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Bravo EVK
User Manual
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Telit Bravo EVK User Manual

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Mod. 0805 2017-01 Rev.6
Bravo EVK
HW User Guide
1VV0301646 Rev. 4 – 2021-03-10
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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.
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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.
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APPLICABILITY TABLE
PRODUCTS
BRAVO EVALUATION KIT
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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 .................................................................................. 4
CONTENTS ...................................................................................................... 5
1. INTRODUCTION ............................................................................ 7
1.1. Scope ............................................................................................. 7
1.2. Audience ........................................................................................ 7
1.3. Contact Information, Support ......................................................... 7
1.4. Text Conventions ........................................................................... 8
1.5. Related Documents ........................................................................ 9
2. OVERVIEW .................................................................................. 10
NOTICE 14
3. CONNECTORS ............................................................................ 15
3.1. Arduino Pin-out ............................................................................. 15
3.2. Raspberry PI Pin-Out ................................................................... 17
3.3. Native USB Connector ................................................................. 19
3.4. SPI Connector .............................................................................. 21
3.5. GPIO Connectors ......................................................................... 23
3.6. SIM Connectors ............................................................................ 25
4. CIRCUIT BLOCKS ....................................................................... 26
4.1. Antennas ...................................................................................... 26
4.2. UART & FTDI USB ....................................................................... 27
4.3. Sensors ........................................................................................ 31
4.4. Buttons and LEDs ........................................................................ 32
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4.5. External Power Supply ................................................................. 33
4.6. Battery Charger ............................................................................ 34
4.7. 3V3 Power Supply ........................................................................ 37
4.8. ME910 Power Supply ................................................................ ... 38
4.9. RTC Battery .................................................................................. 39
4.10. 1V8 Power Supply ........................................................................ 40
4.11. Wake Switch ................................................................................. 41
4.12. Shutdown Switch .......................................................................... 41
4.13. Watchdog ..................................................................................... 42
5. MECHANICAL DESIGN............................................................... 43
5.1. Drawing ........................................................................................ 43
6. SAFETY RECOMMENDATIONS ................................................. 44
6.1. READ CAREFULLY ..................................................................... 44
7. ACRONYMS ................................................................................ 45
8. DOCUMENT HISTORY ................................................................ 47
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1. INTRODUCTION
1.1. Scope
Scope of this document is to describe the hardware components of the Bravo EVK board based on Telit ME910C1 module.
1.2. Audience
This document is intended for Telit customers, who are integrators, about to implement their applications using our Bravo EVK board.
1.3. Contact Information, Support
For general contact, technical support services, technical questions and report documentation errors contact Telit Technical Support at:
• [email protected]
• [email protected]
• [email protected]
• [email protected]
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.
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1.4. 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.
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1.5. Related Documents
• ME910C1 HW User Guide, 1VV0301351
• xE910 Global Form Factor Application Note, 80000NT10060A
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2. OVERVIEW
The aim of this document is to describe the “Bravo” EVK board based on Telit ME910C1­WW IoT module.
The Bravo board can be used in different configurations:
• Standalone, using ME910C1 programmed with AppZone IDE
• Connected to an external CPU (ie PC) controlling the module through the UART or
USB port
• Connected to an Arduino standard form factor board, using the ME910C1 module connected through the UART port
• Connected to a Raspberry PI or Raspberry PI zero (or similar compatible board), using the ME910C1 module connected through the UART port
The ME910C1 module is powered either by an onboard 3.8V DC power supply or by a 3.7 V LIPO battery. All GPIO levels are set to 1.8 V.
Moreover, the board is fitted with the following sensors from Bosch Sensortec:
• BHI160B low-power smart-hub with integrated three axis gyroscope, three axis accelerometer plus a programmable microcontroller.
