Hardware User Guide of DALI 2.0 Slave on...

Hardware User Guide of DALI2.0 Slave on ATtiny817

Hardware User Guide of DALI 2.0 Slave on ATtiny817

Introduction

This document will guide the user with how to start with the DALI 2.0 Slave board design based on theATtiny817 microcontroller.

For this engagement board, the hardware design files (schematic, BOM, and PCB Gerber) and softwaresource code can be downloaded from the Microchip website. The provided hardware documentation canbe used with no limitations to manufacture the reference hardware solution for the design.

The source code and firmware user guide can be downloaded from http://www.microchip.com/.

Features

• Highly reliable design within -40°C to +105°C• DALI 2.0 Slave function• Programming and debugging of the ATtiny817 through UPDI interface

© 2017 Microchip Technology Inc. User Guide DS50002631A-page 1

http://www.microchip.com/

Table of Contents

Introduction......................................................................................................................1

Features.......................................................................................................................... 1

1. Overview....................................................................................................................31.1. System Overview......................................................................................................................... 31.2. DALI Interface.............................................................................................................................. 31.3. MCU Connection..........................................................................................................................5

2. User Interfaces.......................................................................................................... 62.1. USB Power Supply.......................................................................................................................62.2. DALI Bus Connector.....................................................................................................................72.3. UPDI Header................................................................................................................................72.4. Status LEDs................................................................................................................................. 92.5. Lighting LED...............................................................................................................................102.6. ISP/SPI Header.......................................................................................................................... 112.7. Button.........................................................................................................................................12

3. Firmware..................................................................................................................143.1. Firmware Programming..............................................................................................................14

4. System Setup.......................................................................................................... 164.1. DALI Master............................................................................................................................... 164.2. System Control...........................................................................................................................16

5. Revision History.......................................................................................................17

The Microchip Web Site................................................................................................ 18

Customer Change Notification Service..........................................................................18

Customer Support......................................................................................................... 18

Microchip Devices Code Protection Feature................................................................. 18

Legal Notice...................................................................................................................19

Trademarks................................................................................................................... 19

Quality Management System Certified by DNV.............................................................20

Worldwide Sales and Service........................................................................................21



1. OverviewThe DALI 2.0 Slave on the ATtiny817 board is intended to demonstrate the ATtiny817 tinyAVR® 8-bitmicrocontroller.

1.1 System OverviewFigure 1-1. Overview of the DALI 2.0 Slave on the ATtiny817 Board

Figure 1-2. System Block Diagram

1.2 DALI InterfaceDALI Interface circuit handles the communication between the MCU and the DALI bus.

Following the DALI protocol, the DALI bus carries a differential signal, the DALI interface circuit transferthe communication between the MCU and DALI bus.



The DALI bus is differential pair, to avoid the risk of sharing common ground, the DALI interface circuit isisolated with the MCU part via two optocouplers. The repetitive peak isolation voltage of these twooptocouplers reached 890V as described in datasheet.

For decoding, the DALI interface uses constant current source to provide a stable power supply for thecomparator MIC834. As its internal stable reference, the output of comparator depends on the regularinput. The output signal drives the optocoupler to transfer the signal to the MCU. For coding, the MCUdrives the optocoupler directly to get the DALI bus modulated via a MOSFET.

All components on the board are designed with a high reliable consideration, which makes the systemworking stable within the temperature range from -40°C to +105°C.

Figure 1-3. DALI Interface

Figure 1-4. Schematic of the DALI Interface



1.3 MCU ConnectionThe ATtiny817 is a microcontroller using the tinyAVR 8-bit microprocessor, with 8 KB Flash, 512 bytes ofSRAM, and 128 bytes of EEPROM.

Figure 1-5. MCU

Figure 1-6. Schematic of the MCU



2. User InterfacesThe on-board interfaces for the user include USB power supply socket, DALI bus connector, and UPDIheader. The Status LEDs and the Lighting LED can be used for indicating.

There are some parts reserved and not mounted, including the ISP/SPI header and the Button.

2.1 USB Power SupplyThe USB only acts as a 5 VDC power supply for the board, no data communication on the cable. The 5VDC supply the MCU and the system directly.

Table 2-1. Pin Definition of the USB Socket

Pin Name Connection

1 Vbus 5V power supply

2 D- NC

3 D+ NC

4 ID NC

5 GND GND

The USB power supply requires the standard power with voltage tolerance from 4.85V to 5.25V. Thepower consumption of the board is quite low for the USB port. Any USB port with 100 mA or higher outputcapability can power the board.

The USB socket supports the micro-USB cable only. The connection is shown in the figure below.

Figure 2-1. USB Power Supply to the Board



Figure 2-2. Schematic of the USB Socket

2.2 DALI Bus ConnectorThe DALI Bus connector is dedicated for the DALI bus.

The DALI bus is a pair of cables, which can connect the DALI Master and all DALI Slaves. Since the DALIbus carries the differential signal, the users need not to take care of the polarity of the connection.

