Atmel ATA8520-EK3-E Manual de usuario

9373E-AUTO-11/15

Features

●User guide for the evaluation kit ATA8520-EK1-E and extension boards

ATA8520-EK2-E and ATA8520-EK3-E

●This kit demonstrates a Flash application with the

●ATA8520-EK1-E evaluation kit:

with the Atmel®SIGFOX™ATA8520D V1.3 transceiver device and an Atmel

ATmega328P AVR®microcontroller with AT30TS75A temperature sensor as a

battery-powered kit for standalone operation

●ATA8520-EK2-E and ATA8520-EK3-E extension boards:

Includes Atmel SIGFOX ATA8520D V1.3 transceiver device with an AT30TS75A

temperature monitoring device. An additional MCU application development kit,

i.e. Xplained mini or Arduino UNO is required.

Description

This user guide describes an evaluation kit and the extension boards for a SIGFOX

application. This application uses an Atmel ATmega328P AVR microcontroller to

read out an AT30TS75A temperature sensor using the built-in TWI connection and controls

the RF telegram transmission using the SIGFOX ATA8520D V1.3 transceiver device. This

application requires a SIGFOX base station infrastructure to capture the RF telegram and

supply payload data at the SIGFOX back end of the SIGFOX Cloud. For more information

on operating the SIGFOX network and SIGFOX Cloud, see http://www.sigfox.com

information.

The evaluation and development kit tool packs are available for download from the Atmel

website: http://www.atmel.com/devices/ATA8520.aspx.These tool packs include

●The ATAN0054 quick start guide for the kit and the Atmel ATAN0104 user guide

●The schematic, layout and Gerber data for the ATAB0101A PCB

●The source code for the Atmel ATmega328P as an Atmel Studio 6 project

The Atmel ATA8520D SIGFOX transceiver is a SIGFOX-certified device which includes the

complete SIGFOX protocol stack to operate in the SIGFOX network within the 868MHz

ISM band. The device is controlled from any host MCU using the SPI commands as

described in the datasheet [1]. Included in the tool pack is a ATA8520D library as C source

code for the SPI commands.

APPLICATION NOTE

User Guide for the Evaluation Kit ATA8520-EK1-E and the

ATA8520-EK2-E and ATA8520-EK3-E Extension Boards

ATAN0104

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References

[1] Atmel®ATA8520D datasheet and user guide

[2] Atmel AT30TS75A datasheet

[3] http://www.sigfox.com

[4] http://backend.sigfox.com

[5] http://www.atmel.com/devices/ATA8520.aspx

[6] Atmel ATAN0054 – ATA8520-EK1-E/EK2-E/EK3-E quick start guide

[7] ATA8520-EK123-E_Tool_pack_V1.0.zip

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1. Getting Started with the ATA8520-EK1-E Kit

Figure 1-1 shows the components which are included in the evaluation kit. The kit includes

●A single PCB ATAB0101A with

●An Atmel®ATA8520D SIGFOX™transceiver device

●An Atmel ATmega328P AVR®microcontroller at 8MHz

●An AT30TS75A temperature sensor with TWI

●An 868MHz monopole antenna for connection to the SMA connector

The kit requires an external power supply or battery for 3.0V to 3.3V at 50mA which is not included in the kit.

Figure 1-1. ATA8520-EK1-E Kit Components

The 868MHz monopole antenna is connected to the SMA connector of the PCB and the external power supply or battery has

to be connected to connector X1.

Caution: Ensure correct polarity at the connection to avoid damage to the equipment. The PCB has no reverse polarity

protection for the power supply connection.

The kit comes with preconfigured devices for starting the Flash application of the Atmel ATmega328P once the power is

applied. This application controls the RF telegram transmission and reads out the temperature sensor at one-hour intervals

or when pressing the SW1 button. The red LED1 starts blinking for about 7-8s, i.e. during telegram transmission. The device

then enters power-down mode until a wake-up from the internal timer or a button press occurs.

Every fifth transmission is executed as an uplink/downlink request, i.e. it will first transmit the RF telegram with sensor data

and requests a payload data packet from the SIGFOX cloud via a base station. The execution of these request will take

about 40-50s.

The Atmel ATA8520D device includes the SIGFOX ID and PAC registration code (see label attached to PCB) to register the

kit with the user's account for the SIGFOX back end. The user has to open a SIGFOX cloud account to access the back end.

From this account the data payload transmitted from the devices can be retrieved in various ways as described in the

SIGFOX online help.

An Atmel debugger (Atmel JTAGICE3 or Atmel ICE), which can be connected to connector XISP1, is required for application

development. Please see the marker for pin1 to connect with the correct orientation. The debugger can only be used if

Atmel Studio 6 is installed in the front end. Atmel Studio 6 can be downloaded from http://www.atmel.com with additional

user instructions and tools. The documentation for the kit components and for the software is included in the tool pack zip

folder [7] which can be downloaded from the Atmel website [5].

The kit and the boards are preprogrammed and temperature calibrated to operate at room temperature (24°C). For operation

with a wider temperature range a temperature calibration as described in “ATAN0142 - ATA8520D Crystal Calibration” has

to be applied. This is mandatory to comply with the CE certification for the kit and boards and is valid for a temperature range

of –20°C to +55°C.

