Atmel ATtiny1634-EK1 Manuale utente

9341B-AVR-02/15

Features

●Atmel®ATtiny1634 MCU

●Atmel ATA663254 SBC – LIN transceiver with integrated voltage regulator

●Touch

●Three Atmel QTouch®buttons

●One Atmel QTouch slider

●Analog I/O

●One potentiometer connected to the ADC of the Atmel ATtiny1634 MCU

●Digital I/O

●Six user LEDs

●Various headers for direct access

●Two possible power sources for the Atmel ATtiny1634 MCU

●Voltage regulator of the Atmel ATA663254 SBC

●External 5V header

●Connectivity

●LIN Bus

Kit Contents

●Boards:

●1x ATABtiny1634A-V1 – ATtiny1634 MCU with ATA663254 LIN SBC demonstrator

(slave board) with touch sensors

●1x ATmega64M1 Xplained – LIN to USB gateway

●Other accessories.

●1x 12V power supply

APPLICATION NOTE

ATtiny1634-EK1 User Guide

ATAN0080

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1. Introduction

1.1 Kit Overview

The Atmel®ATAtiny1634-EK1 automotive evaluation kit provides a hardware platform for evaluating the Atmel ATtiny1634

automotive MCU and Atmel ATA663254 SBC and for developing software for the Atmel ATtiny1634 MCU. The Atmel

ATtiny1634 is a high-performance, low-power AVR®microcontroller with 16KB of in-system self-programmable Flash

memory and 1KB of internal SRAM designed specifically for automotive applications. The ATABtiny1634A board included in

the kit interfaces the ATtiny1634 MCU to different types of I/O signals. The board also provides interfaces to several

capacitive touch buttons and one capacitive touch slider as well as six LEDs and a potentiometer. The Atmel ATA6632 SBC

integrating the LIN transceiver along with a voltage regulator and a watchdog enables the LIN bus functionality. In addition to

the variety of I/Os provided directly on the board, all MCU I/O signals are made available on the header pins to support easy

connection to external I/Os. When combined with available embedded software, the ATABtiny1634A board is an ideal

platform for initial development of customer-specific applications.

To facilitate the connection to a LIN bus, the kit includes an ATmega64-M1 Xplained board programmed to act as a

USB-to-LIN gateway. Using this gateway, the ATABtiny1634A board can be connected to an available PC GUI application to

monitor and control the on-board I/Os. More generally, the PC GUI application could be used along with the gateway board

to simulate LIN master traffic to aid in the development of an ATABtiny1634A board LIN slave application.

This kit is supported by standard Atmel AVR development tools available at

http://www.atmel.com/design-support/software-tools/default.aspx.

The kit offers a set of features that enables the user to get started right away and gain an understanding of how to integrate

the ATtiny1634-EK and the Atmel ATA663254 within their own design.

Figure 1-1. ATABtiny1634A_V1 PCB

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2. Getting Started

2.1 Quick Start

There are several ways to supply power to the kit.

2.1.1 Kit Power Supply via a VBat Supply Voltage

This is the easiest way to supply the kit with power. When using this method, please note that power for the entire board is

supplied by the Atmel®ATA663254 LIN SBC and is therefore limited to a maximum of 85mA. The following steps ensure

correct functionality:

1. Mount the J2, J3, and J11 jumpers.

2. Connect the 12VDC power supply plug to the X2 power input socket on the ATABtiny1634A-V1 PCB to supply the

board with power.

2.1.2 Supplying Power to the MCU and the LIN SBC Independently

This power supply variant allows more current to be driven than is available from the LIN SBC by supplying the current from

an externally regulated 5VDC power supply.

1. Mount the jumper J11 (if the transceiver is to be used).

2. Remove the J2 and J3 jumpers. Connect +5VDC to J2 - VCC_MCU and to J3 - VCC_IO as indicated in Figure 2-

1. The pins on J5/VCC_IO and J5/VCC_CPU can alternatively be used.

Figure 2-1. Independent MCU and LIN SBC Power Supply

3. Connect +7 to +28VDC to X2 (if the transceiver is to be used). The power LED D8 only lights up if J11 is mounted

and sufficient voltage is supplied to X2.

