View detail for AT88Microbase Hardware User Guide

View detail for AT88Microbase Hardware User Guide
Atmel AT88Microbase Board
Hardware User Guide
Features
Contents
 Atmel AT90USB1287 (Atmel AVR) 64 QFN device
 Atmel AT88CKMicrobase
- 128K Bytes of in-system programmable flash
 6” USB cable
- 4K Bytes EEPROM
 Top module kit listed in Table 1-1
- 8K Bytes internal SRAM
 Atmel AT88SC108 CryptoCompanion IC
 Supports the Atmel ATSHA204 CryptoAuthentication
IC
 Serial interfaces
- USB (Full and Low Speeds)
- I2C
- UART
- SPI
 Power LED
 Three user definable LEDs
 RESET button
 HWB button
- Force the Atmel AVR into DFU mode at reset
- General purpose input switch
 16MHz system clock
8723A–CRYPTO–3/11
1.
Introduction
Atmel® AT88Microbase serves as a base module for the following crypto kits.
Table 1-1. Atmel Crypto kits
Atmel Crypto kits
Atmel kits
Supported Atmel device
Device footprint
─
Communication protocol
Socket(s)
2
SWI/I C
─
AT88CK201STK
CryptoRF
AT88CK101STK3
ATSHA204
SOT23-3
SWI
1
AT88CK101STK8
ATSHA204
8LD SOIC
SWI/I C
2
1
AT88CK109STK3
ATSHA204
SOT23-3
SWI
2
2
2
AT88CK109STK8
ATSHA204
8LD SOIC
SWI/I C
The AT88Microbase uses a convenient Type-A USB interface allowing users to interface with a personal
computer and experiment with Crypto kits. The small USB form factor of the AT88Microbase allows the
board to function as a demo as well as a development platform.
Figure 1-1.
Atmel AT88Microbase top side components
Power LED
JTAG Header
HWB Button
Protocol
Selector
LED Bank
10–Pin
Header
2
Buzzer
RESET
Atmel AT88Microbase Hardware User Guide
8723A–CRYPTO–3/11
Figure 1-2.
Atmel AT88Microbase bottom side components
R1 / R2
See section 1.1
CryptoCompanion
16MHz
1.1.
AVR
USB Powered
The on-board power supply circuitry allows two possible configurations for the main supply voltage.
Table 1-1. On-board power supply circuitry
Mounted Resistor
Main Board Supply Voltage
R1
3.3V
R2
5.0V ( USB )
Figure 1-3.
5.0 ( USB )
Comments
Default Setting
On-board power supply circuitry
3.3V
3.3V
Regulator
CryptoCompanion
R1
0
VCC
Main board
Supply Voltage
R2
* Default
The Atmel CryptoCompanion™ supply voltage is always 3.3V, regardless of R1and R2 configuration.
Note:
To operate the Atmel AT88Microbase below 4.5V, the 16MHz crystal must be replaced with an
8MHz crystal. The ABM3B-8.000MHZ-B2-T 8MHz crystal is a drop-in replacement.
Atmel AT88Microbase Hardware User Guide
8723A–CRYPTO–3/11
3
1.2.
Power LED (LEDP)
The blue LED (LEDP) is always lit when power is applied to the board regardless of the voltage
configuration. See section 1.3.
Figure 1-4.
1.3.
Power on LED “LEDP”
Description of LED bank
The AT88Microbase includes three general purpose red LEDs, which are connected to PD6, PD5, and PD4.
To light a LED, the corresponding port pin must be driven high. To turn off a LED, the corresponding port
pin must be driven low.
Figure 1-5.
Note:
4
LEDs implementation schematic
The Atmel AVR can source or sink enough current to drive an LED directly
Atmel AT88Microbase Hardware User Guide
8723A–CRYPTO–3/11
1.4.
Buzzer
The small onboard buzzer adds audio capability to the AT88Microbase board. The buzzer requires that
PD7 be driven with a square wave at 4.0  0.5KHz to achieve a maximum decibel of 78dB.
Figure 1-6.
Buzzer implementation schematic
Brief Spec:
1.5.
Input signal
Square wave
Resonant frequency
4.0  0.5KHz
Sound pressure level
78dB
General purpose switch
The AT88Microbase also includes one general purpose input switch, HWB. The HWB pushbutton switch
®
actually has dual functionality. Its primary function is to force the Atmel AVR into DFU mode at reset.
See section 1.6.2.1 for more details. Its secondary function is a general purpose input switch that is
connected to PA2.
Figure 1-7.
HWB schematic implementation
Atmel AT88Microbase Hardware User Guide
8723A–CRYPTO–3/11
5
1.6.
Description of interface header
The 10-Pin header (J1) of the AT88Microbase provides interfacing for daughter boards.
