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HE910
User Manual
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Telit Communications S p A HE910 User Manual

HE910 Hardware User Guide
1vv03700925 Rev.9 07-02-2012
PRODUCT
HE910
HE910-GA
HE910-D
HE910 Hardware User Guide
Applicability Table
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 2 of 80
HE910 Hardware User Guide
DISCLAIMER
The information contained in this document is the proprietary information of Telit Communication any disclosure to persons other than the officers, employees, agents or subcontractors of the owner or licensee of this document, without the prior written consent of Telit, is strictly prohibited.
Telit makes every effort to ensure the quality of the information it makes available. Notwithstanding the foregoing, Telit does not make any warranty as to the information contained herein, and does not accept any liability for any injury, loss or damage of any kind incurred by use of or reliance upon the information.
Telit disclaims any and all responsibility for the application of the devices characterized in this document, and notes that the application of the device must comply with the safety standards of the applicable country, and where applicable, with the relevant wiring rules.
Telit reserves the right to make modifications, additions and deletions to this document due to typographical errors, inaccurate information, or improvements to programs and/or equipment at any time and without notice. Such changes will, nevertheless be incorporated into new editions of this application note.
All rights reserved.
© 2011, 2012 Telit Communications S.p.A.
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HE910 Hardware User Guide
Contents
1 INTRODUCTION ......................................................................................................................................................... 6
1.1 SCOPE ................................................................................................................................................................................ 6
1.2 AUDIENCE ........................................................................................................................................................................... 6
1.3 CONTACT INFORMATION, SUPPORT .......................................................................................................................................... 6
1.4 DOCUMENT ORGANIZATION ................................................................................................................................................... 7
1.5 TEXT CONVENTIONS .............................................................................................................................................................. 8
1.6 RELATED DOCUMENTS ........................................................................................................................................................... 8
1.7 DOCUMENT HISTORY ............................................................................................................................................................ 9
2 OVERVIEW .............................................................................................................................................................. 10
3 HE910 MODULE CONNECTIONS ............................................................................................................................... 11
3.1 PIN-OUT ......................................................................................................................................................................... 11
3.1.1 LGA Pads Layout (HE910 and HE910-GA) .............................................................................................................. 17
3.1.2 LGA Pads Layout (HE910-D) ................................................................................................................................... 18
4 HARDWARE COMMANDS ........................................................................................................................................ 19
4.1 TURNING ON THE HE910 ................................................................................................................................................... 19
4.2 TURNING OFF THE HE910 .................................................................................................................................................. 24
4.3 HE910 UNCONDITIONAL SHUTDOWN .................................................................................................................................... 27
5 POWER SUPPLY ....................................................................................................................................................... 30
5.1 POWER SUPPLY REQUIREMENTS ............................................................................................................................................ 30
5.2 POWER CONSUMPTION ....................................................................................................................................................... 31
5.3 GENERAL DESIGN RULES ...................................................................................................................................................... 32
5.3.1 Electrical Design Guidelines ................................................................................................................................... 32
5.3.2 Thermal Design Guidelines ..................................................................................................................................... 36
5.3.3 Power Supply PCB layout Guidelines ...................................................................................................................... 37
6 GSM/WCDMA ANTENNA......................................................................................................................................... 38
6.1 GSM/WCDMA ANTENNA REQUIREMENTS ............................................................................................................................ 38
6.2 GSM/WCDMA - PCB LINE GUIDELINES ................................................................................................................................ 40
6.3 GSM/WCDMA ANTENNA - INSTALLATION GUIDELINES ........................................................................................................... 41
6.4 ANTENNA DIVERSITY REQUIREMENTS ..................................................................................................................................... 42
6.5 GPS ANTENNA REQUIREMENTS (HE910 AND HE910-GA) ....................................................................................................... 43
6.5.1 Combined GPS Antenna ......................................................................................................................................... 43
6.5.2 Linear and Patch GPS Antenna ............................................................................................................................... 43
6.5.3 LNA and Front End Design Considerations ............................................................................................................. 43
6.5.4 GPS Antenna - PCB Line Guidelines ........................................................................................................................ 44
6.5.5 GPS Antenna - Installation Guidelines .................................................................................................................... 45
7 LOGIC LEVEL SPECIFICATIONS .................................................................................................................................. 46
7.1 RESET SIGNAL .................................................................................................................................................................... 47
