ATtiny817 Xplained Pro
ATtiny817 Xplained Pro
Preface
The ATtiny817 Xplained Pro evaluation kit is a hardware platform to evaluate the ATtiny817 microcontroller.
Supported by Atmel Studio and MPLAB® X integrated development platforms, the kit provides easy access to the
features of the ATtiny817 and explains how to integrate the device into a custom design.
Xplained Pro MCU series evaluation kits include on-board Embedded Debuggers. No external tools are necessary to
program or debug the ATtiny817.
Xplained Pro extension kits offer additional peripherals to extend the features of the board and ease the development
of custom designs.
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 1
ATtiny817 Xplained Pro
Table of Contents
Preface........................................................................................................................................................... 1
1.
Introduction............................................................................................................................................. 4
1.1.
1.2.
2.
Getting Started........................................................................................................................................ 6
2.1.
2.2.
3.
Getting Started with IAR.............................................................................................................23
Hardware Revision History and Known Issues..................................................................................... 25
6.1.
6.2.
6.3.
6.4.
6.5.
6.6.
7.
Power Distribution...................................................................................................................... 12
Connectors................................................................................................................................. 12
Peripherals................................................................................................................................. 15
Embedded Debugger Implementation........................................................................................16
Kit Modifications......................................................................................................................... 19
Appendix............................................................................................................................................... 23
5.1.
6.
Embedded Debugger................................................................................................................... 7
Xplained Pro Analog Module (XAM).............................................................................................8
Hardware Identification System....................................................................................................9
Power Sources........................................................................................................................... 10
Xplained Pro Headers and Connectors......................................................................................10
Hardware User Guide........................................................................................................................... 12
4.1.
4.2.
4.3.
4.4.
4.5.
5.
Xplained Pro Quick Start.............................................................................................................. 6
Design Documentation and Relevant Links................................................................................. 6
Xplained Pro............................................................................................................................................7
3.1.
3.2.
3.3.
3.4.
3.5.
4.
Features....................................................................................................................................... 4
Kit Overview................................................................................................................................. 4
Identifying Product ID and Revision........................................................................................... 25
Revision 8...................................................................................................................................25
Revision 7...................................................................................................................................25
Revision 6...................................................................................................................................25
Revision 5...................................................................................................................................25
Revision 4...................................................................................................................................25
Document Revision History...................................................................................................................26
The Microchip Website.................................................................................................................................27
Product Change Notification Service............................................................................................................27
Customer Support........................................................................................................................................ 27
Microchip Devices Code Protection Feature................................................................................................ 27
Legal Notice................................................................................................................................................. 27
Trademarks.................................................................................................................................................. 28
Quality Management System....................................................................................................................... 28
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 2
ATtiny817 Xplained Pro
Worldwide Sales and Service.......................................................................................................................29
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User Guide
DS50002684B-page 3
ATtiny817 Xplained Pro
Introduction
1.
Introduction
1.1
Features
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1.2
ATtiny817 Microcontroller
Two Mechanical User Buttons
Two QTouch® Buttons
One Yellow User LED
32.768 kHz Crystal
Two Xplained Pro Extension Headers
Embedded Debugger
– Auto-ID for board identification in Atmel Studio/MPLAB® X
– One yellow status LED
– One green board power LED
– Symbolic debug of complex data types including scope information
– Programming and debugging, including power measurements
– Data gateway interface: SPI, I2C, two GPIOs
– Virtual COM port (CDC)
Embedded Current Measurement Circuitry (XAM)
– Measures power consumption of the ATtiny817 and/or peripherals
– Measures current between 100 nA And 400 mA
– Current measurement data are shown in microchip Data Visualizer
USB Powered
Supported With Application Examples In Atmel START
Kit Overview
The ATtiny817 Xplained Pro evaluation kit is a hardware platform to evaluate the ATtiny817.
The kit offers a set of features that enables the ATtiny817 user to get started with the ATtiny817 peripherals right
away and to get an understanding of how to integrate the device into their design.
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 4
ATtiny817 Xplained Pro
Introduction
Figure 1-1. ATtiny817 Xplained Pro Evaluation Kit Overview
CURRENT MEASUREMENT
HEADER
SW0 USER BUTTON
SW1 USER BUTTON
DEBUG USB
USER LED0
POWER
HEADER
UPDI DEBUG
FOR EXTERNAL
DEBUGGER
MCU CURRENT
MEASUREMENT
SELECT JUMPER
I/O CURRENT
MEASUREMENT
SELECT JUMPER
ATTINY817
EXTENSION 1
HEADER
QTOUCH® BUTTONS
32.768 kHz
CRYSTAL
EXTENSION 3
HEADER
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User Guide
DS50002684B-page 5
ATtiny817 Xplained Pro
Getting Started
2.
Getting Started
2.1
Xplained Pro Quick Start
Steps to start exploring the Xplained Pro platform:
1. Download and install Atmel Studio/MPLAB® X.
2. Launch Atmel Studio/MPLAB® X.
3. Connect the Debug USB port on the evaluation kit to the computer using a USB cable (Standard-A to Micro-B
or Micro-AB).
When the Xplained Pro MCU kit is connected to the computer for the first time, the operating system installs the
driver software automatically. This driver supports 32-bit and 64-bit versions of Microsoft® Windows® XP, Windows
Vista®, Windows 7, Windows 8, Windows 10, and Windows Server 2012.