• BMM150 low power and low noise three-axis digital geomagnetic sensor
• BME680 integrated environmental sensor
Together, the above sensors provide:
• Accelerometer
• Gravity
• Linear acceleration
• Gyroscope
• Gyroscope uncalibrated
• Game rotation vector
• Step counter,
• Step detector
• Significant motion
• Tilt detector
• Pickup gesture
• Wake up gesture
• Glance gesture
• Activity recognition of standing, running, biking, in vehicle
• Geomagnetic field
• Magnetic field uncalibrated
• Orientation vector
• Rotation vector
• Geomagnetic rotation vector
• Temperature
• Humidity
• Pressure
• VOC (Volatile Organic Compounds)
This document lists and describes circuit building blocks and connectors.
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Arduino and Raspberry PI boards cannot be connected at the same time
Figure 1 - Bravo EVK Board
Figure 2 - Bravo EVK Board - Top View
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Figure 3 - Bravo EVK Board with Arduino format board
Figure 4 - Bravo EVK Board with Raspberry PI format board
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Figure 5 - Bravo EVK Board with Raspberry PI Zero format board
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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 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.
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3. CONNECTORS
3.1. Arduino Pin-out
Figure 6 - Arduino Pinout
Pin
Signal
I/O
Function
Type
Comment
POWER SUPPLY
J10,2
IOREF
I
I/O Level
J10,5
5V
I
External Power
J10,6
GND -
J10,7
GND -
J10,8
VIN
O
Power from BRAVO board
J12,7
GND -
GPIO INTERFACE
J10,7
ARD_VUSB_910_ON
I
USB Power on switch
J13,8
ARD_910_SHDN
I
ME910 SHDN Pin
J13,7
ARD_910_ON_OFF
I
ME910 ON_OFF Pin
Asynchronous Serial Port
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An Arduino format board can be stacked on top of the Bravo board, connected to the J10, J11, J12 and J13 connectors.
The Arduino board can be powered by the Bravo EVK board using the +5V from USBor J24 Power plug.
The IOREF signal from Arduino board is connected to the level translator VCCB and sets the interface B voltage level.
On the Arduino boards based on ATMEGA 8 bits MCU the IOREF level is +5V and the I/O pins operate at +5V.
On the Arduino boards based on ATSAMD21 32 bits ARM cpu the IOREF level is +3.3V, and all the I/O pins work at +3.3V.
To enable serial communication, configure J6 and J7 jumpers as described in the chapter “UART & FTDI USB”.
The ARD_VUSB_910_ON enables/disables power from native USB Connector to VUSB pin on ME910 module. For more details, please refer to the “Native USB Connector” chapter.
Arduino and the Raspberry PI boards cannot be connected at the same time.
J13,5
ARD_RTS
I
Input for Request to send
signal (RTS) from DTE
J13,4
ARD_CTS
O
Output for Clear to Send
signal (CTS) to DTE
J13,2
ARD_TXD
I
Serial data input from DTE
J13,1
ARD_RXD
O
Serial data output to DTE
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3.2. Raspberry PI Pin-Out
Figure 7 - Raspberry PI Pinout
Pin
Signal
I/O
Function
Type
Comment
POWER SUPPLY
M2,1
+3V3_RPI
I Power
M2,17
+3V3_RPI
I Power
M2,2
+5V_RPI
I Power
M2,4
+5V_RPI
I Power
M2,6
GND
- Power
M2,11
GND
- Power
M2,14
GND
- Power
M2,20
GND
- Power
M2,25
GND
- Power
M2,30
GND
- Power
M2,34
GND
- Power
M2,39
GND
-
GPIO INTERFACE M2,37
RPI_VUSB_910_ON
I
USB Power on switch
3V3
M2,38
RPI_910_SHDN
I
ME910 SHDN Pin
3V3
M2,40
RPI_910_ON_OFF
I
ME910 ON_OFF Pin
3V3
Asynchronous Serial Port
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M2,11
RPI_RTS
I
Input for Request to send
signal (RTS) from DTE
3V3
M2,36
RPI_CTS
O
Output for Clear to Send
signal (CTS) to DTE
3V3
M2,8
RPI_TXD
I
Serial data input from DTE
3V3
M2,10
RPI_RXD
O
Serial data output to DTE
3V3
The Raspberry PI board can power the Bravo EVK board, but not viceversa. All GPIOs are set to +3.3 V level: the +3V3_RPI signal goes to the VCCB on level translator and sets the interface B voltage level.