8 USB PORT ................................................................................................................................................................ 48
8.1 USB 2.0 HS ...................................................................................................................................................................... 48
9 SPI PORT ................................................................................................................................................................. 49
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HE910 Hardware User Guide
9.1 SPI CONNECTIONS .............................................................................................................................................................. 50
10 SERIAL PORTS .......................................................................................................................................................... 51
10.1 MODEM SERIAL PORT 1 (USIF0) ................................................................................................................................... 52
10.2 MODEM SERIAL PORT 2 (USIF1) ................................................................................................................................... 54
10.3 RS232 LEVEL TRANSLATION ................................................................................................................................................ 55
11 AUDIO SECTION OVERVIEW .................................................................................................................................... 57
11.1 ELECTRICAL CHARACTERISTICS ............................................................................................................................................. 57
11.1.1 CODEC Examples .................................................................................................................................................. 57
12 GENERAL PURPOSE I/O ........................................................................................................................................... 58
12.1 GPIO LOGIC LEVELS .......................................................................................................................................................... 59
12.2 USING A GPIO PAD AS INPUT ........................................................................................................................................... 60
12.3 USING A GPIO PAD AS OUTPUT ........................................................................................................................................ 60
12.4 INDICATION OF NETWORK SERVICE AVAILABILITY ..................................................................................................................... 61
12.5 RTC BYPASS OUT ............................................................................................................................................................. 62
12.6 EXTERNAL SIM HOLDER IMPLEMENTATION ........................................................................................................................... 62
12.7 VAUX POWER OUTPUT ..................................................................................................................................................... 62
13 MOUNTING THE HE910 ON THE APPLICATION ........................................................................................................ 63
13.1 GENERAL ........................................................................................................................................................................ 63
13.2 MODULE FINISHING & DIMENSIONS ..................................................................................................................................... 63
13.3 RECOMMENDED FOOT PRINT FOR THE APPLICATION ................................................................................................................. 64
13.4 STENCIL .......................................................................................................................................................................... 65
13.5 PCB PAD DESIGN .............................................................................................................................................................. 65
13.6 RECOMMENDATIONS FOR PCB PAD DIMENSIONS (MM): .......................................................................................................... 66
13.7 SOLDER PASTE .................................................................................................................................................................. 68
13.7.1 HE910 Solder reflow ............................................................................................................................................. 68
14 PACKING SYSTEM .................................................................................................................................................... 70
14.1 MOISTURE SENSITIVITY ...................................................................................................................................................... 72
15 SAFETY RECOMMANDATIONS ................................................................................................................................. 73
16 CONFORMITY ASSESSMENT ISSUES ......................................................................................................................... 75
16.1 1999/5/EC DIRECTIVE ..................................................................................................................................................... 75
16.2 FCC/IC REGULATORY NOTICES ............................................................................................................................................ 79
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1 Introduction
1.1 Scope
The aim of this document is the description of some hardware solutions useful for developing a product with the Telit HE910 module.
1.2 Audience
This document is intended for Telit customers, who are integrators, about to implement their applications using our HE910 modules.
HE910 Hardware User Guide
1.3 Contact Information, Support
For general contact, technical support, to report documentation errors and to order
Center (TTSC) at:
TS-EMEA@telit.com TS-NORTHAMERICA@telit.com TS-LATINAMERICA@telit.com TS-APAC@telit.com
Alternatively, use:
http://www.telit.com/en/products/technical-support-center/contact.php
For detailed information about where you can buy the Telit modules or for recommendations on accessories and components visit:
http://www.telit.com
To register for product news and announcements or for product questions contact
ical Support Center (TTSC). 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.
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1.4 Document Organization
This document contains the following chapters:
provides a scope for this document, target audience, contact
and support information, and text conventions.
provides an overview of the document.
Chapter3 HE910 Module Connections
Chapter 4 How to operate on the module via hardware.
Chapter 5 Power supply requirements and general design rules.
Chapter 6 The antenna connection and board layout design are the most important parts in the full product design.
Chapter 7 Specific values adopted in the implementation of logic levels for this module.
Chapter 8 The USB port on the Telit HE910 is the core of the interface between the module and OEM hardware
PI port Refers to the SPI port of the Telit HE910
Chapter 10 Refers to the serial ports of the Telit HE910
Chapter 11 Refers to the audio blocks of the Base Band Chip of the HE910 Telit Modules.
