ATSC018-SU-CM ATMEL [ATMEL Corporation], ATSC018-SU-CM Datasheet - Page 8

• Manufacturer Part Number: ATSC018-SU-CM
• Description: AT90USB1287 (AVR) 64 QFN device (2.7V < VCC < 5.5V)
• Manufacturer: ATMEL [ATMEL Corporation]

AT88SCK109STK3
3.2
3.2.1
3-6
8699A—CRYPTO—10/09
Power Supply
USB powered
CryptoCompanion
AT88SC108
Figure 3.
The on-board power supply circuitry allows two possible configurations for the main supply voltage.
The CryptoCompanion supply voltage is always 3.3V, regardless of R1and R2 configuration.
5.0 ( USB )
Mounted Resistor
16MHz
Crystal
AT88Microbase Components (back side)
R1
R2
AT90USB1287
AVR
Regulator
3.3V
Supply Voltage
5.0V ( USB )
Main Board
Supply Voltage
*see section 3.2.1
Main board
* Default
3.3V
R2
0
3.3V
R1
CryptoCompanion
VCC
Main board
Supply Voltage
Default Setting
Comments
AT88CK109STK3 User Guide