When the Xplained Pro MCU board is powered, the power LED (green) glows, and Atmel Studio/MPLAB® X
automatically detects the specific Xplained Pro MCU and extension board(s) that are connected. The landing page of
the kit in the Atmel Studio has an option to launch the Atmel Software Framework (ASF) and the Atmel START
example application codes for the kit. The ATtiny817 device is programmed and debugged by the on-board
embedded debugger and, therefore, no external programmer or debugger tool is required.
2.2
Design Documentation and Relevant Links
The following list contains links to the most relevant documents and software for the ATtiny817 Xplained Pro.
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•
•
•
•
•
•
•
•
•
•
Xplained Products - Xplained Evaluation Kits are a series of easy-to-use evaluation kits for Microchip
microcontrollers and other Microchip products.
– Xplained Nano - used for low pin count devices and provides a minimalistic solution with access to all I/O
pins of the target microcontroller.
– Xplained Mini - used for medium pin count devices and adds Arduino Uno compatible header footprint and
a prototyping area.
– Xplained Pro - used for medium-to-high pin count devices that feature advanced debugging and
standardized extensions for peripheral functions.
Note: All the above kits have on-board programmers/debuggers, which creates a set of low-cost boards for
evaluation and demonstration of features and capabilities of different Microchip products.
Atmel Studio - Free IDE for the development of C/C++ and assembler code for microcontrollers.
MPLAB® X IDE - MPLAB® X IDE is a software program that runs on a PC (Windows®, Mac OS®, Linux®) to
develop applications for Microchip microcontrollers and digital signal controllers. It is called an Integrated
Development Environment (IDE) because it provides a single integrated “environment” to develop code for
embedded microcontrollers.
Atmel START - Atmel START is an online tool that helps the user to select and configure software components
and tailor your embedded application in a usable and optimized manner.
EDBG User Guide - User guide containing more information about the on-board Embedded Debugger.
IAR Embedded Workbench® for AVR® - This is a commercial C/C++ compiler that is available for 8-bit AVR.
There is a 30-day evaluation version as well as a 4 KB code-size-limited kick-start version available from their
website.
QTouch® Tools - A collection of tools to design capacitive touch applications.
QTouch® Design Guide - PTC Robustness design guide document for touch sensor development.
Data Visualizer - Data Visualizer is a program used for processing and visualizing data. The Data Visualizer
can receive data from various sources such as serial ports and on-board debugger’s Data Gateway Interface as
found on Curiosity Nano and Xplained Pro boards.
ATtiny817 Xplained Pro website - Kit information, latest user guide and design documentation.
ATtiny817 Xplained Pro on Microchip Direct - Purchase this kit on Microchip Direct.
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User Guide
DS50002684B-page 6
ATtiny817 Xplained Pro
Xplained Pro
3.
Xplained Pro
Xplained Pro is an evaluation platform containing a series of microcontroller boards (evaluation kits) and extension
boards. Atmel Studio/MPLAB® X is used to program and debug the microcontrollers on these boards. Atmel Studio
includes Advanced Software Framework (ASF) and Atmel START, which has drivers and demo code, and Data
Visualizer, which supports data streaming and advanced debugging. Xplained Pro evaluation kits can be connected
to a wide range of Xplained Pro extension boards through standardized headers and connectors. Xplained Pro
extension boards have identification (ID) chips to uniquely identify which boards are connected to the Xplained Pro
evaluation kits.
3.1
Embedded Debugger
The ATtiny817 Xplained Pro contains an Embedded Debugger (EDBG) for on-board debugging. The EDBG is a USB
composite device with the following interfaces:
•
•
•
Debugger
Virtual COM Port
Data Gateway Interface (DGI)
The EDBG can program and debug the ATtiny817 with the help of Atmel Studio/MPLAB® X. The UPDI interface is
connected between the EDBG and the ATtiny817 on the ATtiny817 Xplained Pro.
The Virtual COM Port is connected to a UART on the ATtiny817 and provides an easy way to communicate with the
target application through terminal software. It offers variable baud rate, parity, and stop bit settings. The settings on
the ATtiny817 must match the settings given in the terminal software.
Info: The Virtual COM Port in the EDBG requires the terminal software to set the Data Terminal Ready
(DTR) signal to enable the UART pins connected to the ATtiny817. If the DTR signal is not enabled, the
UART pins on the EDBG are kept in tri-state (high-Z) to render the COM Port not usable. The DTR signal
is automatically set by terminal software, but it may have to be manually enabled in your terminal.
The DGI consists of several physical interfaces for bidirectional communication with the host computer.
Communication over the interfaces is bidirectional. It can be used to send event values and data from the ATtiny817.
Traffic over the interfaces can be timestamped by the EDBG for more accurate tracking of events, but timestamping
reduces the maximal data throughput. The Data Visualizer is used to send and receive data through DGI.
The EDBG controls two LEDs on the ATtiny817 Xplained Pro; a power LED and a status LED. The following table
provides details on how the LEDs are controlled in different operation modes.
Table 3-1. EDBG LED Control
Mode
Power LED
Status LED
Normal mode
The power LED is ON when power is Activity indicator, the LED flashes
applied to the board.
when any communication happens to
the EDBG.