Chapter 12 How the general purpose I/O pads can be configured.
Chapter 13 HE910 Mechanical dimensions and recomm
Chapter 14 Conformity Assessment Issues Information related to the Conformity Assessments.
HE910 Hardware User Guide
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1.5 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.
HE910 Hardware User Guide
1.6 Related Documents
HE910 Digital Voice Interface Application Note 80000NT10050A HE910 SPI Port Application Note 80000NT10053A HE910 Product description 80378ST10085a SIM Holder Design Guides 80000NT10001a AT Commands Reference Guide 80378ST10091A Telit EVK2 User Guide 1vv0300704
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 8 of 80
RReevviissiioonn
DDaattee
CChhaannggeess
ISSUE#0
2011-03-31
Preliminary Version
ISSUE#1
2011-05-19
Updated pinout on UART1
ISSUE#2
2011-05-25
Update chapter 13
ISSUE#3
2011-07-25
Added DVI app note references; chapter 4.1
ISSUE#4
2011-07-29
Updated audio, on_off/reset and digital sections
ISSUE#5
2011-10-18
Added STAT_LED info, Updated SPI pinout
ISSUE#6
2011-12-22
Power supply extended to 3.3 V
ISSUE#7
2012-01-16
Added HE910-GA and D; added Conformity assessment chapter
ISSUE#8
2012-02-03
Chapter 5.1 updated
ISSUE#9
2012-02-07
Chapter 4.2 updated
1.7 Document History
HE910 Hardware User Guide
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HE910
2 Overview
The aim of this document is the description of some hardware solutions useful for developing a product with the Telit HE910 module. In this document all the basic functions of a mobile phone 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 HE910 module. For further hardware details that may not be explained in this document refer to the Telit HE910 Product Description document where all the hardware information is reported.
NOTICE: (EN) The integration of the GSM/GPRS/WCDMA HE910 cellular module within user application shall be done according to the design rules described in this manual.
(DE) Die Integration des HE910 GSM/GPRS/WCDMA Mobilfunk-Moduls in ein Gerät muß gemäß der in diesem Dokument beschriebenen Kunstruktionsregeln erfolgen.
(SL) Integracija GSM/GPRS/WCDMA HE910 modula v uporabniški aplikaciji bo morala upoštevati projektna navodila, opisana v tem priročniku.
(SP) La utilización del modulo GSM/GPRS/WCDMA HE910 debe ser conforme a los usos para los cuales ha sido deseñado descritos en este manual del usuario.
(HE)
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 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.
HE910 Hardware User Guide
/WCDMA HE910
azioni progettuali descritte in questo manuale.
du module cellulaire GSM/GPRS/WCDMA HE910
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 10 of 80
PAD
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 signal
(RTS) from DTE
CMOS 1.8V
P15
C106/CTS
O
Output for Clear to Send signal
(CTS) to DTE
CMOS 1.8V
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 DTE
CMOS 1.8V
Asynchronous Auxiliary Serial Port (USIF1)
D15
TX_AUX
O
Auxiliary UART (TX Data to DTE)
CMOS 1.8V
E15
RX_AUX
I
Auxiliary UART (RX Data from
DTE)
CMOS 1.8V
D13
VDD_IO1
I
IO1 SUPPLY Input
This pin has to be connected
to E13
E13
VIO1_1V8
O
VIO1 Supply output (1.8V)
To be used only to supply
VDD_IO1
SIM card interface
A6
SIMCLK
O
External SIM signal – Clock
1.8 / 3V
A7
SIMRST
O
External SIM signal – Reset
1.8 / 3V
A5
SIMIO
I/O
External SIM signal – Data I/O
1.8 / 3V
A4
SIMIN
I
External SIM signal – Presence
(active low)
CMOS 1.8
A3
SIMVCC
-
External SIM signal – Power
supply for the SIM
1.8 / 3V
Digital Voice Interface (DVI) (See NOTE 1)
B9
DVI_WA0
I/O
Digital Audio Interface (WA0)
CMOS 1.8V
B6
DVI_RX
I/O
Digital Audio Interface (RX)
CMOS 1.8V
B7
DVI_TX
I/O
Digital Audio Interface (TX)
CMOS 1.8V
B8
DVI_CLK
I/O