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2. Getting Started with the ATA8520-EK2-E and -EK3-E Extension Boards

Figure 2-1 and Figure 2-4 show the components which are required for the evaluation kit. The kit includes

●A single PCB ATAB0101A with

●An Atmel®ATA8520D SIGFOX™transceiver device

●An AT30TS75A temperature sensor with TWI

●An 868MHz monopole antenna for connection to the SMA connector

The kit is available in two versions depending on the connector type of the additionally required development kit:

●An ATA8520-EK2-E Xplained mini (Figure 2-1): to be used with an additional Xplained mini (Figure 2-2) or Arduino

UNO kit

●An ATA8520-EK3-E Xplained Pro (Figure 2-3): to be used with an additional Xplained Pro kit (Figure 2-4)

Figure 2-1. ATA8520-EK2-E Xplained Mini Extension Board with Attached External Antenna

Figure 2-2. ATA8520-EK2-E Xplained Mini Extension Board Mounted on Xplained Mini

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Figure 2-3. ATA8520-EK3-E Xplained Pro Extension Board

Figure 2-4. ATA8520-EK3-E Xplained Pro Extension Board with SAMD21 Xplained Pro Kit

The 868MHz monopole antenna is connected to the SMA connector of the PCB and the board is powered from the attached

evaluation kit using 3V/5V for the ATA8520-EK2-E Xplained Mini and 3V for the ATA8520-EK3-E Xplained Pro.

The following Flash applications are available as part of tool pack distribution:

●Xplained mini – Atmega328P application at 5V/16MHz

●Arduino UNO sketch and library at 5V/16MHz

●SAMD21 application for Xplained Pro at 3V/48MHz

This application controls the RF telegram transmission and reads out the temperature sensor at 15-minute intervals or when

pressing the SW1 button. The red LED1 starts blinking for about 7-8s, i.e. during telegram transmission. The device then

runs in a main loop until an event from the internal timer or a button press occurs.

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Every fifth transmission is executed as an uplink/downlink request, i.e. it will first transmit the RF telegram with sensor data

and requests a payload data packet from the SIGFOX cloud via a base station. The execution of these request will take

about 40-50s.

The ATA8520D device includes the SIGFOX ID and PAC registration code (see label attached on the PCB) to register the kit

with the user's SIGFOX back-end account. The user has to open a SIGFOX cloud account to access the back end. From this

account the data payload transmitted from the devices can be retrieved in various ways as described in the SIGFOX online

help.

The Atmel debugger included in the development kits can be used for application development. Application development

and use of the debugger is only possible if Atmel Studio 6 is installed in the front end. Atmel Studio 6 can be downloaded

from http://www.atmel.com with additional user instructions and tools. The documentation for the kit components and for the

software is included in the tool pack zip folder [7] which can be downloaded from

http://www.atmel.com/devices/ATA8520.aspx.

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3. Tool Pack for the Kits

The tool pack zip folder [7] contains the documentation and software for the kit. Extract the folder into a directory on the PC

to get the following structure:

..\Application_Notes documentation for the kit and the application notes for the devices

..\Documentation data sheets of the devices

..\Hardware hardware documentation of the boards

..\Software software for the kit

..\Software\ATA8520-EK1-E Atmel®Studio 6 project directory for ATA8520-EK1-E kit with ATmega328P

..\Software\ATA8520-EK2-E Atmel Studio 6 project directory for ATA8520-EK2-E board with Atmega328P

..\Software\ATA8520-EK3-E Atmel Studio 6 project directory for ATA8520-EK3-E board with SAMD21

4. ATA8520D SIGFOX Certified Transceiver

The Atmel ATA8520D SIGFOX™transceiver includes the SIGFOX protocol library and a SPI communication interface for

controlling device operation. The transceiver buffer of the device is loaded with a max. of 12 bytes of payload data for

transmission in the 868MHz ISM band. The ATA8520D device can also receive payload data with 8 Bytes from the SIGFOX

cloud when transmitting an uplink/downlink request. The Atmel ATA8520D device is certified by SIGFOX to participate in

their network. A second certification step for the module or system including antenna is also required with a classification of

the module or system RF performance, i.e. radiated RF output power. As a result, the RF path including antenna must also

have SIGFOX certification.

The key parameters for the RF link are:

●RF channels: 868.0 to 868.6MHz for uplink and 869.4 to 869.65MHz for downlink

●RF output power: max. 14.5dBm

●RF sensitivity: –126dBm

●Data rate: 100bit/s with DBPSK modulation for uplink and 600bit/s with GFSK modulation for downlink

●Data payload: max. 12byte with LSB first for uplink and 8 bytes for downlink

●Duty cycle: max. 5 telegrams/hour, i.e. < 1% for uplink and max. 4 telegrams/day for downlink

The data transmission is AES encrypted.

The SIGFOX ID and PAC registration code are printed on a label attached to the PCB and can also be read out from the

device using the SPI command interface. This ID and code are required for registering the device with the user's account for

the SIGFOX back end.