Strip the DALI bus cable in both ends first. Push the socket header on the top, then insert the cable to thehole, and release the header. The cable will be locked in the socket.

The accomplished figure should look like the figure below.

Figure 2-3. The DALI Bus Connector

2.3 UPDI HeaderThe UPDI header is dedicated for the user to reprogram the ATtiny817. It is a 1.27 mm pitch 10-pinheader, which can be directly connected to the Atmel-ICE.

Note: For Atmel-ICE, use the AVR® port to connect it.



Table 2-2. Pin Definition of the UPDI Header

Pin Name

1 NC

2 GND

3 UPDI_RESET

4 VCC

5 RESET

6 NC

7 NC

8 NC

9 NC

10 NC

Figure 2-4. UPDI Header



Figure 2-5. UPDI with Atmel-ICE

Figure 2-6. Schematic of the UPDI Header

2.4 Status LEDsThere are two LEDs mounted on the board, one green and the other red, combined in one singlecomponent. Both can be used as the status indication.

The green LED is defined as the power supply in the default firmware. The users can use it freely in theirown applications.

Table 2-3. Pin Definition of Status LEDs

Name Color Port on ATtiny817

LED1 Green PA3

LED2 Red PA2



Figure 2-7. Status LEDs

Figure 2-8. Schematic of the Status LEDs

2.5 Lighting LEDThe Lighting LED is an output of the DALI Slave. It is driven by a PWM signal generated by theATtiny817. The brightness of the Lighting LED can be changed upon the duty of the PWM signal. Thedrive pin of ATtiny817 is PA5.

The DALI system is widely used in the lighting system. The Lighting LED can be regarded as a lightingtarget device. While working together with the DALI Master, the user can easily get a control feedbackfrom the brightness change of the Lighting LED.



Figure 2-9. Lighting LED

Figure 2-10. Schematic of the Lighting LED

2.6 ISP/SPI HeaderThe ISP/SPI Header is not mounted by default on the board. It is open for the user to mount manually. Astandard 6-pin 2.54 mm pitch header is needed for mounting. The header can be used as a standardISP/SPI extension for other modules/boards. The pin definition is shown in the table below.

Table 2-4. Pin Definition of the ISP/SPI Header

Pin Port on ATtiny817 Name

1 PC1 SPI_MISO

2 VCC VCC

3 PC0 SPI_SCK

4 PC2 SPI_MOSI

5 PC5 RST_BUTT

6 GND GND



Figure 2-11. The ISP/SPI Header

Figure 2-12. Schematic of the ISP/SPI Header

2.7 ButtonA button is designed for the board, but is not functional and not mounted by default on this board. It isopen for the user to use it freely.

The button connects on the PC5 pin of ATtiny817.

Figure 2-13. The Button



Figure 2-14. Schematic of the Button

Note: Resistor R106 (39Ω, 0402, ±1%) should be mounted in series with button SW101 if the user mustuse SW101.



3. FirmwareA default firmware is pre-programmed in the ATtiny817 microcontroller. It fully follows the standard DALI2.0 protocol. The firmware can also be updated or re-programmed via the UPDI interface.

3.1 Firmware ProgrammingThe hex of default code is available in the attached package for re-programming. Both Flash and Fuseneeds be programmed, as the setting shown in figure below.

Figure 3-1. Program Default Code



Figure 3-2. Program Fuse



4. System SetupTo build the DALI system, a DALI Master and a DALI Bus Power Supply are needed. The system shouldbe set up as the figure below.

Figure 4-1. DALI System Setup

Note: The DALI Master Kit illustrated above can be treated as an example, assume it already containsthe DALI bus power supply, while the 16 VDC adapter is the power supplier of the DALI bus.

4.1 DALI MasterTo build a full DALI system, a DALI Master and DALI bus power supply are needed.

Any DALI Master which follows the DALI 2.0 protocol can handle the work.

4.2 System ControlUnder the control of the DALI Master, the DALI Slave should have seen changes via the onboard LightingLED according to the control commands from DALI Master. For example, if the broadcast command'Maximum level' is sent, the Lighting LED should be turned ON and display the maximum brightness.While the command 'OFF' is sent, the DALI Slave's Lighting LED should be turned OFF immediately.



5. Revision HistoryDoc Rev. Date Comments

A 08/2017 Initial document release.



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IntroductionFeaturesTable of Contents1. Overview1.1. System Overview1.2. DALI Interface1.3. MCU Connection

2. User Interfaces2.1. USB Power Supply2.2. DALI Bus Connector2.3. UPDI Header2.4. Status LEDs2.5. Lighting LED2.6. ISP/SPI Header2.7. Button

3. Firmware3.1. Firmware Programming

4. System Setup4.1. DALI Master4.2. System Control

5. Revision HistoryThe Microchip Web SiteCustomer Change Notification ServiceCustomer SupportMicrochip Devices Code Protection FeatureLegal NoticeTrademarksQuality Management System Certified by DNVWorldwide Sales and Service

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