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

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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.

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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.
1
2
3
3
3
4
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

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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.

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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

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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.

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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

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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
A
Txme
g
a128A1

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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

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Figure 2-9. J13: HALL sensors header
J13: HALL
sensor header

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2.6 Schematics, component floorplan and bill of materials
The schematics, component floorplan and bill of materials (BOM) for MC303 are
found as separate PDF files distributed with this application note. They can be
downloaded from http://www.atmel.com.

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3 Detailed description
3.1 Sensor mode
The MC303 can be configured in sensor mode using the Hall sensors of the motor
through the Power board interface (J1).
H1, H2 & H3 are connected to PE0, PE1 & PE2 of the ATxmega128A1.
3.2 Sensorless modes
The MC303 can be configured in sensorless mode thanks to the comparator circuitry
populated on the MC303 board or the filtered U, V, W signals coming from the MC300
power board. It supports both configurations at the same time.
When using the zero crossing signals output from comparators, ZC_U, ZC_V &
ZC_W are connected to PH0, PH1 & PH2 of the ATxmega128A1.
When using the filtered U, V, W signals coming from the MC300 power board,
(U_Conditioned, V_ Conditioned, W_ Conditioned) & (U_cond_neg, V_cond_neg,
W_cond_neg) are connected to (PA2, PA3, PA4) & (PA0, PA1, PA7) of the
ATxmega128A1.

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3.3 Interfacing MC303 with PC through USB
Commands & status can be transferred to a PC through a USB link thanks to the USB
bridge on the MC303.
3.3.1 Connection
Connect the USB mini B cable to the MC303 board and to a PC. Make sure J11
(power supply of USB bridge) is properly configured.
3.3.2 Communication
MC303 USB interface uses USB CDC class for communication. As the Atmel Motor
Control Center software uses the RS232 interface, CDC class fits perfectly with the
needs of this software. MC303 is delivered with a native USB CDC firmware in the
AT90USB1287.
3.3.3 USB bridge update
MC303 USB bridge can be updated thanks to the Atmel Bootloader in the
AT90USB1287. Press Program Push button then Reset the USB device by pressing
the Reset Push button. AT90USB1278 will then enumerate in DFU class (Device
Firmware Upgrade class). See Atmel FLIP user’s guide for upgrading the
AT90USB1287 device on Atmel web site: www.atmel.com
Figure 3-1. Entering in bootloader or start the application.
Push button to enter
into USB bootloader.

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3.3.4 Atmel Motor Control Center
The Atmel Motor Control Center used with the MC303 is available on the Atmel
website: www.atmel.com.
Figure 3-2. Motor Control Center User Interface.
See Atmel Motor control center user’s guide & the application notes using
MC303+MC300 & Atmel Motor Control center for further explanation on this PC
software usage.

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3.4 Interfacing MC303 with Atmel DB101 Display module
The DB101 display module can be added to the MC303 (See application notes
AVR481, AVR482, and AVR483 on www.atmel.com).
3.4.1 Connection
DB101 connects using 3 headers J5, J6 & J7 (respectively UART, SPI, and TWI).
See Figure 3-3. MC303 PCB layout
Figure 3-4. DB101 Display Module
3.4.2 Communication
DB101 uses the Usart with ATxmega128A1 through J5 header.

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3.5 Upgrading the MC303 Motor control firmware
Firmware on the MC303 can be updated through AVR Studio using JTAGICE mkII
connected to J8.
Select the ATxmega128A1 device in the device list.
The list of jumpers J15, J16, J17 and J18 should be left open to activate the JTAG
lines on the board:
Table 3-1. JTAG enable jumpers
Jumper JTAG Signal
J15 TMS
J16 TDI
J17 TCK
J18 TDO
Figure 3-5. JTAG Jumpers
CAUTION:
While updating the firmware, it is recommended to disconnect the motor on the
MC300 power board.
JTAG
Jumpers

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D
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