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5. ATAB0101A PCB Description

Figure 5-1 on page 9 shows the ATAB0101A PCB used as a platform for the SIGFOX™kits. It works in three different modes

depending on the component mounted on the PCB:

1. Battery powered standalone operating mode for the ATA8520-EK1-E kit:

●Includes the Atmel®ATA8520D SIGFOX device

●Includes the Atmel ATmega328P AVR®microcontroller with 8MHz internal clock and external 32.768kHz

crystal

●Includes the AT30TS75A temperature sensor with TWI

●Includes an ATAES132 crypto device (footprint)

●Includes an SMA antenna connector for an 868MHz external monopole antenna

●Two LEDs:

i. Green LED LD1 to indicate the sensor power

ii. Red LED LD2 connected to port pin PD5 and connector X2/pin8 and X6/pin6 for the user application

●User button SW1 connected to port pin PD6 and to connectors X2/pin4 and X6/pin7

●Supply voltage divider connected to pin ADC0 to measure the battery voltage against the internal 1.1V

reference

●Includes the footprint for the following TWI sensor devices:

i. BMP180 air pressure sensor

ii. HTU20D/SHT20 humidity sensor

2. Operating mode with an additional Xplained mini or Arduino UNO kit for the ATA8520-EK2-E extension board

using an ATmega328P:

●Includes the Atmel ATA8520D SIGFOX device

●Includes the AT30TS75A temperature sensor with TWI

●Includes an ATAES132 crypto device (footprint)

●Includes an SMA antenna connector for an 868MHz external monopole antenna

●Two LEDs:

i. Green LED LD1 to indicate the sensor power

ii. Red LED LD2 connected to port pin PD5 and connector X2/pin8 and X6/pin6 for the user application

●User button SW1 connected to port pin PD6 and to connectors X2/pin4 and X6/pin7

●Supply voltage divider connected to pin ADC0 to measure the supply voltage against the internal 1.1V

reference

●Includes the footprint for the following TWI sensor devices:

i. BMP180 air pressure sensor

ii. HTU20D / SHT20 humidity sensor

●Includes the connectors X3, X4, X5 and X6 for connecting the PCB on top of an Xplained mini or an Arduino

UNO board

3. Operating mode with an additional Xplained Pro kit for the ATA8520-EK3-E extension board using a SAMD21:

●Includes the Atmel ATA8520D SIGFOX device

●Includes the AT30TS75A temperature sensor with TWI

●Includes an ATAES132 crypto device (footprint)

●Includes an SMA antenna connector for an 868MHz external monopole antenna

●Two LEDs:

i. Green LED LD1 to indicate the sensor power

ii. Red LED LD2 connected to port pin PD5 and connector X2/pin8 and X6/pin6 for the user application

●User button SW1 connected to port pin PD6 and to connectors X2/pin4 and X6/pin7

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●Supply voltage divider connected to pin ADC0 to measure the supply voltage against the internal 1.1V

reference

●Includes the footprint for the following TWI sensor devices:

i. BMP180 air pressure sensor

ii. HTU20D / SHT20 humidity sensor

●Includes the connector X2 to for connecting the PCB to an Xplained Pro board

Figure 5-1. ATAB0101A Board

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5.1 ATA8520-EK1-E Power Consumption and Battery Selection

When using the PCB in standalone mode, the AVR®microcontroller can be set to a power-down mode while running the

Timer2 with the external 32.768kHz crystal. This will reduces the mean current consumption to ~10 to 20µA (see Table 5-1

for 5 messages per day). In this mode the sensor power is switched off and the Atmel®ATA8520D device is in OFF mode

and the MCU only wakes up by pressing the button, applying an external interrupt signal or from the internal Timer2

interrupt.

Figure 5-2 shows the typical current consumption profile from the different operating modes of the Flash application during a

telegram transmission. This allows the calculation of a mean current consumption depending on the wake-up intervals.

The shown current profile is a typical profile and depends on the Flash application of the Atmel ATmega328P device and the

attached sensors.

During the telegram transmission the MCU is performing the LED flashing to indicate activity. This increases the current

consumption and can be replaced by setting the MCU in power-down mode. When the transmission is finished an event is

generated on pin PB6 of the ATA8520D which can be used to wake-up the MCU.

Figure 5-2. Standalone Mode Current Consumption at 24°C

Table 5-1 summarizes battery service life for a typical Lithium battery which can be used with the ATAB0101A. When

selecting the battery, it is important to know the peak current consumption which has to be supplied by the battery cells. It is

assumed that the battery voltage drops from the initial value of 3V down to 2V at the end of its service life. The self-discharge

is defined by the manufacturer as typically 1% per year at an ambient temperature of 20°C.

Table 5-1. Battery Life at 20°C

Messages/Day Mean Current [mA](1)

Battery Lifetime (Days and Years)

3V Lithium Battery (1800mAh)

Days Years

140 0.421 178 0.5

100 0.301 249 0.7

50 0.151 497 1.4

20 0.061 1230 3.4

50.016 4689 12.8

Note: 1. The mean current values shown in the table are only for indication and cannot be taken as reference.

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