SIMRS
7
8 RES DVI_CLK GPIO_01 RES GND GND
9 RES
10 RES RES GPIO_03 RES GND GND
11 RES RES GPIO_04 RES RES
12 RES RES GPIO_06 RES GND RES RES
13 VUSB GND GPIO_07 RES RES RES RES RES RES RES RES RES RES GND
14 RES GPIO_05 RES RES GND RES RES RES RES RES
15 USB_D+ USB_D- TX AUX RX AUX SPI_CLK GPIO_10 RES RES GPIO_08 GPIO_09
DVI_TX RES RES RES
T
DVI_WA
GPIO_02 RES GND
0
C105/RTS C108/DTR C109/DCD C107/DSR C125/RI
C104/RXD C103/TXD C106/CT
GNSS_L
NA_EN
ANT_GN
SS
VAUX/P WRMON
ON_OFF
*
HW_SH
UTDOW
N*
NG
S
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4. POWER SUPPLY
The power supply circuitry and board layout are a very important part in the full product
design and they strongly reflect on the product overall performances, hence read carefully
the requirements and the guidelines that will follow for a proper design.
Power Supply Requirements
The external power supply must be connected to VBATT & VBATT_PA signals and must
fulfil the following requirements:
Power Supply
Nominal Supply Voltage 3.8V
Normal Operating Voltage
3.40 V÷ 4.20 V
Range
Extended Operating
3.10 V÷ 4.50 V
Voltage Range
Value
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NOTE:
The Operating Voltage Range MUST never be exceeded;
care must be taken when designing the application’s
power supply section to avoid having an excessive voltage
drop. If the voltage drop is exceeding the limits it could
cause a Power Off of the module.
The Power supply must be higher than 3.10 V to power on
the module.
Overshoot voltage (regarding MAX Extended Operating
Voltage) and drop in voltage (regarding MIN Extended
Operating Voltage) MUST never be exceeded;
The “Extended Operating Voltage Range” can be used only
with completely assumption and application of the HW
User guide suggestions.
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Power Consumption*
Mode Average
Mode Description
(mA)
Switched off 0.007mA Module supplied but switched off
IDLE mode
AT+CFUN=1 11.80 mA Normal mode: full functionality of the module
AT+CFUN=4 11.80 mA Disabled TX and RX; module is not registered on
the network
AT+CFUN=5 1.20 mA 2.56 secs DRx cycle
0.90 mA 81.92 secs DRx cycle
11.80mA RRC_CONNECTED (10.24 secs C-DRX)
0.70 mA RRC_IDLE (43.69 minutes I-DRx cycle)
Operative Mode
LTE Data call 130mA Channel BW 10MHz, RB=1, TX=0dBm
145mA Channel BW 10MHz, RB=1, TX=20dBm
190mA Channel BW 10MHz, RB=1, TX=23dBm
PSM Mode
AT#PSM=1 0.007mA No current drain from PSM pins
GPS
GNSS 29.00 mA GNSS Standalone 1Hz Tracking ( Non-Dpo)
*Preliminary data
NOTE: The electrical design for the Power supply should be made
ensuring it will be capable of a peak current output of at least:
0.8 A for LTE mode (3.80V supply).
1VV0301351 Rev. 2 Page 23 of 81 2017-07-19
NOTE: The reported values are an average among all the product
variants and bands for each network wireless technology.
The support of specific network wireless technology depends on
product variant configuration.
General Design Rules
The principal guidelines for the Power Supply Design embrace three different design
steps:
the electrical design
the thermal design
the PCB layout.
4.3.1. Electrical Design Guidelines
The electrical design of the power supply depends strongly from the power source where
this power is drained. We will distinguish them into three categories:
+5V input (typically PC internal regulator output)
+12V input (typically automotive)
Battery
4.3.1.1. +5V Source Power Supply Design Guidelines
The desired output for the power supply is 3.8V, hence there's not a big difference
between the input source and the desired output and a linear regulator can be used.
A switching power supply will not be suited because of the low drop out
requirements.
When using a linear regulator, a proper heat sink shall be provided in order to
dissipate the power generated.
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut
the current absorption peaks close to the Module, a 100μF capacitor is usually
suited.
Make sure the low ESR capacitor on the power supply output rated at least 10V.
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An example of linear regulator with 5V input is:
Guidelines
4.3.1.2. +12V Source Power Supply Design Guidelines
The desired output for the power supply is 3.8V, hence due to the big difference
between the input source and the desired output, a linear regulator is not suited and
shall not be used. A switching power supply will be preferable because of its better
efficiency.
When using a switching regulator, a 500kHz or more switching frequency regulator
is preferable because of its smaller inductor size and its faster transient response.
This allows the regulator to respond quickly to the current peaks absorption.
In any case the frequency and Switching design selection is related to the
application to be developed due to the fact the switching frequency could also
generate EMC interferences.
For car PB battery the input voltage can rise up to 15,8V and this should be kept in
mind when choosing components: all components in the power supply must
withstand this voltage.
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut
the current absorption peaks, a 100μF capacitor is usually suited.
Make sure the low ESR capacitor on the power supply output is rated at least 10V.
For Car applications a spike protection diode should be inserted close to the power
input, in order to clean the supply from spikes.
1VV0301351 Rev. 2 Page 25 of 81 2017-07-19
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