Atmel 7698AAUTO01/07 Manuale utente

ATAVRAUTO200

..............................................................................................

User Guide

ATAVRAUTO200 User Guide i

7698A–AUTO–01/07

Table of Contents

Section 1

Introduction ........................................................................................... 1-1

1.1 Overview ...................................................................................................1-1

Section 2

Using the ATAVRAUTO200.................................................................. 2-3

2.1 Overview ...................................................................................................2-3

2.2 Power Supply ............................................................................................2-4

2.3 Oscillator Sources .....................................................................................2-4

2.4 On-board Resources.................................................................................2-4

2.5 In-System Programming ...........................................................................2-8

2.6 Debugging...............................................................................................2-11

Section 3

Technical Specifications ..................................................................... 3-13

Section 4

Technical Support............................................................................... 4-14

Section 5

Complete Schematics......................................................................... 5-17

ATAVRAUTO200 User Guide 1-1

7698A–AUTO–01/07

Section 1

Introduction

Congratulations on your purchase of the ATAVRAUTO200 board. This board includes

all elements necessary for designers to quickly develop code related to LIN communica-

tion node implementing the ATmega88 and for prototyping and testing of new designs.

1.1 Overview

This document describes the ATAVRAUTO200 dedicated to the ATmega88 AVR micro

controllers. This board is designed to allow an easy evaluation of the product using

demonstration firmware.

To increase its demonstrative capabilities, this stand alone board has numerous on-

board resources (motor relay, motor FET, hall sensor inputs, current measurements,

power supply measurement, LIN, push buttons).

Figure 1-1. ATAVRAUTO200

Introduction

1-2 ATAVRAUTO200 User Guide

7698A–AUTO–01/07

1.2 ATAVRAUTO200

features

The ATAVRAUTO200 provides the following features:

ATmega88 QFN32

AVR Studio

software interface

(1)

Power supply

– Regulated 5V

– From LIN connector (LIN network power supply)

JTAG connector:

– for on-chip In Situ Programming (ISP)

– for on-chip debugging using JTAG ICE

DC Motor connector

– DC Motor power supply output

– Hall effect sensor(s) power supply and input(s)

Serial interface:

– 1 LIN interface 1.3 and 2.0 compliant (firmware library available on the ATMEL

website for LIN 1.3).

On-board resources:

– 1 LIN transceiver with internal regulator

– Relay for DC motor control

– Shunt Resistor for motor current measurement

– Speed/Position measurement Inputs

– Power supply measurement

System clock:

– Internal RC oscillator

Dimension: 45 mm x 45 mm

Note: The ATmega88 is supported by AVR Studio, version 4.12 or higher. For up-to-

date information on this and other AVR tool products, please consult our web

site. The newest version of AVR Studio, AVR tools and this user guide can be

found in the AVR section of the Atmel web site, http://www.atmel.com.

ATAVRAUTO200 User Guide 2-3

7698A–AUTO–01/07

Section 2

Using the ATAVRAUTO200

2.1 Overview

Figure 2-1. Board Overview

Figure 2-2. Block Diagram

MOT

-06

E&ISP

LIN

Connector

Motor Relay

Hall

Motor

Current

ATmega88

ISP

LIN

Measurement

Connector

Sensor

Transceiver

Regulator

Connector

ATmega88

JTAG

Power supply

Measurement

Lin Transceiver

Power supply

12 Vdc

from LIN

LIN

Network

DC Motor

Relay

Motor Shunt

Position sensor

Motor

Output

Motor ring

Hall sensor

ISP

ISP & Debugger

(AVR Studio)

ISP

(AVR Studio)

Using the ATAVRAUTO200

2-4 ATAVRAUTO200 User Guide

7698A–AUTO–01/07

2.2 Power Supply

The on-board power supply circuitry is supplied through the LIN connector.

2.2.1 LIN powered The LIN connector power line is used to provide VBAT to the ATAVRAUTO200 LIN

transceiver.

A LIN network has to be connected to have your LIN interface function (Input supply

from 8 up to 18V DC, see Figure 2-3 on page 5) .

2.3 Oscillator Sources

The ATAVRAUTO200 board allows only one oscillator source:

Internal RC oscillator (Default configuration).

Note: The “Divide by 8” Fuse is configured by default. The first step in the demonstra-

tion application is to clear the prescaler to have the internal RC oscillator run-

ning at 8MHz:

CLKPR = (1<<CLKPCE); //! Clear Prescaler

CLKPR = 0;

2.3.1 Interal RC oscillatorn

A LIN Slave node with a run-time oscillator calibration can be used with the internal RC

oscillator.

At ambiant temperature and normal Vcc, the internal oscillator is precise enough to be

compliant with LIN 1.3 and 2.0 specifications. For wider temperature and/or power

ranges, a run-time calibration of the internal RC oscillator can be used as explained in

the application note AVR140: “ATMega48/88/168 family run-time calibration of the inter-

nal RC oscillator” available on the Atmel website.

2.4 On-board Resources

2.4.1 LIN & Power supply

The LIN screwed connector allows the user to select his own connector.