Bootloader mode (idle)
The power LED and the status LED blink simultaneously.
Bootloader mode (firmware upgrade) The power LED and the status LED blink in an alternating pattern.
For additional information on the EDBG, see the EDBG User Guide.
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 7
ATtiny817 Xplained Pro
Xplained Pro
3.2
Xplained Pro Analog Module (XAM)
3.2.1
Overview
The Xplained Pro Analog Module (XAM) extends the embedded debugger with a high dynamic range current
measurement. This enables power profiling of the target system.
Current output
Figure 3-1. XAM Block Diagram
Calibration
circuitry
GPIO(s)
Control MCU
Sync
GPIO
I2C
Calibration ON/OFF
GPIO
EDBG
SPI
Clock sync
Range selection
voltage
reference
2.7V
SWD
AREF
100 Ohm
100 mOhm
Pre-amplifier
2x
ADC0
ADC1
20x20x
S&H
ADC
16x
GND
Active filter with
gain
Current input
GPIO
Xplained Pro Analog Module (XAM)
The XAM consists of:
•
•
•
•
Calibration Circuitry
Voltage Reference Circuitry
Analog Front-End:
– Shunt resistors with a range selection switch
– Pre-amplifier
– Two active filters with gain
Control MCU
– Analog-to-Digital converter
– Signal processing
– Control/communication interface to the EDBG
The current measurement front-end is a high side shunt measurement with a pre-amplifier and a second active filter
stage with gain, as shown in Figure 3-1. The wide dynamic range is achieved by four measurement ranges, which
are defined by two shunt resistors and the two parallel second stage active filters with gain.
3.2.2
EDBG Interface
The XAM is connected to the EDBG with the following interfaces:
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•
•
•
I2C: This is used to control and configure the XAM.
SPI: Current measurement data is streamed to the EDBG via this interface. This is a unidirectional channel from
the XAM to the EDBG.
SWD: The MCU in the XAM is programmed via SWD from the EDBG.
Clock sync: Signal used to synchronize ADC measurements with the EDBG.
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User Guide
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ATtiny817 Xplained Pro
Xplained Pro
•
3.2.3
Reference clock: Reference clock for the XAM.
Sample Rate
The raw sampling rate of the XAM is up to 250 kHz, and with the default averaging configuration (average of 16
samples), the actual output of the XAM is 16.67 ksps.
Info: The XAM output sample rate is not an integer fraction of the raw sampling.
3.2.4
Measurement Ranges and Accuracy
The XAM has four measurement ranges. These are defined by two shunt resistors and two gain stages.
Table 3-2. XAM Measurement Ranges and Accuracy
Measurement
Range
Hardware
Resolution Accuracy
Comments
Range 1
Low current shunt and high
gain stage
20 nA
1 LSB ±1% Accuracy will decrease below 1
μA. The typical accuracy for 300
nA is 1 LSB ±10%.
Range 2
Low current shunt and low
gain stage
150 nA
1 LSB ±1%
Range 3
High current shunt and high
gain stage
10 μA
1 LSB ±1%
Range 4
High current shunt and low
gain stage
100 μA
1 LSB ±1% Accuracy will decrease above 100
mA. Typical accuracy is 1 LSB
±5% at 400 mA. The maximum
current is 400 mA.
The ranges are automatically switched by the XAM to achieve the best measurement results, and the currently active
range is visualized in the Data Visualizer front-end tool. The maximum voltage drop over the shunt resistor is 100 mV,
and the XAM switches the range automatically before reaching this limit.
3.3
Hardware Identification System
All Xplained Pro extension boards come with an identification chip (ATSHA204A CryptoAuthentication™ chip) to
uniquely identify the boards that are connected to the Xplained Pro Evaluation Kit. This chip contains information that
identifies the extension with its name and some extra data. When an Xplained Pro extension is connected to an
Xplained Pro Evaluation Kit, the information is read and sent to the Atmel Studio/MPLAB® X. The following table
shows the data fields stored in the ID chip with example content.
Table 3-3. Xplained Pro ID Chip Content
Data Field
Data Type
Example Content
Manufacturer
ASCII string
Microchip'\0'
Product name
ASCII string
Segment LCD1 Xplained Pro'\0'
Product revision
ASCII string
02'\0'
Product serial number
ASCII string
1774020200000010’\0’
Minimum voltage [mV]
uint16_t
3000
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User Guide
DS50002684B-page 9
ATtiny817 Xplained Pro
Xplained Pro
...........continued
3.4
Data Field
Data Type
Example Content
Maximum voltage [mV]
uint16_t
3600
Maximum current [mA]
uint16_t
30
Power Sources
The ATtiny817 Xplained Pro kit can be powered by several power sources, as listed in the following table.
Table 3-4. Power Sources for ATtiny817 Xplained Pro
Power Source
Voltage Requirements
Current Requirements
Connector Marking
External power
5V ±2% (±100 mV) for USB The recommended value
host operation. 4.3V to
for the maximum current is
5.5V if a USB host
2A.
operation is not required.
PWR
Embedded debugger USB
4.4V to 5.25V (according to 500 mA (according to USB
USB specification)
specification)
DEBUG USB
The kit automatically detects the available power sources and chooses which to use according to the following
priority:
1.
2.
External power.
Embedded debugger USB.