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2.1.3 Connecting the USB-to-LIN Bridge

The ATmega64M1 Xplained board is used to bridge all LIN messages to USB and vice versa. It can be used with the

supplied GUI as well to monitor the status of the touch buttons, potentiometer and to control the LEDs.

The LIN, LIN_VS (supply voltage), and GND lines between the ATmega64M1 Xplained and the ATABtiny1634-V1 have to

be connected using the J5 header on the ATABtiny1634 and the corresponding header on the ATmega64 Xplained. Care

has to be taken when setting up the connection. When making the connections as shown in Figure 2-2, the outer red and

black cables cross the middle cable. The pin descriptions on the silkscreen should be read carefully.

Figure 2-2. LIN Connection

2.1.4 Configuring the ATmega64M1 Xplained

The following points need to be considered when using the ATmega64M1 Xplained as a USB-to-LIN bridge. For a more

detailed description of the board, please refer to the ATmega64M1 Xplained hardware user guide.

1. 5VDC power supply is provided to the ATmega64M1 by connecting the VCC_MCU (marked in green) (e.g.,

J300/pin) to any of the USB 5V output sources (marked in red, e.g., VCC_5V_USB (onboard) on J406/pin 1 or

J3/pin10). Please see example in Figure 2-3.

Note: If there is an existing jumper on the J201 header (VCC_MCU and VCC_P3_V3 pins), it must be removed.

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Figure 2-3. Voltage Domain VCC_MCU

2. VS_LIN, LIN, and GND must be connected to the corresponding signals on the ATABtiny1634-V1.

2.2 Design Documentation and Related Links

The following list contains links to the most relevant documents and software for the ATtiny1634-EK1.

1. ATtiny1634-EK1 Design Documentation – package containing schematics, BOM, assembly drawings, 3D plots,

layer plots, software, etc.

2. Atmel®Studio (http://www.atmel.com/atmelstudio) – free Atmel IDE for development of C/C++ and assembler

code for Atmel microcontrollers.

3. IAR Embedded Workbench®(http://www.iar.com/en/Products//IAR-Embedded-Workbench/AVR/) is a commercial

C/C++ compiler that is available for AVR®devices. There is a 30-day evaluation version as well as code size lim-

ited kick-start version available from the IAR website.

4. Device samples can be ordered from Atmel sample store (http://www.atmel.com/system/samplestore).

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3. Headers, Connectors, and Jumpers

The ATABtiny1634A-V1 has several headers, connectors, and jumpers to configure and connect the board to different

applications.

3.1 Detailed Description of the Headers

Table 3-1. Headers Overview

Header

Designator Description

J1 J1 (1x2) multiplexes PC5 and PC4 ports of the Atmel ATtiny1634 MCU between LEDs and XTAL pins.

J2 J2 (1x2) connects the Atmel ATtiny1634 VCC_CPU power pin to the VCC_VREG voltage regulator

output. Please note that the VREG output of the Atmel ATA663254 is limited to 85mA.

J3 (1x2) connects the VCC_IO power pin to the VCC_VREG voltage regulator output. Please note

that the VREG output of the Atmel ATA663254 is limited to 85mA. VCC_IO is the supply voltage for

the LEDs, the potentiometer and is available on several headers.

J4 J4 (1x2) can be used to enable the pull-up resistor needed for a LIN master node. The jumper on this

header should be removed when operating the board as a LIN slave node.

J5 J5 (1x8) connects ATABtiny1634A-V1 PCB to external power supply (VCC, LIN_VS), GND, LIN IO

pin, VCC_VREG, and external power supplies (VCC_MCU, VCC_IO).

J6 J6 (2x6) connects the Atmel ATtiny1634 IO ports to the D0-D5 LEDs.

J7 J7 (2x3) is used as the ISP header.

J8 J8 (2x3) provides access to the Atmel ATtiny1634 ports (PB1, PB2, PC3), AREF, VCC_IO, and GND

pins.

J9 J9 (2x6) connects the Atmel ATtiny1634 to the QTouch on-board sensors, i.e., three buttons or a

slider. Place 1x2 jumpers across to connect the on-board buttons or a slider.

J10 J10 (1x2) connects the NRES of the Atmel ATA663254 LIN SBC to the NRES of the ATtiny1634 MCU.