Note: The LIN power supply input is reverse voltage protected.

LIN transceiver control is realized by the micrcontroller. All modes depend on microcon-

troller’s ports configuration.

Using the ATAVRAUTO200

ATAVRAUTO200 User Guide 2-5

7698A–AUTO–01/07

Table 2-1. LIN ressources

Figure 2-3. LIN transceiver and power supply

Note: The LIN transceiver undervoltage protection can be disabled by removing the

NISP jumper.

Note: The NISP jumper has to be removed when programming.

2.4.2 Power supply measurement

The voltage measurement is realized with a bridge of resistors. The read value is 0.281

of the LIN power supply (47 KΩ / (47 KΩ + 120 KΩ)). Input voltage on channel 1 of the

ADC is limited to 5.1V by a zener diode. This will give a voltage reading range from 0 to

18.1V with Vcc as reference.

The power supply measurement can be performed using the A/D converter. See the

ATmega48/88/168 datasheet for how to use the ADC. The input voltage value (V

) is

calculated with the following expression:



Where: V

= Input voltage value (V)



ADC7

= Voltage value on ADC-1 input (V)

Function Port State Description

LIN_NSLP PD2 Low LIN transceiver in Sleep mode

High LIN transceiver in normal mode

NRES_LIN PC6 Low Perform MCU reset when NISP Jumper is inserted

High No Action

+VBat

GND

LIN

VIN 3.55 VADC1

×=

Using the ATAVRAUTO200

2-6 ATAVRAUTO200 User Guide

7698A–AUTO–01/07

Figure 2-4. Power supply measurement through ADC1

2.4.3 Motor relay

DC Motor can be operated through a relay. It is supplied with Vbat, -Vbat or 0V.

The relay allows the motor to be operated in two rotating directions, or to be stopped.

Table 2-2. Motor Relay commands

Figure 2-5. Motor on board command schematics

Function Port State Description

Mot_A PB1 Low/ Relay coil1 OFF (Normaly closed switch activated)

High Relay coil1 ON (Normaly opened switch activated)

Mot_B PB2 Low Relay coil2 OFF (Normaly closed switch activated)

High Relay coil2 ON (Normaly opened switch activated)

Table 2-3. Logical command table

Mot_A Mot_B Motor Supply Description

L L 0V Motor stopped

L H -Vbat Motor running (Direction B)

H L +Vbat Motor running (DirectionA)

H H 0V Motor stopped

Using the ATAVRAUTO200

ATAVRAUTO200 User Guide 2-7

7698A–AUTO–01/07

2.4.4 Current measurement

Motor current is measured using a shunt resistor. External differential amplifier (on

board) is connected to ADC to measure shunt resistor voltage.

Amplifer output (current image voltage) is connected to

ADC0 pin for current acquisition

AIN1 pin to detect max current peak (compared to AIN0 through internal analog

comparator)

The current measurement (I) can be performed using the A/D converter. See the

ATmega48/88/168 datasheet for how to use the ADC. The input voltage value (V

ADC-0

)

is calculated with the following expression:

Analog comparator allows peak current detection. It provides interrupts on analog com-

parator output change. See the ATmega48/88/168 datasheet for how to use the Analog

comparator. Comparison voltage is determined for a 12A peak which leads to:

V

AIN0

= 1.5V

Figure 2-6. Current Acquisition chain and current Peak detection

2.4.5 Speed/Position measurement inputs

A screw connector with 4 inputs can be used to plug two hall effect sensors. The two hall

effect sensors inputs are connected to the two external interrupt pins (INT0 and INT1) of

the microcontroller.

Figure 2-7. Hall sensor effect interface

VADC-0 Gain Vshunt Gain Rshunt I××=×30,16 0.005 I××= =( )

VADC-0 0.151 I×=







+Vcc

Hall1

Hall2

GND

Using the ATAVRAUTO200

2-8 ATAVRAUTO200 User Guide

7698A–AUTO–01/07

2.4.6 LED

The ATAVRAUTO200 includes one green LED implemented on one I/O pin. It is con-

nected to the “PortD Pin3” of the ATmega48/88/168. To light On the LED, the

corresponding port pin must drive a low level. To light Off the LED, the corresponding

port pin must drive a high level.

Figure 2-8. LED schematic

2.4.7 BOOT

An additional jumper (BOOT) has been added. This jumper is available for custom use.

For example : the BOOT jumper can be used to switch from the application to the boot-

loader by firmware (Not implemented in the example) by reading the pin7 of PortB.

Figure 2-9. BOOT Jumper

2.5 In-System Programming

The ATmega88 can be programmed using specific SPI serial links. This sub section

will explain how to connect the programmer.

The Flash, EEPROM memory (and all Fuse and Lock Bit options ISP-programmable)

can be programmed individually or with the sequential automatic programming option.

Note: If debugWire fuse is enabled, AVR ISP can’t be used. If debugWire fuse is dis-

abled, JTAGICE mkII have to be used in ISP mode to enable debugWire fuse.

Note: When programming, the NISP jumper has to be removed.

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