Digital Audio Interface (CLK)
CMOS 1.8V
SPI
D15
SPI_MOSI
I
SPI MOSI
CMOS 1.8V
Shared with TX_AUX
HE910 Hardware User Guide
3 HE910 module connections
3.1 PIN-OUT
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E15
SPI_MISO
O
SPI_MISO
CMOS 1.8V
Shared with RX_AUX
F15
SPI_CLK
I
SPI Clock
CMOS 1.8V
H15
SPI_MRDY
I
SPI_MRDY
CMOS 1.8V
J15
SPI_SRDY
O
SPI_SRDY
CMOS 1.8V
DIGITAL IO
C8
GPIO_01
I/O
GPIO_01 /STAT LED
CMOS 1.8V
Alternate Function STAT LED
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
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
GSM/EDGE/UMTS Antenna
(50 ohm)
RF
F1
ANT_DIV
I
Antenna Diversity Input
(50 ohm)
RF
GPS SECTION (see NOTE1)
R9
ANT_GPS
I
GPS Antenna (50 ohm)
RF
R7
GPS_LNA_EN
O
Output enable for External LNA
supply
CMOS 1.8V
Miscellaneous Functions
R13
RESET*
I
Reset input
CMOS 1.8V
Active low
R12
ON_OFF*
I
Input command for power ON
CMOS 1.8V
Active low
C14
VRTC
I
VRTC Backup capacitor
Power
backup for the embedded
RTC supply
R11
VAUX/PWRMON
O
Supply Output for external
accessories / Power ON Monitor
1.8V
Power Supply
M1
VBATT
-
Main power supply (Baseband)
Power
M2
VBATT
-
Main power supply (Baseband)
Power
N1
VBATT_PA
-
Main power supply (Radio PA)
Power
N2
VBATT_PA
-
Main power supply (Radio PA)
Power
P1
VBATT_PA
-
Main power supply (Radio PA)
Power
P2
VBATT_PA
-
Main power supply (Radio PA)
Power
E1
GND - Ground
Power
G1
GND - Ground
Power
H1
GND - Ground
Power
J1
GND - Ground
Power
L1
GND - Ground
Power
HE910 Hardware User Guide
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A2
GND - Ground
Power
E2
GND - Ground
Power
F2
GND - Ground
Power
G2
GND - Ground
Power
H2
GND - Ground
Power
J2
GND - Ground
Power
K2
GND - Ground
Power
L2
GND - Ground
Power
R2
GND - Ground
Power
M3
GND - Ground
Power
N3
GND - Ground
Power
P3
GND - Ground
Power
R3
GND - Ground
Power
D4
GND - Ground
Power
M4
GND - Ground
Power
N4
GND - Ground
Power
P4
GND - Ground
Power
R4
GND - Ground
Power
N5
GND - Ground
Power
P5
GND - Ground
Power
R5
GND - Ground
Power
N6
GND - Ground
Power
P6
GND - Ground
Power
R6
GND - Ground
Power
P8
GND - Ground
Power
R8
GND - Ground
Power
P9
GND - Ground
Power
P10
GND - Ground
Power
R10
GND - Ground
Power
M12
GND - Ground
Power
B13
GND - Ground
Power
P13
GND - Ground
Power
E14
GND - Ground
Power
RESERVED
C1
RESERVED
-
RESERVED
D1
RESERVED
-
RESERVED
B2
RESERVED
-
RESERVED
C2
RESERVED
-
RESERVED
D2
RESERVED
-
RESERVED
B3
RESERVED
-
RESERVED
C3
RESERVED
-
RESERVED
HE910 Hardware User Guide
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D3
RESERVED
-
RESERVED
E3
RESERVED
-
RESERVED
F3
RESERVED
-
RESERVED
G3
RESERVED
-
RESERVED
H3
RESERVED
-
RESERVED
J3
RESERVED
-
RESERVED
K3
RESERVED
-
RESERVED
L3
RESERVED
-
RESERVED
B4
RESERVED
-
RESERVED
C4
RESERVED
-
RESERVED
B5
RESERVED
-
RESERVED
C5
RESERVED
-
RESERVED
C6
RESERVED
-
RESERVED
C7
RESERVED
-
RESERVED
N7
RESERVED
-
RESERVED
P7
RESERVED
-
RESERVED
N8
RESERVED
-
RESERVED
N9
RESERVED
-
RESERVED
A10
RESERVED
-
RESERVED
N10
RESERVED
-
RESERVED
N11
RESERVED
-
RESERVED
P11
RESERVED
-
RESERVED
B12
RESERVED
-
RESERVED
D12
RESERVED
-
RESERVED
N12
RESERVED
-
RESERVED
P12
RESERVED
-
RESERVED
F14
RESERVED
-
RESERVED
G14
RESERVED
-
RESERVED
H14
RESERVED
-
RESERVED
J14
RESERVED
-
RESERVED
K14
RESERVED
-
RESERVED
N13
RESERVED
-
RESERVED
L13
RESERVED
-
RESERVED
J13
RESERVED
-
RESERVED
M13
RESERVED
-
RESERVED
K13
RESERVED
-
RESERVED
H13
RESERVED
-
RESERVED
G13
RESERVED
-
RESERVED
F13
RESERVED
-
RESERVED
A11
RESERVED
-
RESERVED
A12
RESERVED
-
RESERVED
B1
RESERVED
-
RESERVED
HE910 Hardware User Guide
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B11
RESERVED
-
RESERVED
B10
RESERVED
-
RESERVED
A9
RESERVED
-
RESERVED
A8
RESERVED
-
RESERVED
D14
RESERVED
-
RESERVED
A14
RESERVED
-
RESERVED
HE910 Hardware User Guide
WARNING: Reserved pins must not be connected.