To enable serial communication, please configure the J6, J7 Selector as described in the “UART & FTDI USB”.
The RPI_VUSB_910_ON enables/disables power from native USB Connector to VUSB pin on ME910 module. For more details, please refer to the “Native USB Connector” chapter.
The Arduino and Raspberry PI boards cannot be connected to Bravo at the same time.
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3.3. Native USB Connector
Figure 8 - Native USB
Pin
Signal
I/O
Function
Type
Comment
POWER SUPPLY J3,1
5V
I
J3,5
GND
-
USB HS 2.0 COMMUNICATION PORT (FW upgrade and Data) J3,2
USB_D-
I/O
USB differential Data (-)
J3,3
USB_D+
I/O
USB differential Data (+)
J3,4
USB OTG ID
I
RESERVED
NC
The J3 USB plug is connected to the ME910 native USB port. The Bravo board is protected by resettable fuse and ESD discharge.
The USB 5V signal is by default disconnected from the A13/VUSB port but can be forced by closing the J5 jumper: if this jumper is open, VUSB signal connection is driven by VUSB_910_ON signal.
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Detaching VUSB from modem is mandatory to set the ME910 module into power saving mode.
VUSB_910_ON is connected to an output pin of Arduino/RaspberryPI. For more details,
please refer to the “Arduino Pin-out” or “Raspberry PI Pin-Out” chapters.
Jumper Position
Function
Comment
J5 Jumper
Open
VUSB_910 driven by VUSB_910_ON signal
Close
Force VUSB_910 connected to A13/VUSB
Signal Level
Function
Comment
VUSB_910_ON
High
VUSB_910 connected to A13/VUSB
Low
VUSB_910 not connected to A13/VUSB
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3.4. SPI Connector
Figure 9 - SPI Circuit
The ME910 SPI interface pins are available on J16 connector, the U10 level translator port A is powered at the same voltage as the MCU IOs.
The SPI Level translator B port is powered by +3V3 or VAUX_1V8 by shortening the 8,7 or 7,6 pin of J16
Outputs Switch to 3-State if either VCC is at GND or OE is high.
Shorted Pins
Function
Comment
Translator Enable J15
1,2
Level Translator to 3-State
6,7
Level Translator normal operation
Shorted Pins
Function
Comment
B Port Level Selection J16
7,8
+3V3 on SPI_POWER
6,7
VAUX_1V8 on SPI_POWER
Pin
Signal
I/O
Function
Type
Comment
POWER SUPPLY J16,8
+3V3
J16,7
SPI_PWR
External Interface Voltage
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J16,6
VAUX_1V8
J16,1
GND
-
GPIO J16,5
SPI_MOSI
O
Master Output Slave Input
J16,4
SPI_MISO
I
Master Input Slave Output
J16,3
SPI_CLK O Clock
J16,2
SPI_CS O Chip Select
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3.5. GPIO Connectors
Figure 10 - GPIO Connectors
Unused GPIO ports available externally thorough J21 and J22 connectors as listed in the table below
Pin
Signal
I/O
Function
Type
Comment
POWER SUPPLY J21,1
VAUX_1V8
O
J22,1
VAUX_1V8
O
J21,5
GND
-
J22,7
GND
-
GPIO J21,2
ADC_IN
AI
ADC Input
J21,3
ADC_IN2
I
J21,4
ADC_IN3
I
J22,2
DVI_WA0
J22,3
DVI_RX
J22,4
DVI_TX
J22,5
DVI_CLK
J22,6
REF_CLK
RESERVED
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Figure 11 - GPIO Connectors
General Purpose IO pins are available at connector J14 and are shared with Sensors I2C, Buttons and Leds. For more details, please refer to “Sensors” and “Buttons and LEDs” chapters.