Info: External power is required when 500 mA from a USB connector is not enough to power the board
with possible extension boards.
3.5
Xplained Pro Headers and Connectors
3.5.1
Xplained Pro Standard Extension Header
All Xplained Pro kits have many dual-row, 20-pin, 100 mil extension headers. The Xplained Pro MCU boards have
male headers, while the Xplained Pro extensions have their female counterparts. The following table provides the pin
description of all the connected pins.
Info: Not all pins are always connected to all extension headers.
The extension headers can be used to connect a variety of Xplained Pro extensions to Xplained Pro MCU boards or
to access the pins of the target microcontroller on the Xplained Pro boards.
Table 3-5. Xplained Pro Standard Extension Header
Pin Number
Pin Name
Description
1
ID
Pin to communicate with the ID chip on an extension board.
2
GND
Ground.
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User Guide
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ATtiny817 Xplained Pro
Xplained Pro
...........continued
Pin Number
3.5.2
Pin Name
Description
3
ADC(+)
Analog-to-Digital Converter; alternatively, a pin for the positive terminal of a
differential ADC.
4
ADC(-)
Analog-to-Digital Converter; alternatively, a pin for the negative terminal of a
differential ADC.
5
GPIO1
General purpose I/O pin.
6
GPIO2
General purpose I/O pin.
7
PWM(+)
Pulse-Width Modulation; alternatively, a pin for the positive part of a
differential PWM.
8
PWM(-)
Pulse-Width Modulation; alternatively, a pin for the negative part of a
differential PWM.
9
IRQ/GPIO
Interrupt request pin and/or general purpose I/O pin.
10
SPI_SS_B/GPIO
Slave select pin for Serial Peripheral Interface (SPI) and/or general purpose
I/O pin.
11
I2C_SDA
Data pin for I2C interface. Always connected, bus type.
12
I2C_SCL
Clock pin for I2C interface. Always connected, bus type.
13
UART_RX
Receiver pin of target device UART.
14
UART_TX
Transmitter pin of target device UART.
15
SPI_SS_A
Slave select for SPI. This pin should preferably not be connected to anything
else.
16
SPI_MOSI
SPI master out slave in pin. Always connected, bus type.
17
SPI_MISO
SPI master in slave out pin. Always connected, bus type.
18
SPI_SCK
SPI clock pin. Always connected, bus type.
19
GND
Ground pin for extension boards.
20
VCC
Power pin for extension boards.
Xplained Pro Power Header
The power header can be used to connect external power to the ATtiny817 Xplained Pro kit. The kit automatically
detects and switches to an external power source, if supplied. The power header can also be used to supply power to
external peripherals or extension boards. Ensure that the total current does not exceed the recommended current
limit of the on-board regulator when using the 3.3V pin.
Table 3-6. Xplained Pro Power Header
Pin Number
Pin Name
Description
1
VEXT_P5V0
External 5V input pin
2
GND
Ground pin
3
VCC_P5V0
Unregulated 5V pin (an output, derived from one of the input
sources)
4
VCC_P3V3
Regulated 3.3V pin (an output, used as the main power
supply for the kit)
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 11
ATtiny817 Xplained Pro
Hardware User Guide
4.
Hardware User Guide
4.1
Power Distribution
ATtiny817 Xplained Pro has two power sources; EDBG USB and external 5.0V. The kit will automatically select the
source to draw power from. The kit has two on-board 3.3V voltage regulators, one for the EDBG and XAM, and one
for the ATtiny817 and other peripherals.
Figure 4-1. Power Supply Block Diagram
VCC_P5V0
EDBG and XAM
Regulator 3.3V
Auto MUX
External 5V
input
EDBG USB
VCC_P3V3
Regulator 3.3V
Power
Measurement
Select
VCC_MCU
Jumper
Power converter
ATtiny817
Power consumer
Power source
Peripherals
Power switch
VCC_TARGET
4.2
Connectors
The following sections describe the implementation of the relevant connectors and headers on the ATtiny817
Xplained Pro and their connection to the ATtiny817. The tables of connections in the sections also describe which
signals are shared between the headers and on-board functionality. The figure below shows all available connectors
and jumpers on ATtiny817 Xplained Pro.
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 12
ATtiny817 Xplained Pro
Hardware User Guide
Figure 4-2. ATtiny817 Xplained Pro Connector Overview
4.2.1
Xplained Pro Standard Extension Headers
The ATtiny817 Xplained Pro headers EXT1 and EXT3 offer access to the I/O of the microcontroller to expand the
board, e.g., by connecting extensions to the board. These headers are based on the standard extension header
specified in the table below. The headers have a pitch of 2.54 mm.
