Atmel 7698AAUTO01-07, ATAVRAUTO200 User Manual

ATAVRAUTO200

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

User Guide

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 i

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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 communica­tion 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 on­board resources (motor relay, motor FET, hall sensor inputs, current measurements,
power supply measurement, LIN, push buttons).

Figure 1-1. ATAVRAUTO200

ATAVRAUTO200 User Guide 1-1

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Introduction

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.

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2.1 Overview

AT

AV

LIN

Connector

Motor Relay

Hall

Motor

Current

ATmega88

ISP

LIN

Measurement

Connector

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)

Section 2

Using the ATAVRAUTO200

Figure 2-1. Board Overview

Figure 2-2. Block Diagram

ATAVRAUTO200 User Guide 2-3

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Using the ATAVRAUTO200

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 run­ning 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 inter­nal 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 microcon­troller’s ports configuration.

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Using the ATAVRAUTO200

+VBat

G

N

D

L

I

N

V

IN

3.55 V

AD C

1

×=

Table 2-1. LIN ressources

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

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 (VIN) is
calculated with the following expression:



Where: V



V

ADC7

IN

= Input voltage value (V)

= Voltage value on ADC-1 input (V)

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Using the ATAVRAUTO200

2.4.3 Motor relay

Figure 2-4. Power supply measurement through ADC1

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

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

Figure 2-5. Motor on board command schematics

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2.4.4 Current measurement

V

ADC-0

Ga i n V

shunt

Ga i n R shunt I××=× 30,16 0.005 I××= =( )

V

ADC-0

0.151 I×=







+Vcc

Hall1

Hall2

GND

Using the ATAVRAUTO200

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 com­parator 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

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Using the ATAVRAUTO200

2.4.6 LED

2.4.7 BOOT

The ATAVRAUTO200 includes one green LED implemented on one I/O pin. It is con­nected to the “ PortD Pin3” of the ATm ega48/88/168. To light O n 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

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 boot­loader 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-

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

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

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2.5.1 Using the ATAVRAUTO900 Adaptator

JTAGICE

ISP

The arrow has to be in front of the point

An additionnal adaptator has to be used to program the board using IPS or JTAG mode.
The 10 pins connector is used for the JTAGICE mkII device and the 6 pins connector is
used for the AVRISP device. To plug the ATAVRAUTO900 connector to the board, the
arrow (on the adaptator) has to be in front of the point (on the board).

Figure 2-10. ATAVRAUTO900 Connection

Table 2-4. ICE Connector

Using the ATAVRAUTO200

PIN Function

1 TCK

2 GND

3 TDO

4 VCC

5 TMS

6 NRES

7 VCC

8 NC

9 TDI

10 GND

Table 2-5. ISP Connector

PIN Function

1 MISO

2 VCC

3 SCK

4 MOSI

5 NRES

6 GND

ATAVRAUTO200 User Guide 2-9

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Using the ATAVRAUTO200

AVR ISP

JTAGICE mkII

2.5.2 Programming with AVR ISP Programmer

The AVR ISP programmer is a compact and easy-to-use In-System Programming tool
for developing applications with ATmega88. Due to its small size, it is also an excellent
tool for field upgrades of existing applications. It is powered by the ATAVRAUTO200
and an additional power supply is thus not required.

The AVR ISP programming interface is integrated in AVR Studio.

To program the device using AVR ISP programmer, connect the AVR ISP to the adapta­to r (A TA V RAUT O9 00 ) and co n ne ct th e ad a ptat or to the c on nec t or of the
ATAVRAUTO200.

Figure 2-11. Programming from AVR ISP programmer using ATAVRAUTO900.

Note: See AVR Studio® on-line Help for information.

2.5.3 Programming with AVR JTAGICEmkII

The ATmega48/88/168 can be programmed using specific JTAG link: 3-wire debug­WIRE inte rfac e . To u se the AVR J T A GICEmkII w i t h an ATAVRAUTO200 thr
ATAVRAUTO900 adaptator has to be be used. Then the JTAG probe can be connected
to the ATAVRAUTO200 as shown in the following Figure 2-12.

To use the JTAGICEmkII in ISP mode the 3 jumpers “SCK”, “MISO” and “MOSI” of the
adaptator (ATAVRAUTO900) should be connected.

Figure 2-12. JTAGICE mkII probe connecting through debugWIRE interface

Note: When the debugWIRE Enable (DWEN) Fuse is programmed and Lock bits are

Note: See AVR Studio® on-line Help for information.

unprogrammed, the debugWIRE system within the target device is activated.
R E SE T p in i s c on f i g ur ed as co mm un ic a ti on ga t ew ay be tw e en
ATmega48/88/168 and JTAG. JTAGICE mkII must have control over it.

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2.6 Debugging

2.6.1 Debugging with AVR JTAGICEmkII

The ATAVRAUTO200 can be used for debugging with JTAG ICE MK II.

Connect the JTAG ICE mkII as shown in Figure 2-12 for debugging, please refer to AVR
Studio Help information.

Using the ATAVRAUTO200

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Section 3

Technical Specifications

 System Unit

– Physical Dimensions...............................................L=45 x W=45 x H=8 mm

– Weight ........................................................................................................25 g

 Operating Conditions

– Internal Voltage Supply ..... ...................................................................... 5.0V

– External Voltage Supply .....................................................................7V -18V

ATAVRAUTO200 User Guide 3-13

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Section 4

Technical Support

For Technical support, please contact [e-mail]. When requesting technical sup­port, please include the following information:

 Which target AVR device is used (complete part number)

 Target voltage and speed

 Clock source and fuse setting of the AVR

 Programming method (ISP, JTAG or specific Boot-Loader)

 Hardware revisions of the AVR tools, found on the PCB

 Version number of AVR Studio. This can be found in the AVR Studio help menu.

 PC operating system and version/build

 PC processor type and speed

 A detailed description of the problem

ATAVRAUTO200 User Guide 4-15

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Section 5

Complete Schematics

On the next pages, the following documents of ATAVRAUTO200 are shown:

 Complete schematics,

 Bill of materials,

 Assembly drawing.

ATAVRAUTO200 User Guide 5-15

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Complete Schematics

Figure 5-1. ATAVRAUTO200 schematic

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Figure 5-2. ATAVRAUTO200 Bill of Materials

Complete Schematics

ATAVRAUTO200 User Guide 5-17

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Complete Schematics

LIN Motor by Mega88

C1

R10

C6

C4

R1

R12

Q1

BOOT

R16

R18

R5

R2

R20

U3

R3

C12

C11

R13

R23

R15C13

C5R6

DG

R4

R19 R22

Q2

D2

C8R8R7

HALL

R21

K1

C3

MOT

PM-06

V1.0

ATAVRAUTO200

C10

R17

NISP

R14

C7

C9

C2

ICE&ISP

U2

F1

NRES

R9 F2

U1

D1

LIN

Figure 5-3. ATAVRAUTO200 assembly drawing

5-18 ATAVRAUTO200 User Guide

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