NOTE1: The Audio and GPS functions are not supported on HE910-D The following PADS have to be considered as RESERVED: B6, B7, B8, B9, R7, R9
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PAD
signal
M1,M2,N1,N2,P1,P2
VBATT & VBATT_PA
E1,G1,H1,J1,L1,A2,E2,F2,G2,H2, J2,K2,L2,R2,M3,N3,P3,R3,D4,M4, N4,P4,R4,N5,P5,R5,N6,P6,R6,P8, R8,P9,P10,R10,M12,B13,P13,E14
GND
R12
ON/OFF*
R13
RESET*
B15
USB_D+
C15
USB_D-
A13
VUSB
N15
C103/TXD
M15
C104/RXD
L14
C105/RTS
P15
C106/CTS
D15
TXD_AUX
E15
RXD_AUX
D13
VDD_IO1
E13
VIO1_1V8
HE910 Hardware User Guide
NOTE: If not used, almost all pins should be left disconnected. The only exceptions are the
following pins:
RTS pin should be connected to the GND (on the module side) if flow control is not used. The above pins are also necessary to debug the application when the module is assembled on it.
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A B C D E F
G H J K L M N P R
1 RES
RES
RES
GND
ANT_DIV
GND
GND
GND
ANT
GND
VBATT
VBATT_
PA
VBATT_
PA
2
GND
RES
RES
RES
GND
GND
GND
GND
GND
GND
GND
VBATT
VBATT_
PA
VBATT_
PA
GND
3
SIMVC
C
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
GND
GND
GND
GND
4
SIMIN
RES
RES
GND GND
GND
GND
GND
5
SIMIO
RES
RES GND
GND
GND
6
SIMCLK
DVI_RX
RES GND
GND
GND
7
SIMRS
T
DVI_TX
RES RES
RES
GPS_LN
A_EN
8
RES
DVI_CLK
GPIO_01 RES
GND
GND
9
RES
DVI_WA
0
GPIO_02 RES
GND
ANT_GP
S
10
RES
RES
GPIO_03 RES
GND
GND
11
RES
RES
GPIO_04 RES
RES
VAUX/P
WRMON
12
RES
RES
GPIO_06
RES GND
RES
RES
ON_OFF
*
13
VUSB
GND
GPIO_07
VDD_IO1 VIO1_1V
8
RES
RES
RES
RES
RES
RES
RES
RES
GND
RESET*
14
RES
GPIO_05
VRTC
RES
GND
RES
RES
RES
RES
RES
C105/RTS C108/DT
R
C109/DCD C107/DSR C125/RI
NG
15 USB_D+
USB_D-
TX AUX
RX AUX
SPI_CLK
GPIO_10
SPI_MR
DY
SPI_SR
DY
GPIO_08
GPIO_09
C104/RX
D
C103/TXD C106/CT
S
3.1.1 LGA Pads Layout (HE910 and HE910-GA)
TOP VIEW
HE910 Hardware User Guide
NOTE: The pin defined as RES has to be considered RESERVED and not connected on any pin
in the application.