Pin
Signal
I/O
Function
Type
Comment
POWER SUPPLY
J14,2
VAUX_1V8
O
J14,13
GND
-
GPIO
J14,3
GPIO_01/C8
I/O
Yellow LED LD1
J14,4
GPIO_02/C9
I/O
I2C SDA
J14,5
GPIO_03/C10
I/O
I2C SCK
J14,6
GPIO_04/C11
I/O
WDT_EN
J14,7
GPIO_05/B14
I/O
WDT_RFSH
J14,8
GPIO_06/C12
I/O
BHI160B INT
J14,9
GPIO_07/C13
I/O
PB3
J14,10
GPIO_08/K15
I/O
PB4
J14,11
GPIO_09/L15
I/O
Yellow LED LD2
J14,12
GPIO_10/G15
I/O
Yellow LED LD3
OTHER
J14,1
NC
J14,14
NC
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3.6. SIM Connectors
Figure 12 - SIM Sockets
The board can be fitted either with an eSIM in MFF2 format or a micro SIM socket: both inputs are ESD protected.
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4. CIRCUIT BLOCKS
4.1. Antennas
Figure 13 – Antennas
The ANTENNA Signal can be connected either to the PCB antenna or the SMA connector J4, which is disabled by default.
In order to enable J4 and connect an external cellular antenna, remove R14
resistor and solder a 0-ohm resistor on R15 pads: this will disable the onboard cellular antenna.
The GNSS antenna signal is connected to the J1 SMA connector.
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4.2. UART & FTDI USB
Figure 14 - UART & FTDI USB
The ME910 main UART is available for use with:
• FTDI Serial to USB converter on port J9
• Arduino UART
• Raspberry PI UART
• Generic UART with full hardware handshake
Only one interface can be selected at a time using J6/J7 dip switches as described in the table below:
Figure 15 - DIP Switch settings
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Pin
Signal
I/O
Function
Type
Comment
FTDI POWER SUPPLY J9,1
5V I FTDI Power
J9,5
GND
-
FTDI COMMUNICATION PORT J9,2
USB_D-
I/O
USB differential Data (-)
J9,3
USB_D+
I/O
USB differential Data (+)
J9,4
USB OTG ID
I
NC
Pin
Signal
I/O
Function
Type
Comment
UART POWER SUPPLY
J8,1
+3V3
O
J8,3
UART_PWR
I
Power to Level Transaltor
J8,3
VAUX_1V8
O
J8,13
GND
-
UART Signals
J8,5
UART_TXD
I
Serial data input from DTE
J8,6
UART_CTD
O
Output for Clear to Send
signal (CTS) to DTE
J8,7
UART_DTR
I
Input for (DTR) from DTE
J8,8
UART_DCD
O
Output for (DCD) to DTE
J8,9
UART_RTS
I
Input for Request to Send
signal (RTS) from DTE
J8,10
UART_DSR
O
Output for (DSR) to DTE
J8,12
UART_RING
O
Output for Ring (RI)
to DTE
J8,14
UART_RXD
O
Serial data output to
DTE
OTHER
J8,4
NC
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J8,11
NC
Shorted Pins
Function
Comment
UART Level Translator Voltage Selection J8
1,2
VAUX_1V8 to UART_PWR
1,3
+3V3 to UART_PWR
The +5V from the FTDI USB connector J9 can power the Bravo board. The FTDI serial to USB converter is powered only by the +5V signal from the J9 connector.
The level translator connecting the Arduino UART to the ME910 UART is powered by IOREF signal from Arduino board: when the Arduino is not connected the level translator is in 3-state.