Table 4-1. Extension Header EXT1
EXT1 Pin
ATtiny817 Pin
Function
Shared Functionality
1 [ID]
-
-
Communication line to the ID chip on an extension board
2 [GND]
-
-
Ground
3 [ADC(+)]
PA6
AIN6
QTouch Button 1
4 [ADC(-)]
PA7
AIN7
QTouch Button 2
5 [GPIO1]
PB7
GPIO
-
6 [GPIO2]
PB4
GPIO
LED0
7 [PWM(+)]
PB0
TC/W0
-
8 [PWM(-)]
PB1
TC/W1
-
9 [IRQ/GPIO]
PA5
IRQ/GPIO
-
10 [SPI_SS_B/GPIO]
PA4
GPIO
-
11 [I²C_SDA]
PA1
I²C SDA
EXT3 and EDBG I²C
12 [I²C_SCL]
PA2
I²C SCL
EXT3 and EDBG I²C
13 [USART_RX]
PB3
UART RX
EXT3, EDBG CDC, and Crystal (1)
14 [USART_TX]
PB2
UART TX
EXT3, EDBG CDC, and Crystal (1)
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User Guide
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ATtiny817 Xplained Pro
Hardware User Guide
...........continued
EXT1 Pin
ATtiny817 Pin
Function
Shared Functionality
15 [SPI_SS_A]
PC3
SPI SS
-
16 [SPI_MOSI]
PC2
SPI MOSI
EXT3 and EDBG SPI
17 [SPI_MISO]
PC1
SPI MISO
EXT3 and EDBG SPI
18 [SPI_SCK]
PC0
SPI SCK
EXT3 and EDBG SPI
19 [GND]
-
-
Ground
20 [VCC]
-
-
Power for extension board
1) Not connected by default, see 4.5.1 Connecting the 32.768 kHz Crystal for more information.
Note: Signal functions in italic use alternative pin location. These have to be configured in the PORTMUX register of
the device.
Table 4-2. Extension Header EXT3
EXT3 Pin
ATtiny817 Pin Function
Shared Functionality
1 [ID]
-
-
Communication line to the ID chip on an extension board
2 [GND]
-
-
Ground
3 [ADC(+)]
-
-
4 [ADC(-)]
-
-
5 [GPIO1]
PC5
GPIO
6 [GPIO2]
-
-
7 [PWM(+)]
-
-
8 [PWM(-)]
-
-
9 [IRQ/GPIO]
PB6
IRQ/GPIO
EDBG DGI
10 [SPI_SS_B/GPIO] PB5
GPIO
SW0 and EDBG DGI
11 [I²C_SDA]
PA1
I²C SDA
EXT1 and EDBG I²C
12 [I²C_SCL]
PA2
I²C SCL
EXT1 and EDBG I²C
13 [USART_RX]
PB3
UART RX
EXT1, EDBG CDC, and Crystal (1)
14 [USART_TX]
PB2
UART TX
EXT1, EDBG CDC, and Crystal (1)
15 [SPI_SS_A]
PA3
GPIO / SPI_SS -
16 [SPI_MOSI]
PC2
SPI MOSI
EXT1 and EDBG SPI
17 [SPI_MISO]
PC1
SPI MISO
EXT1 and EDBG SPI
18 [SPI_SCK]
PC0
SPI SCK
EXT1 and EDBG SPI
19 [GND]
-
-
Ground
20 [VCC]
-
-
Power for extension board
SW1 and UPDI debug connector
1) Not connected by default, see 4.5.1 Connecting the 32.768 kHz Crystal for more information.
Note: Signal functions in italic use alternative pin location. These have to be configured in the PORTMUX register of
the device.
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User Guide
DS50002684B-page 14
ATtiny817 Xplained Pro
Hardware User Guide
4.2.2
UPDI Debug Connector
ATtiny817 Xplained Pro has a 10-pin 50-mil UPDI Debug Connector that can be used to attach external debuggers to
the ATtiny817.
Table 4-3. UPDI Debug Connector
UPDI Debug Connector
Pin
Pin/Net
Function
Shared Functionality
1
-
-
2
GND
Ground
3
PA0
UPDI/RESET
4
VCC_TARGET_P3V3
ATtiny817 voltage
5
-
-
6
PC5
-
7
-
-
8
-
-
9
-
-
10
-
-
EDBG
SW1 and EXT3
Note:
1. PA0 is by default configured as UPDI. PA0 can be fused to be RESET or GPIO, but this is prevented by the
EDBG, as this will disable all further programming and debugging by the EDBG.
2. Even though PC5 is connected to the UPDI debug connector, this pin is not used for programming or
debugging.
4.3
Peripherals
4.3.1
Mechanical Buttons
ATtiny817 Xplained Pro contains two generic user-configurable mechanical buttons. When a button is pressed, it will
drive the I/O line to GND.
Info: There is no pull-up resistor connected to the generic user button SW0. Remember to enable the
internal pull-up in the ATtiny817 to use the button. There is an on-board pull-up resistor connected to the
generic user button SW1. There is no need to enable the internal pull-up in the ATtiny817 to use the
button.
Table 4-4. Mechanical Buttons
ATtiny817 Pin
Silkscreen Text
Shared Functionality
PB5
SW0
EXT3 and EDBG DGI
PC5
SW1/RST
EXT3 and UPDI debug connector
Info: PC5 is connected to a button that states “SW1/RST” because PC5 had reset capabilities in an early
version of the ATtiny817. Today the ATtiny817 does not have any reset capabilities on PC5.
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 15
ATtiny817 Xplained Pro
Hardware User Guide
4.3.2
Crystal
The ATtiny817 Xplained Pro kit contains a 32.768 kHz crystal, which can be used as a clock source for the ATtiny817
device. The crystal has a cut-strap next to it, which can be used to measure the oscillator safety factor. This is done
by cutting the strap and adding a resistor across the strap. More information about oscillator allowance and safety
factor can be found in the AN2648 application note from Microchip.