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A B C D E F
G H J K L M N P R
1 RES
RES
RES
GND
ANT_DIV
GND
GND
GND
ANT
GND
VBATT
VBATT_
PA
VBATT_
PA
2
GND
RES
RES
RES
GND
GND
GND
GND
GND
GND
GND
VBATT
VBATT_
PA
VBATT_
PA
GND
3
SIMVC
C
RES
RES
RES
RES
RES
RES
RES
RES
RES
RES
GND
GND
GND
GND
4
SIMIN
RES
RES
GND GND
GND
GND
GND
5
SIMIO
RES
RES GND
GND
GND
6
SIMCLK
RES
RES GND
GND
GND
7
SIMRS
T
RES
RES RES
RES
RES
8
RES
RES
GPIO_01 RES
GND
GND
9
RES
RES
GPIO_02 RES
GND
RES
10
RES
RES
GPIO_03 RES
GND
GND
11
RES
RES
GPIO_04 RES
RES
VAUX/P
WRMON
12
RES
RES
GPIO_06
RES GND
RES
RES
ON_OFF
*
13
VUSB
GND
GPIO_07
VDD_IO1 VIO1_1V
8
RES
RES
RES
RES
RES
RES
RES
RES
GND
RESET*
14
RES
GPIO_05
VRTC
RES
GND
RES
RES
RES
RES
RES
C105/RTS C108/DT
R
C109/DCD C107/DSR C125/RI
NG
15 USB_D+
USB_D-
TX AUX
RX AUX
SPI_CLK
GPIO_10
SPI_MR
DY
SPI_SR
DY
GPIO_08
GPIO_09
C104/RX
D
C103/TXD C106/CT
S
3.1.2 LGA Pads Layout (HE910-D)
TOP VIEW
HE910 Hardware User Guide
NOTE: The pin defined as RES has to be considered RESERVED and not connected on any pin
in the application.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 18 of 80
4 Hardware Commands
4.1 Turning ON the HE910
To turn on the HE910 the pad ON_OFF* must be tied low for at least 5 seconds and then released.
The maximum current that can be drained from the ON# pad is 0,1 mA. A simple circuit to do it is:
HE910 Hardware User Guide
NOTE: Don't use any pull up resistor on the ON_OFF* line, it is internally pulled up. Using pull
up resistor may bring to latch up problems on the HE910 power regulator and improper power on/off of the module. The line ON_OFF* must be connected only in open collector or open drain configuration.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 19 of 80
HE910 Hardware User Guide
NOTE: In this document all the lines that are inverted, hence have active low signals are
labelled with a name that ends with or with a bar over the name.
TIP: To check if the device has powered on, the hardware line PWRMON should be
monitored.
NOTE: It is mandatory to avoid sending data to the serial ports during the first 200ms of the
module start-up.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 20 of 80
Modem ON Proc.
Y
Y
HW unconditional
SHUTDOWN
AT init sequence.
Start AT CMD.
N
PWMON = ON?
PWMON = ON?
AT answer in 1Sec ?
N
Y
N
Delay 1s
DELAY= 300mSec
ON_OFF = LOW
Delay = 5 Sec
ON_OFF = HIGH
Enter AT<CR>
HE910 Hardware User Guide
A flow chart showing the proper turn on procedure is displayed below:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 21 of 80
NOTE: In order to avoid a back powering effect it is recommended to avoid having any HIGH
logic level signal applied to the digital pins of the HE910 when the module is powered off or during an ON/OFF transition.
AT answer in
1Sec ?
Y
N
Start AT CMD.
DELAY= 300mSec
Enter AT<CR>
AT init sequence.
Modem ON Proc.
HW unconditional
SHUTDOWN
HE910 Hardware User Guide
A flow chart showing the AT command managing procedure is displayed below:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 22 of 80
HE910 Hardware User Guide
For example: 1- Let's assume you need to drive the ON# pad with a totem pole output of a +3/5 V microcontroller (uP_OUT1):
2- Let's assume you need to drive the ON# pad directly with an ON/OFF button:
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 23 of 80
HE910 Hardware User Guide
4.2 Turning OFF the HE910
Turning off of the device can be done in two ways:
via AT command (see HE910 Software User Guide, AT#SHDN) by tying low pin ON_OFF*
Either ways, the device issues a detach request to network informing that the device will not be reachable any more. To turn OFF the HE910 the pad ON_OFF* must be tied low for at least 2 seconds and then released.
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 24 of 80
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