Atmel AVR1014 User manual

AVR1014: MC303 Hardware User Guide

Features

• Motor Control device board for Atmel®ATxmega128A1

• Modular system with 2.54mm pin header connector for power board MC300

• Sensor & sensorless modes capabilities

• Hall sensor header, Potentiometer for motor control

• Headers for Atmel DB101 Display module

• USB interface for PC connection and usage of Atmel Motor Control Center software

• ISP & debug interface for both ATxmega128A1 & USB device.

• Electric specifications:

- Supplied with Power board MC300 from 3.3V up to 5V

• Dimension: 100x100mm

1 Introduction

The MC303 is the device board for ATxmega128A1 AVR® microcontroller which

can be connected to the general-purpose power stage board MC300 for driving

brushless DC, brushed DC and stepper motors. This board is also designed to be

connected on any other driver board which could share the same interface. Power

and all signals needed for a power stage board are available on the right side of

the board. Jumpers allow demonstrating sensor or sensorless modes of motor

control. Finally, interfaces like USB or Atmel DB101 Display module is also

available.

Figure 1-1. MC303 Motor control ATxmega128A1 processor board.

8-bit

Microcontrollers

Application Note

Rev. 8296A-AVR-03/10

2 AVR1014 8296A-AVR-03/10

2 Hardware overview

Please refer to schematics, layout and BOM available at http://www.atmel.com.

The MC303 motor control processor board is an ATxmega128A1 AVR microcontroller

solution connected to a power stage board intended for driving DC motors (Brushless

or brushed). All signals coming from the power stage board are connected to the

microcontroller either directly or through jumpers for sensorless or sensor

configuration. External comparators present on the board or internal comparators of

the ATxmega128A1 allow for sensorless control mode.

A potentiometer enables the user to control the motor: speed & direction in sensor

mode and speed only in sensorless mode.

A Usart to USB bridge is available to transfer motor control status & commands to a

PC software interface: Atmel Motor Control Center.

Three 2.54mm headers are available to add the Atmel DB101 Display module in

order to enhance visualization of motor control data & commands.

Three 8-pin & one 16-pin 2.54mm (100mil) horizontal male pin headers on the right

side of the board form a system connector for the power boards like MC300.

Both microcontrollers: ATxmega128A1 & AT90USB1287 have their own JTAG

interface for user’s specific developments.

Test points either mounted or not, are also available for instrumentation.

AVR1014

8296A-AVR-03/10

2.1 PCB Layout

The MC303 is organized as shown in Figure 2-1. Most signals, important components

and jumper information are written on the silk screen. Test points are also available

for user instrumentation. For individual component placement refer to the component

floor plan.

Figure 2-1. MC303 PCB layout.

In Figure 2-1 the following areas are marked:

1. Power board connector.

2. USB bridge

3. Atmel DB101 Display module headers

4. Potentiometer for manual command

4 AVR1014 8296A-AVR-03/10

2.2 Specifications

MC303 maximum ratings with components as delivered:

•Vcc = 3.3V, Imax = 0.5A

When working at Vcc 2.7V-3.3V, the user can keep USB functional by selecting

power supply for USB coming from VBUS rather than from Vcc.The selection is made

on the J11 jumper.

2.3 Connections

Figure 2-2. MC303 device board with power board MC300.

2.3.1 Power board connector

The MC303 processor board can connect directly to a driver board (typically the

MC300 power board). This is accomplished by a horizontal male pin header

connectors located on the right side of the board, shown in Figure 2-2.

The device board interface on MC303 connector is split into four eight-pin connectors.

Electric schematics and mechanical specifications are shown in Figure 2-3 and signal

description in Table 2-1.

AVR1014

8296A-AVR-03/10

Table 2-1. MC303 device board connector signal description.