There is a 9 pF, 32.768 kHz crystal in a 3.2 mm by 1.5 mm package mounted on ATtiny817 Xplained Pro.
Info: The crystal is not connected to the device by default, as the crystal pins on the device are shared
with the UART module. If the crystal is needed by the application, the UART interface is lost. See 4.5 Kit
Modifications for instructions on how to modify the kit for crystal operation.
Table 4-5. External 32.768 kHz Crystal
ATtiny817 Pin
Function
PB2
XOUT32
PB3
XIN32
Related Links
2.2 Design Documentation and Relevant Links
4.3.3
LED
There is one yellow LED available on the ATtiny817 Xplained Pro board that can be turned ON and OFF. The LED
can be activated by connecting the I/O line to GND.
Table 4-6. LED Connection
4.3.4
ATtiny817 Pin
Silkscreen Text
Shared Functionality
PB4
LED0
EXT1
QTouch® Button
There are two self-capacitance buttons available on the ATtiny817 Xplained Pro board, which can be used as input
buttons for an application. These QTouch buttons are intended to be driven by the built-in Peripheral Touch Controller
(PTC) of the device.
To get started using the QTouch buttons and the PTC, open the QTouch Tiny817 Xplained Pro Selfcap Example in
Atmel Start (http://start.atmel.com/#examples).
Tip: The touch buttons in the kit are placed on the inner layers of the PCB and have a very small overlay.
Due to the short distance from the sensor to the touch area, it might be oversensitive. Different overlays
can be used to avoid saturation of the sensor.
Table 4-7. QTouch® Connection
4.4
ATtiny817 Pin
Silkscreen Text
Shared Functionality
PA7
QT BTN1
EXT1
PA6
QT BTN2
EXT1
Embedded Debugger Implementation
The ATtiny817 Xplained Pro contains an Embedded Debugger (EDBG), which can be used to program and debug
the ATtiny817 using Unified Program Debug Interface (UPDI). The Embedded Debugger also includes a Virtual COM
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 16
ATtiny817 Xplained Pro
Hardware User Guide
Port interface over UART, a Data Gateway Interface over SPI, I2C, and two ATtiny817 GPIOs. The kit also includes
an XAM extension processor to the Embedded Debugger for on-board current measurement. Atmel Studio/MPLAB®
X can be used as a front-end for the Embedded Debugger.
4.4.1
Unified Program Debug Interface
The Unified Program Debug Interface (UPDI) uses one pin to communicate with the target. For further information on
how to use the programming and debugging capabilities of the EDBG, see section 3.1 Embedded Debugger.
Table 4-8. UPDI Connections
4.4.2
ATtiny817 Pin
Function
Shared Functionality
PA0
UPDI interface
UPDI debug connector
Virtual COM Port
The Embedded Debugger acts as a Virtual COM Port gateway by using one of the ATtiny817 UARTs. For further
information on how to use the Virtual COM Port, see section 3.1 Embedded Debugger.
Table 4-9. Virtual COM Port Connections
4.4.3
ATtiny817 Pin
Function
Shared Functionality
PB2
UART TXD (ATtiny817 TX line)
EXT1 and EXT3
PB3
UART RXD (ATtiny817 RX line)
EXT1 and EXT3
Data Gateway Interface
The Embedded Debugger features a Data Gateway Interface (DGI) by using either an SPI or I²C. The DGI can be
used to send a variety of data from the ATtiny817 to the host PC. For further information on how to use the DGI
interface, see the Data Visualizer and the EDBG User Guide.
Table 4-10. DGI Interface Connections when using SPI
ATtiny817 Pin
Function
Shared Functionality
PC4
SPI SS (Slave select) (ATtiny817 is Master)
-
PC2
SPI MOSI (Master Out, Slave in)
EXT1 and EXT3
PC1
SPI MISO (Master In, Slave Out)
EXT1 and EXT3
PC0
SPI SCK (Clock Out)
EXT1 and EXT3
Table 4-11. DGI Interface Connections when using I²C
ATtiny817 Pin
Function
Shared Functionality
PA1
I2C
SDA (Data line)
EXT1 and EXT3
PA2
I2C SCL (Clock line)
EXT1 and EXT3
Note: Signal functions in italic use alternative pin location. These have to be configured in the PORTMUX register of
the device.
Two GPIO lines are connected to the Embedded Debugger. The EDBG can monitor these lines and timestamp pin
value changes. This makes it possible to accurately timestamp events in the ATtiny817 application code. For further
information on how to configure and use the GPIO monitoring features, see the Data Visualizer and the EDBG User
Guide.
Table 4-12. GPIO Lines Connected to the EDBG
ATtiny817 Pin
Function
Shared Functionality
PB5
GPIO0
EXT3 and SW0
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ATtiny817 Xplained Pro
Hardware User Guide
...........continued
4.4.4
ATtiny817 Pin
Function
Shared Functionality
PB6
GPIO1
EXT3
XAM Configuration
On the ATtiny817 Xplained Pro, the MCU and the MCU peripherals (e.g., extensions) are powered by their own
regulator, as shown in the figure below. All the other parts of the board, mainly the embedded debugger and the
accompanying Xplained Pro Analog Module (XAM), are powered from a separate regulator. The current to the MCU
and the peripherals can be measured by connecting them to the XAM output through jumper settings.