The level translator connecting the Raspberry PI UART to the ME910 UART is powered by +3.3 V signal from Raspberry PI board: when the Arduino is not connected the level translator is in 3-state.
Full UART level can be selected shorting pins 1-2 or 1-3 in J8 Each level translator is powered only if both power supplies are present, 3-state
otherwise. Each translator is in 3-state if OE signal is high.
SW1
SW2
Function
Comment
Device Selection DP1
ON
ON
Enables UART level translator
OFF
ON
Enables RPI level translator
ON
OFF
Enables ARDUINO level translator
OFF
OFF
Enables FTDI level translator
hw handshake
Signal
Type
Direction
Function
UART Signals
DCD
Control
DCE to
DTE
Determines whether the DCE is connected to a working
phone line or not (only used in connection with modem).
TXD
Data
DTE to
DCE
Computer (DTE) sends information to the DCE.
RXD
Data
DCE to
DTE
Computer (DTE) receives information sent from the DCE.
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DTR
Control
DTE to
DCE
Computer (DTE) tells the DCE that it is ready to
communicate. Raised by DTE when powered on. In auto-
answer mode raised only when RI arrives from DCE
DSR
Control
DCE to
DTE
Modem (DCE) tells the computer that it is ready to talk.
Raised by DCE to indicate ready.
RTS
Control
DTE to
DCE
Computer (DTE) asks the modem if it can send information.
Raised by DTE when it wishes to send. Expects CTS from
DCE.
CTS
Control
DCE to
DTE
Modem (DCE) tells the computer (DTE) that it can send
information. Raised by DCE in response to RTS from DTE.
RI
Control
DCE to
DTE
Set when incoming ring detected, used for auto-answer
application. DTE raises DTR to answer (only used in
connection with modem).
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4.3. Sensors
Figure 16 - Bosch Sensors
The Bravo board includes the following Bosch Sensortec sensors:
• BHI160B low-power smart-hub with an integrated three axis gyroscope plus an integrated three axis accelerometer plus a programmable microcontroller.
• BMM150 low power and low noise 3-axis digital geomagnetic sensor
• BME680 integrated environmental sensor
The BHI160B huband BME680 environmental sensor are connected to the ME910 module using I2C communication, the BMM150 magnetometer is connected to the BHI160B smart hub auxiliary I2C port.
Pin
GPIO
Signal
Type
Direction
Function
I2C Signals
C10
03
SCK
Clock O I2C clock signal from ME910
C9
02
SDA
Data
I/O
I2C Data
C12
06
INT
Control I Interrupt from BHI160B
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4.4. Buttons and LEDs
Figure 17 - Pushbuttons and Leds
The Bravo board has two user-available pushbuttons: PB3 and PB4 and three LEDs, LD1, LD2 and LD3. The leds are ON when the MCU pin is high.
These signals are available at GPIO connector J14: please refer to chapter “GPIO Connectors” for further details.
Pin
GPIO
Direction
Function
C13
07
I
User Pushbutton
K15
08
I
User Pushbutton
C8
01
O
User Yellow LED
L15
09
O
User YellowLED
G15
10
O
User Yellow LED
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4.5. External Power Supply
Figure 18 - Power Supply
The + 5V voltage level that powers the 3.8 V power supply can be supplied by different external sources:
• USB ports (FTDI or ME910 native USB port)
• +5V on Raspberry PI Connector
• J24 External Power Connector
J24 External Power Connector must be connected to a 5V DC power supply. The connection is protected against polarity inversion.
J24 is a center positive coaxial connector with 2.0 mm diameter center pin, see picture below
Figure 19 - J24 Power Connector
The Raspberry PI board can power the Bravo board as long as an adequate power supply is connected to the Raspberry.
If the Bravo board is powered by J24 connector then the Arduino board is powered by the Bravo board (default).