J11 J11 (1x2) connects the external power supply on X2 to LIN_VS.

J12 J12 (1x2) is the autobaud enable header. It can be used to connect RXD1 to IC1 (Timer1/Counter1) to

measure sync bytes on RXD1.

J13 J13 (1x3) provides QTouch debug mode digital outputs.

J14 J14 (1x2) is a potentiometer enable header. Connects the potentiometer output to PB0 using a

jumper.

J15 J15 (2x6) multiplexes between QTouch sensors. Selects either three buttons (CS2, CS3, CS4) or one

slider (CS1).

Table 3-2. J1 Header (XTAL/LED)

Pin Description

1LED3

2LED2

3PC5

4PC6

5External crystal pin 1

6External crystal pin 3

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Table 3-3. J5 Header (IO)

Pin Description

1GND

2LIN

3LIN_VS

4GND

5VCC_CPU

6VCC_IO

7VCC_VREG

8GND

Table 3-4. J6 Header (LEDs)

Pin Description

1PORTC2

2LED0 cathode

3PORTA1

4LED1 cathode

5PORTC4

6LED2 cathode

7PORTC5

8LED3 cathode

9PORTC0

10 LED4 cathode

11 PORTC1

12 LED5 cathode

Table 3-5. J7 Header (ISP)

Pin Description

1MISO

2VCC_IO

3SCK

4MOSI

5NRES

6MOSI

Table 3-6. J8 Header

Pin Description

1PB1

2PB2

3PC3

4AREF

5GND

6VCC_IO

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Table 3-7. J9 Header

Pin Description

1J15 pin 2

2R5 (touch channel 2 K), C6 (touch channel 2S)

3NC

4NC

5J15 Pin 6

6R4 (touch channel 1 K), C7 (touch channel 1 S)

7NC

8NC

9J15 pin 10

10 R3 (touch channel 0 K), C8 (touch channel 0 S)

11 NC

12 NC

Table 3-8. J13 Header (QTouch Debug)

Pin Description

1GND

2MOSI

3SCK

Table 3-9. J15 Header (QTouch Sensor)

Pin Description

1QTouch slider channel 2 – end electrodes

2J9 pin 1

3NC

4QTouch button CS4

5QTouch slider channel 1

6J9 pin 5

7NC

8QTouch button CS3

9QTouch slider channel 0

10 J9 pin 9

11 NC

12 QTouch button CS2

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4. Peripherals

4.1 QTouch Sensors

The QTouch algorithms enable either the three QTouch buttons or the QTouch slider to be used.

Obviously, the software used should match the connected sensors. The software shipped with the kit uses the slider in

stand-alone mode. To evaluate the use of the buttons in stand-alone mode, the source initializing the touch functionality

located in the main.c file must be changed.

/* Init Touch */

AtaDevTouch_init(QT_SENSOR_SLIDER);

qt_sensor_flag = QT_SENSOR_STATE_SLIDER;

/* Init Touch */

AtaDevTouch_init(QT_SENSOR_BUTTONS);

qt_sensor_flag = QT_SENSOR_STATE_BUTTONS;

Alternatively, the GUI-connected mode can be used to evaluate the buttons as described in Section 5.2 “GUI-Connected

Mode” on page 10. The jumpers on header J15 must be connected as shown below to use the CS2 to CS4 QTouch buttons.

The jumpers on header J15 must be connected as shown below to use the CS1 QTouch slider.

In either method, the following pins on the J9 header must be connected: 1-2, 5-6, 9-10.

4.2 LEDs

Six LEDs can be used to display the status of the application. The relevant headers are J6 and J1. To use the LEDs, the pins

on the J6 header must be connected 1-2, 3-4, etc. To use the LED2 and LED3, it is also necessary to connect the jumpers

on pins 2-4 and 1-3 on the J1 header so that the Atmel®ATtiny1634 MCU port can be connected directly to the LEDs. The J1

header must be configured correctly to enable PC4-LED2 and PC5-LED3 connections; alternatively, the J1 header can be

used to supply an external oscillator or a clock to the microcontroller.