Figure 4-3. ATtiny817 Xplained Pro XAM Implementation Block Diagram
Xplained Pro MCU power
measurement jumper
Target
Peripherals
Target MCU
Current measurement
bypass jumper selection
Xplained Pro Analog
Module (XAM)
Target
Regulator
On the ATtiny817 Xplained Pro the XAM can be used in four configurations:
1. No current measurement or external MCU current measurement: The XAM is bypassed, and thus the
MCU and peripherals are supplied directly by the regulator. Set both jumpers in the “BYPASS” position. In this
configuration, it is also possible to connect external measurement tools on the Xplained Pro MCU power
measurement header to measure the MCU current directly instead of using the XAM.
2. MCU current measurement: The XAM measures only the MCU current while the peripherals are supplied
directly by the regulator. For this configuration, place the jumper for “I/O” (peripherals) into the “BYPASS”
position and the “MCU” into the “MEASURE” position.
3. Peripherals measurement: The XAM measures only the peripherals’ current while the MCU is directly
supplied by the regulator. For this configuration, place the jumper for “MCU” into the “BYPASS” position and
the “I/O” jumper into the “MEASURE” position.
4. MCU and peripherals measurement: In this configuration, both the MCU and the peripherals are measured
by the XAM. Place both jumpers on the “I/O” and “MCU” headers in the “MEASURE” position.
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 18
ATtiny817 Xplained Pro
Hardware User Guide
4.5
Kit Modifications
ATtiny817 Xplained Pro has several resistors that can be used to disconnect I/O pins of the ATtiny817 from
connectors and on-board ICs and to disconnect power signals.
Info: Note that some resistors aren't mounted by default on the kit. They are listed in the table below.
Table 4-13. Kit Modifications
Designat Value
or
Mounted
From
To
Comment
J100
cut-strap
N/A
VCC_P3V3
VCC_P3V3_CM_IN
ATtiny817, peripherals, and
connectors power supply
R107
0R
Yes
U100 OUT
VCC_CM_P3V3
XAM power supply
R108
0R
Yes
U100 OUT
VCC_EDBG_P3V3
EDBG power supply
R302
10k
Yes
QT BTN1
PA6 AIN6
R305
10k
Yes
QT BTN2
PA7 AIN7
On-board QTouch buttons to the
ATtiny817
R307
0R
Yes
PB2 UART TXD
PB2
R308
0R
Yes
PB3 UART RXD
PB3
EDBG CDC and UART on
extension headers to the
ATtiny817
R309
0R
Yes
SW1
PC5
Mechanical button SW1
R312
0R
No
PB3 TOSC1
PB3
R313
0R
No
PB2 TOSC2
PB2
32.768 kHz crystal to the
ATtiny817
R404
0R
Yes
EDBG UPDI
PA0 UDPI RST
Debug interface from the EDBG
to the ATtiny817
R406
0R
Yes
EDBG CDC RX
PB2 UART TX
EDBG CDC and DGI interfaces
to the ATtiny817
I2C
R407
0R
Yes
EDBG
R408
0R
Yes
EDBG I2C SCL
PA2 I2C SCL
R414
330R
Yes
EDBG CDC TX
PB3 UART RX
R415
0R
Yes
EDBG SPI MOSI
PC2 SPI MOSI
R416
330R
Yes
EDBG DGI_GPIO0
PB5 GPIO
R417
330R
Yes
EDBG DGI_GPIO1
PB6 IRQ GPIO
R420
330R
Yes
EDBG SPI MISO
PC1 SPI MISO
R425
0R
Yes
EDBG SPI SCK
PC0 SPI SCK
R426
0R
Yes
EDBG SS
PC4 SPI SS
© 2020 Microchip Technology Inc.
SDA
PA1
I2C
SDA
User Guide
DS50002684B-page 19
ATtiny817 Xplained Pro
Hardware User Guide
Figure 4-4. Assembly Drawing, Top
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 20
ATtiny817 Xplained Pro
Hardware User Guide
Figure 4-5. Assembly Drawing, Bottom
4.5.1
Connecting the 32.768 kHz Crystal
The ATtiny817 Xplained Pro board has a 32.768 Hz crystal mounted on the kit. By default, the crystal is not
connected as the TOSC pins on the device are used for UART communication to the extension headers and the
EDBG CDC. To use the crystal, this connection has to be broken to get a functional crystal operation.
To connect the crystal, remove resistors R307 and R308, and place them on the footprints for R312 and R313. To
locate the components, see the assembly drawing in the section above (Kit Modifications).
Info: Operating the ATtiny817 with the crystal requires physical modifications on the kit using a soldering
iron.
4.5.2
Operation at Other Voltages
The ATtiny817 Xplained Pro board is by default operated at 3.3V, but it also has the possibility of running at other
voltages from an external supply. The EDBG is designed to run from a 3.3V supply and won't work with other
voltages, therefore all connections from the EDBG and the on-board 3.3V regulator to the ATtiny817 should be
removed.
To completely disconnect the EDBG and the on-board power supply from the ATtiny817, do the following:
© 2020 Microchip Technology Inc.
