Atmel AVR943 User manual

Atmel AVR943: ATAVRBM300 User Guide
Features
• USB to serial interface converter
- USB1.1 device
• Converts USB to
- SMBus/TWI
- SPI
- UART
- Single-wire UART
• USB supply power for Atmel®BM300
• USB gateway to PC/Atmel AVR®Battery Studio 2
• LED status indication
• Supports the Atmel ATBMxxx-EK evaluation kits
1 Introduction
The Atmel ATAVRBM300 is a USB based communication tool that can be used to
communicate with Smart Battery systems by a PC. It supports four popular
interfaces used in Smart Battery system: SMBus/TWI, single-wire UART, UART,
and SPI. USB1.1 is used for connection with a PC. The product works as the USB
device while the PC is the USB host. The communication protocol is compliant with
SBS data specification v1.1, and some extended commands are added according
to the application requirement. PC software (Battery Studio 2) is required to
interpret the Smart Battery data.
Figure 1-1. ATAVRBM300.
8-bit Atmel
Microcontrollers
Application Note
Rev. 8463A-AVR-11/11

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2 Quick start
The following steps are required to install and start using the Atmel ATAVRBM300:
1. Install Atmel AVR Battery Studio 2.
2. Connect ATAVRBM300 to ATBMxxx-EK.
3. Connect ATAVRBM300 to a USB port of the PC.
4. Start AVR Battery Studio 2.
The install file of AVR Battery Studio 2 can be downloaded from the Atmel website:
www.atmel.com/BM300. The 10-pin communication port of ATAVRBM300 should be
connected to the communication port of ATBMxxx-EK as shown in Figure 2-1.
Figure 2-1. ATAVRBM300 connect to ATBMxxx-EK.
About AVR Battery Studio 2 introduction please refer to application note Atmel
AVR363 AVR Battery Studio 2 user guide.

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3 Interfaces
3.1 USB interface
The USB interface on the Atmel ATAVRBM300 module is USB Type B. The
ATAVRBM300 connects to a host computer via this interface. The ATAVRBM300 is
also powered by the USB port from the PC. The PC must deliver minimum 50mA to
power the ATAVRBM300. USB (USB 1.1, HID communication class) is used to
communicate between the PC and the ATAVRBM300. A PC USB driver is included in
Atmel AVR Battery Studio 2. This PC software must be installed before connecting
the ATAVRBM300 the first time.
3.2 Interfaces to device
The ATAVRBM300 supports four communication interfaces: SMBus/TWI, SPI, UART,
and single-wire UART. A 10-pin flat parallel cable includes all the signals from the
ATAVRBM300.
Table 3-1. Pins definition.
Pin number Pin name Description
1 SDA SMBus data pin
2 SCL SMBus clock pin
3 TXD UART transmit pin
4 RWD UART receive pin
5 SCLK SPI serial clock
6 MISO SPI Bus Master input/Slave output
7 MOSI SPI Bus Master output/Slave input
8 /SS SPI Slave select input
9 R/T Single-wire UART transmit/receive pin
10 GND Ground
Figure 3-1. 10-pin header definition.
3.2.1 SMBus
To use the SMBus interface, three pins are required: SCL, SDA, and GND. SMBus
specification v1.1 is supported.

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3.2.2 SPI
To use the SPI interface five pins are required: SCLK, MISO, MOSI, /SS, and GND.
3.2.3 UART
The UART interface needs three pins: TXD, RXD, and GND. A command-response
mechanism is employed on the communication through this port. All the transactions
are initiated by the host.
3.2.4 Single-wire UART
The single-wire UART interface uses two pins: T/R and GND. Through the two pins,
half duplex communication is implemented: only transmit or receive can be performed
at one time.

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4 LED indication
4.1 Red LED
This red LED is used to indicate whether the tool is powered. It will be bright when it
is powered.
4.2 Bi-color LED
The red-green LED is used to indicate the communication status.
Table 4-1. Bi-LED colors indication.
Color Description
Red LED blinking ATAVRBM300 is transmitting data to the target board
Green LED blinking ATAVRBM300 is receiving data from the target board
5 Communication protocols
The communication protocol between Atmel BM300 and Smart Battery is compliant
with SBS data specification v1.1. In addition, some extended commands are added
according to the application requirement. For more details about supported
commands, refer to the user guide for the specific ATBMxxx-EK you are using.

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6 EVALUATION BOARD/KIT IMPORTANCE NOTICE
This evaluation board/kit is intended for use for FURTHER ENGINEERING,
DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is
not a finished product and may not (yet) comply with some or any technical or legal
requirements that are applicable to finished products, including, without limitation,
directives regarding electromagnetic compatibility, recycling (WEEE), FCC, CE or UL
(except as may be otherwise noted on the board/kit). Atmel supplied this board/kit
“AS IS,” without any warranties, with all faults, at the buyer’s and further users’ sole
risk. The user assumes all responsibility and liability for proper and safe handling of
the goods. Further, the user indemnifies Atmel from all claims arising from the
handling or use of the goods. Due to the open construction of the product, it is the
user’s responsibility to take any and all appropriate precautions with regard to
electrostatic discharge and any other technical or legal concerns.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER
USER NOR ATMEL SHALL BE LIABLE TO EACH OTHER FOR ANY INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
No license is granted under any patent right or other intellectual property right of
Atmel covering or relating to any machine, process, or combination in which such
Atmel products or services might be or are used.
Mailing Address: Atmel Corporation, 2325 Orchard Parkway, San Jose, CA 95131

8463A-AVR-11/11
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