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4.6. Battery Charger
Figure 20 - Battery Charger
A +3.7 V Lipo battery (not included) connected to J17 can power the Bravo board and can be charged by the onboard charger: the circuit receives +5V from the external power supply. For more details, please refer to the “External Power Supply” chapter.
The battery charger is powered by an external +5V power supply thorough the J24 connector or by the USB ports.
When an external power source is present and the battery is connected, the battery is charging. The VCC_910 voltage is supplied by the 3.8V LDO.
When the external power source on J24 is disconnected, the Bravo board is battery powered. In this case VCC_910 is supplied directly by the battery, by-passing the LDO.
While charging the battery the amber led is turned on.
To power the Bravo board, Telit suggests either using an external 5V DC power supply through J24 power connector or an external battery pack: this in order not to rely on the maximum current that can be supplied by the USB port.
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Battery connector J17 is S3B-PH-SM4-TB.
Figure 21 - Battery Connector
PIN
Function
Comment
Battery
1
+
2
Temperature sensor
3
-
Figure 22 Connector without temperature sensor (top) and with temperature sensor (bottom)
By default, the BRAVO board is configured for batteries without NTC temperature sensor. To disable battery temperature monitoring, the 0 ohm resistor R59 is mounted. If a battery with NTC temperature sensor is connected to the board WITHOUT removing
R59 resistor, the battery charger will function properly but battery temperature is not monitored.
To enable temperature monitoring, please remove R59 resistor from the board.
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WARNING
Use Li-Ion battery V
nom
= 3.7V, V
chrg
= 4.2V Capacity >= 700 mAh
Li-Po batteries are charged at 4.2V with a current that is usually half the nominal capacity (C/2). This board has a dedicated IC that has a preset charging current of 350mAh: this means that the MINIMUM capacity of the Li-Po battery shall be 700 mAh.
It is strongly recommended that a Li-Po battery of at least 700mAh capacity is selected. Smaller cells will be damaged by this current and may overheat, release gasses, catch fire and explode.
A larger cell will take more time to charge, but won't overheat or cause any harm.
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4.7. 3V3 Power Supply
Figure 23 - 3V3 Power Supply
The Bravo board also provides a +3.3 V power source to power LEDs and Level Translator for UART connection.
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4.8. ME910 Power Supply
Figure 24 - ME910 Power Supply Circuit
Power is delivered from VCC_910 to the ME910 module using the above pictured circuit. R66, R67 and R68 resistors can be removed and connectors J18, J19 and J20 can be
used to measure current consumption.
Connector
Function
Comment
Current Sense
J18
Total current to ME910 module
J19
Current on VBATT_PA
J20
Current on VBATT
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4.9. RTC Battery
Figure 25 - RTC battery power supply
The VRTC pin available on some ME910 variants can be connected to a coin battery by means of a LDO power supply.
This circuit is actually not mounted on the Bravo board, but is described here for future use.
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4.10. 1V8 Power Supply
Figure 26 - ME910C1 internal power supply
The ME910C1 module is powered at 3.8 V, but all I/O operate at 1.8 V: the VAUX/PWRMON provides the 1.8 V level to be used by level translators and onboard Bosch sensors. For additional details, please refer to “Sensors” chapter.
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4.11. Wake Switch
Figure 27 - ON/OFF Switch Circuit
The ON_OFF#/WAKE# pin can be controlled by the PB3 bush-button or by the 910_ON_OFF signal that is connected to ARD_910_ON_OFF or RPI_910_ON_OFF signal coming from Arduino or Raspberry PI connected boards respectively.
For additional details, please refer to chapter “Arduino Pin-outArduino Pin-out”or “Raspberry PI Pin-Out”.