User Guide
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ATtiny817 Xplained Pro
Hardware User Guide
•
•
•
Remove the two jumpers from the on-board 3-pin current measurement headers (J101 and J102), and connect
the two center pins (pin 2) with a wire or an ammeter, as shown in Figure 4-7
Remove R404, R406, R407, R408, R414, R415, R416, R417, R420, R425, and R426
Optionally, cut J100 to remove power to the on-board current measurement headers (J101 and J102) from the
on-board regulator
Figure 4-6 shows all components that have to be removed from the bottom side of the PCB for operation at other
voltages. To locate the other components, see the assembly drawing in the section above. When the components are
removed, the kit can be supplied with the desired voltage through the pins marked 3.3V (pin four) and GND (pin two)
on the Xplained Pro power header. To program and debug the ATtiny817, the 2x5 50 mil UPDI debug connector has
to be used with an external debugger.
Info: Operating the ATtiny817 with other voltages than 3.3V requires physical modifications on the kit
using a soldering iron and an external debugger for programming the ATtiny817. The on-board current
measurement works only at 3.3V. The on-board LED is selected for 3.3V operation. The light level at 1.8V
operation is very low. To increase the emitted light level, the value of the series resistor can be lowered.
The EDBG functionality can be restored by re-soldering the removed components. If J100 is cut, a 0Ω
resistor can be soldered across the cut.
CAUTION
The voltage supplied through the power header is applied directly to the ATtiny817 and the extension
headers. Applying a voltage higher than 5.5V may damage the board permanently.
Figure 4-6. ATtiny817 Xplained Pro EDBG Disconnect
EDBG UPDI , I2C,
GPIO, CDC, and
SPI disconnect
Figure 4-7. ATtiny817 Xplained Pro Current Measurement Headers
Related Links
3.5.2 Xplained Pro Power Header
4.2.2 UPDI Debug Connector
4.2 Connectors
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 22
ATtiny817 Xplained Pro
Appendix
5.
5.1
Appendix
Getting Started with IAR
IAR Embedded Workbench® for AVR® is a proprietary high-efficiency compiler not based on GCC. Programming and
debugging of ATtiny817 Xplained Pro is supported in IAR™ Embedded Workbench for AVR using the Atmel-ICE
interface. Some initial settings must be set up in the project to get the programming and debugging to work.
The following steps will explain how to get your project ready for programming and debugging:
1.
2.
3.
4.
Make sure you have opened the project you want to configure. Open the OPTIONS dialog for the project.
In the category General Options, select the Target tab. Select the device for the project, or if not listed, the
core of the device, as shown in Figure 7-7.
In the category Debugger, select the Setup tab. Select Atmel-ICE as the driver, as shown in Figure 7-8.
In the category Debugger > Atmel-ICE, select the Atmel-ICE 1 tab. Select UPDI as the interface and,
optionally, select the UPDI frequency, as shown in Figure 7-9.
Info: If the selection of Debug Port (mentioned in step 4) is grayed out, the interface is preselected, and
the user can skip this configuration step.
Figure 5-1. Select Target Device
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 23
ATtiny817 Xplained Pro
Appendix
Figure 5-2. Select Debugger
Figure 5-3. Configure Interface
© 2020 Microchip Technology Inc.
User Guide
DS50002684B-page 24
ATtiny817 Xplained Pro
Hardware Revision History and Known Issues
6.
Hardware Revision History and Known Issues
This user guide is written to provide information about the latest available revision of the board. The following
sections contains information about known issues, a revision history of older revisions, and how older revisions differ
from the latest revision.
6.1
Identifying Product ID and Revision
There are two ways to find the revision and product identifier of the Xplained Pro boards: either through Atmel Studio/
MPLAB® X or by looking at the sticker on the bottom side of the PCB.
When an Xplained Pro MCU board is connected to a computer with Atmel Studio/MPLAB® X running, an information
window with the serial number is shown. The first six digits of the serial number contain the product identifier and
revision. Information about connected Xplained Pro extension boards is also shown in the window.
The same information can be found on the sticker on the bottom side of the PCB. Most kits have stickers that have
the identifier and revision printed in plain text as A09-nnnn/rr, where nnnn is the identifier, and rr is the revision.
Boards with limited space have a sticker with only a data matrix code, which contains a serial number string.
The serial number string has the following format:
"nnnnrrssssssssss"
n = product identifier
r = revision
s = serial number
The product identifier for the ATtiny817 Xplained Pro is A09-2654.
6.2
Revision 8
32.768 kHz crystal manufacturer changed.
6.3
Revision 7
Atmel logo replaced with Microchip logo on PCB.
6.4
Revision 6
Revision 6 is identical to revision 4 and revision 5 with improved test coverage.
6.5
Revision 5
Revision 5 is identical to revision 4 with improved test coverage.
6.6
Revision 4
Revision 4 is the initially released revision.
© 2020 Microchip Technology Inc.
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DS50002684B-page 25
ATtiny817 Xplained Pro
Document Revision History
7.
Document Revision History
Doc. Rev.
Date
Comments
B
02/2020
HW revision 7 and 8 added. Updated crystal information.
A
10/2017
Converted to Microchip format and replaced the Atmel document number 42745A.
Added links to QTouch example application in 4.3.4 QTouch® Button.
42745A
11/2016
Initial document release.
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ATtiny817 Xplained Pro
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ISBN: 978-1-5224-5465-6
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