LED5 can only be used if the J12 autobaud jumper is not mounted and the autobaud feature is disabled. This requires

recompiling the software or using the GUI to deactivate autobaud.

4.3 Potentiometer

A potentiometer can be connected to an Atmel ATtiny1634 MCU port pin to evaluate the ADC. The potentiometer is

connected to VCC_IO and GND, resulting in the full ADC range being used when AREF=VCC_IO is used. Jumper J14 has

to be mounted to use the potentiometer.

Table 4-1. J15 Header in Button Configuration

J15 Header Pins

Pin 2 – Pin 4

Pin 6 – Pin 8

Pin 10 – Pin 12

Table 4-2. J15 Header in Slider Configuration

J15 Header Pins

Pin 1 – Pin 2

Pin 5 – Pin 6

Pin 9 – Pin 10

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5. Example Software User Guide

The example software delivered with this board demonstrates some of the basic functions of the Atmel®ATTiny1634 and the

Atmel ATA663254. Depending on whether the supplied GUI is to be used, the software implements two different working

modes.

5.1 ATABtiny1634A-V1 in Stand-Alone Mode

The ATABtiny1634A-V1 and the power supply included in the kit are required for running in this mode. The kit must be

connected as outlined in Section 2.1.1 “Kit Power Supply via a VBat Supply Voltage” on page 3.

The jumpers need to be set to the following positions for the stand-alone mode to work as expected:

●Header J6 - jumpers for LEDs 0-4 mounted 1-2, 3-4,5-6,7-8

●Jumper J14 mounted

●Header J1 mounted 1-3, 2-4

●Jumper J2 mounted

●Jumper J15 mounted 1-2,5-6,9-10

●Jumper J9 mounted 1-2,5-6,9-10

●Jumper J11 mounted

●Jumper J12 not mounted

With this jumper setting the Atmel ATTiny1634 MCU uses the ADC to continuously measure the QTouch slider and the

potentiometer.

The LEDs D0-D1 display the status of the potentiometer and light up in roughly linear fashion compared to the potentiometer

position.

The D2-D4 LEDs display the status of the Atmel QTouch slider. If the QTouch buttons are to be displayed, the source code

has to be recompiled to use the buttons in stand-alone mode as described in Section 4.1.1 and jumper J15 must be

configured to interface with the QTouch buttons as described in Section 4.1 “QTouch Sensors” on page 9.

5.2 GUI-Connected Mode

A GUI running on a PC host is used to communicate with the gateway via the USB port for sending LIN commands to the LIN

slave node.

System functionality can be summarized as follows:

●ATmega64M1 Xplained PCB is used as the LIN bus gateway and LIN bus master. It uses the USB port to

communicate with the host PC. It also uses the LIN bus and acts as a master for sending LIN messages to the LIN

slave.

●The ATtiny1634A-V1 PCB is used as a LIN bus slave device with QTouch peripherals. The Atmel ATA663254 LIN

SBC transceiver interfaces to the LIN bus. The slave node can detect touch inputs and transmit the touch data on the

LIN bus to the LIN master gateway which then relays it to the host PC for display in the GUI window. By using the GUI

on the host, PC commands can also be sent to the LIN slave PCB, e.g., to switch on the LED. The input from the LIN

slave node can also be displayed in the GUI window, such as for displaying the push button or state of the

potentiometer in real time.

5.2.1 Evaluating the System with the GUI

To evaluate operation of the ATABtiny1634A board using the GUI, both the ATABtiny1634A board and the ATmega64M1

Xplained board must be properly configured as described in Section 5.2.2 “Step-By-Step Instructions for Connecting and

Operating the Kit” on page 11. Once both boards are properly configured and interconnected and the ATmega64M1

Xplained board is connected by USB to a PC, then the GUI on the PC can be used to interact with the ATABtiny1634A

board. The software on the ATABtiny1634A board automatically switches from stand-alone operation to GUI-connected

operation when it detects a valid LIN frame.

Section 6. “GUI User Guide” on page 15 provides more detailed information on how to use the GUI. This mode works in a

manner very similar to stand-alone mode except that the potentiometer reading and the QTouch sensor status is reported to

the GUI via LIN instead of controlling the LEDs, allowing the LEDs to be controlled as outputs from the GUI.

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