4.12. Shutdown Switch
Figure 287 - SHUTDOWN Switch Circuit
The HW_SHUTDOWN# pin can be controlled by the PB4 bush-button or by the 910_SHDN signal that is connected to ARD_910_SHDN or RPI_910_SHDN signal coming from Arduino or Raspberry PI connected boards respectively. For additional details, please refer to chapter “Arduino Pin-outArduino Pin-out”or “Raspberry PI Pin-Out”.
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4.13. Watchdog
Figure 298 - Watchdog Circuit
The HW_SHUTDOWN# and ON_OFF#/WAKE# pins can be controlled the U11A STM8L microcontroller to enable whatchdog functionality.
The WDT chip is not mounted by default.
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5. MECHANICAL DESIGN
5.1. Drawing
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6. SAFETY RECOMMENDATIONS
6.1. READ CAREFULLY
Be sure the use of this product is allowed in the country and in the environment required. The use of this product may be dangerous and has to be avoided in the following areas:
• Where it can interfere with other electronic devices in environments such as
hospitals, airports, aircrafts, etc.
• Where there is risk of explosion such as gasoline stations, oil refineries, etc. It is the
responsibility of the user to enforce the country regulation and the specific environment regulation.
Do not disassemble the product; any mark of tampering will compromise the warranty validity. We recommend following the instructions of the hardware user guides for correct wiring of the product. The product has to be supplied with a stabilized voltage source and the wiring has to be conformed to the security and fire prevention regulations. The product has to be handled with care, avoiding any contact with the pins because electrostatic discharges may damage the product itself. Same cautions have to be taken for the SIM, checking carefully the instruction for its use. Do not insert or remove the SIM when the product is in power saving mode.
The system integrator is responsible for the functioning of the final product; therefore, care has to be taken to the external components of the module, as well as any project or installation issue, because the risk of disturbing the GSM network or external devices or having impact on the security. Should there be any doubt, please refer to the technical documentation and the regulations in force. Every module has to be equipped with a proper antenna with specific characteristics. The antenna has to be installed with care in order to avoid any interference with other electronic devices and has to guarantee a minimum distance from the body (20 cm). In case this requirement cannot be satisfied, the system integrator has to assess the final product against the SAR regulation.
The European Community provides some Directives for the electronic equipment introduced on the market. All of the relevant information is available on the European Community website:
http://ec.europa.eu/enterprise/sectors/rtte/documents/
The text of the Directive 99/05 regarding telecommunication equipment is available, while the applicable Directives (Low Voltage and EMC) are available at:
http://ec.europa.eu/enterprise/sectors/electrical/
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7. ACRONYMS
TTSC
Telit Technical Support Centre
USB
Universal Serial Bus
HS
High Speed
DTE
Data Terminal Equipment
UMTS
Universal Mobile Telecommunication System
WCDMA
Wideband Code Division Multiple Access
HSDPA
High Speed Downlink Packet Access
HSUPA
High Speed Uplink Packet Access
UART
Universal Asynchronous Receiver Transmitter
HSIC
High Speed Inter Chip
SIM
Subscriber Identification Module
SPI
Serial Peripheral Interface
ADC
Analog – Digital Converter
DAC
Digital – Analog Converter
I/O
Input Output
GPIO
General Purpose Input Output
CMOS
Complementary Metal – Oxide Semiconductor
MOSI
Master Output – Slave Input
MISO
Master Input – Slave Output
CLK
Clock
MRDY
Master Ready
SRDY
Slave Ready
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CS
Chip Select
RTC
Real Time Clock
PCB
Printed Circuit Board
ESR
Equivalent Series Resistance
VSWR
Voltage Standing Wave Radio
VNA
Vector Network Analyzer
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8. DOCUMENT HISTORY
Revision
Date
Changes
0
2020-02-21
Initial revision
1
2020-03-23
DIP Switch table added
2
2020-09-02
Battery NTC information added
3
2021-02-16
J8 table pinout updated
4
2021-03-10
J8 and J9 pinout tables updated
Page 48
Mod. 0805 2017-01 Rev.6
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