Pin Located Name Direction Description

1 J1p1 GND -

2 J1p2 GND - System ground (Vin/VCC)

3 J1p3 GND -

4 J1p4 Vin Input Input power Vin (10-20V)

5 J1p5 VCC Input

6 J1p6 VCC Input Regulated power Vcc (3.3V/5V)

7 J1p7 VCC Input

8 J1p8 GND - System ground (Vin/VCC)

9 J2p1 UH Output Phase U Highside control output

10 J2p2 UL Output Phase U Lowside control output

11 J2p3 VH Output Phase V Highside control output

12 J2p4 VL Output Phase V Lowside control output

13 J2p5 WH Output Phase W Highside control output

14 J2p6 WL Output Phase W Lowside control output

15 J2p7 XH Output Phase X Highside control output

16 J2p8 XL Output Phase X Lowside control output

17 J3p1 GNDm - Motor ground (Vmotor)

18 J3p2 Vmotor’ Input Vmotor filtered/divided

19 J3p3 ShCom’ Input Voltage over ShCom filtered/divided

20 J3p4 ShU’ Input Voltage over ShU filtered/divided

21 J3p5 U’ Input BackEMF phase U filtered/divided

22 J3p6 ShV’ Input Voltage over ShV filtered/divided

23 J3p7 V’ Input BackEMF phase V filtered/divided

24 J3p8 ShW’ Input Voltage over ShW filtered/divided

25 J4p1 W’ Input BackEMF phase W filtered/divided

26 J4p2 ShX’ Input Voltage over ShX filtered/divided

27 J4p3 X’ Input BackEMF phase X filtered/divided

28 J4p4 GND - System ground (Vin/VCC)

29 J4p5 H1 Input Hall sensor 1 signal

30 J4p6 H2 Input Hall sensor 2 signal

31 J4p7 H3 Input Hall sensor 3 signal

32 J4p8 Vn’ Input Vn (neutral point) filtered/divided

25 J4p9 PFC_OC Input Power Factor Corrector Over Current signal

26 J4p10 nc -

27 J4p11 PFC_ZC Input Power Factor Corrector Zero Crossing signal

28 J4p12 nc -

29 J4p13 FAULT Input Fault signal from Power board

6 AVR1014 8296A-AVR-03/10

Pin Located Name Direction Description

30 J4p14 Temp Input Temperature sensor input

31 J4p15 nc -

32 J4p16 Spare Input/

Output Reserved

Figure 2-3. Device board connector schematics.

AVR1014

8296A-AVR-03/10

2.3.2 USB connector

The board has a USB mini B receptacle (J10) to interface with a PC using the USB

cable included in the kit.

Figure 2-4. USB Connection

2.3.3 DB101 Display module connectors

The board has three 2.54 mm header to mount the Atmel DB101 Display module: J5,

J7 & J9 (respectively UART, SPI, and TWI). The MC303 uses the UART.

Figure 2-5. DB101 Display module

DB101 TWI

header

DB101 UART

header

DB101 SPI

header

8 AVR1014 8296A-AVR-03/10

See the following description for the DB101 headers:

Figure 2-6. DB101 Header

2.3.4 JTAG/Debug connectors

The board has one JTAG/Debug connector, one populated for interfacing the

ATxmega128A1 (J8), one not populated for the AT90USB1287 (USB bridge) (J12).

Figure 2-7. ATxmega128A1 ISP/ JTAG header

Note that J12 for AT90USB1287 is not mounted

ISP/debugWire

header for

ATxmega128A1

Txme

a128A1

AVR1014

8296A-AVR-03/10

2.4 Jumpers

Refer to component floorplan for the location of the jumpers.

Table 2-2. Jumpers and their function.

J11 Selects voltage source UVCC (Power supply for USB stage)

When working at Vcc 2.7V-3.3V, the user can keep USB functional by

selecting power supply for USB coming from VBUS rather than from

Vcc.

J19 open – UVCC not connected, USB bridge not usable

J19 pin 1 & 2 connected – UVCC connected to Vcc coming from Power

board (default configuration)

J19 pin 2 & 3 connected – UVCC connected to Vbus coming from USB

line (See picture below)

Figure 2-8. J11: USB Power supply selection

2.5 Headers

Table 2-3. MC303 device board J13 Hall sensors header description.

Pin Located Name Direction Description

1 J13p1 VCC - Regulated power Vcc (3.3V/5V) coming from

power board

2 J13p2 H1 Hall sensor output 1

3 J13p3 H2 Hall sensor output 2

4 J13p4 H3 Hall sensor output 3

5 J13p5 GND - System ground (Vin/VCC)

J11 : USB power

supply selection

10 AVR1014 8296A-AVR-03/10

Figure 2-9. J13: HALL sensors header

J13: HALL

sensor header

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