Figure 1-8.
10-pin interface header
Figure 1-9.
10-pin interface header (J1) orientation
HWB
JTAG
PB5
PB4
PB0
PB6
PB3 / PD2
PB7 / PD3
PB2/ PD1
J1
6
PB1/
PD0
SPI
USB
TWI
GND
VCC_D
RESET
Atmel AT88Microbase Hardware User Guide
8723A–CRYPTO–3/11
1.6.1. The Atmel CryptoCompanion chip
The AT88Microbase has one CryptoCompanion device (Atmel AT88SC018), which is located on the back
side of board. The AT88SC018 is designed as the mate to the Atmel CryptoRF® (CRF) and the Atmel
CryptoMemory® (CM) chips. The SCL and SDA pins are connected to PD0 and PD1, respectively. The RST
and PDN pins are connected to PF2 and PF3, respectively.
Figure 1-10. The Atmel CryptoCompanion implementation schematic
The datasheet can be found on the Atmel web site, http://www.atmel.com/products/securemem.
Note:
The Atmel CryptoCompanion chip cannot be used with the Atmel CryptoAuthentication™ family of
devices.
1.6.2. In-system programming
1.6.2.1.
Programming with USB bootloader: DFU (Device firmware upgrade)
The Atmel AT90USB1287 AVR comes with a default factory pre-programmed USB bootloader located in
the on-chip boot section of the AT90USB1287. This is the easiest and fastest way to reprogram the device
directly over the USB interface. The “Flip” PC side application, available for free on the Atmel website,
offers a flexible and user friendly interface for reprogramming the application over the USB bus.
The “HWB” push button is used to place the AVR into DFU mode after reset (Refer to the Atmel
AT90USB1287 datasheet section, “boot loader support.”)
The following steps enable the DFU mode:
1. Press and hold “HWB” button
2. Press the “RESET” button
3. Release the “RESET” button
4. Release the “HWB” button
For more information about the USB bootloader and FLIP software, please refer to the “USB Bootloader”
datasheet document and the, “FLIP User Manual.”
Note:
1.6.2.2.
HWBE fuse must be enabled to support DFU
Programming with the Atmel AVR JTAG ICE
The AT90USB1287 can be programmed using the specific JTAG link. This subsection will explain how to
connect and use the Atmel AVR JTAG ICE.
Atmel AT88Microbase Hardware User Guide
8723A–CRYPTO–3/11
7
Note:
When the JTAGEN fuse is disabled, the four TAP pins are normal port pins, and the TAP controller
is in reset. When the JTAGEN fuse is enabled, the input TAP signals are internally pulled high.
This enables the JTAG for boundary-scan and programming. The Atmel AT90USB1287 device is
shipped with this fuse programmed.
Figure 1-11. Connecting the Atmel AVR JTAGICE mkII to the Atmel AT88Microbase
The Flash, EEPROM, and all fuse and lock bit options ISP-programmable, can be programmed individually
or with the sequential automatic programming option.
Note:
1.6.2.3.
See the Atmel AVR Studio® on-line help for information.
Program debugging with the Atmel AVR JTAGICS mkII
Connect the JTAG ICE mkII as shown in Figure 1-11, for debugging help. Please refer to AVR Studio help
information.
When using JTAG ICE MK II for debugging, and as AT90USB1287 parts are factory configured with the
higher security level set, a chip erase operation will be performed on the part before debugging. Thus the
on-chip flash bootloader will be erased. It can be restored after the debug session using the bootloader
hex file available from the Amel website.
2.
References and further information
Schematics, gerber files, bill of materials (BOM), development and demonstration software are
conveniently downloadable from the Atmel website at www.atmel.com/cryptokits.
8
Atmel AT88Microbase Hardware User Guide
8723A–CRYPTO–3/11
3.
EVALUATION BOARD/KIT IMPORTANT NOTICE
This evaluation board/kit is intended for ENGINEERING, DEVELOPMENT, DEMONSTRATION, or
EVALUATION PURPOSE 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 limitations,
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 responsibly and liability for
proper and safe handling of goods. Further, the user indemnifies Atmel from claims arising from the
handling or use of goods. Due to 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 INDEMNITY SET FORTH ABOVE, NEITHER USER NOR ATMEL SHALL BE
LIABLE TO EACH OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
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relating to any machine, process, or combination in which such Atmel product or services might be or are
used.
Mailing Address: Atmel Corporation
2325 Orchard Parkway
San Jose, CA 95131
Atmel AT88Microbase Hardware User Guide
8723A–CRYPTO–3/11
9
Atmel Corporation
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© 2011 Atmel Corporation. All rights reserved. / Rev.: 8723A–CRYPTO–3/11
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