Features
• Secure authentication and validation device
• Integrated capability for both host and client operations
• Superior SHA-256 hash algorithm, HMAC option
• Best–in-class, 256-bit key length; storage for up to 16 keys
• Guaranteed unique 72-bit serial number
• Internal, high-quality random number generator
Atmel
CryptoAuthentication™
• 4.5K-bit EEPROM for keys and data
• 512 OTP bits for fixed information
• Multiple I/O options
− High-speed, single-pin interface
− 1MHz I2C interface
Atmel ATSHA204
• 2.0V – 5.5V supply voltage range
• 1.8V – 5.5V communications
• <150nA sleep current
Authentication Chip
• Extended, multi-level hardware security
• Optional integrated temperature sensor
• 8-lead SOIC, 8-lead TSSOP, 3-lead SOT23, 8-pad UDFN, and
3-pad contact packages
Applications
• Anti-clone protection for accessories, daughter cards, and consumables
• Secure boot validation, software anti-piracy
• Network and computer access control
• Key exchange for encrypted downloads
• Authenticated/encrypted communications for control networks
Figure 1.
Pin name
Pin configurations
Function
SDA
Serial data
SCL
Serial clock input
GND
Ground
VCC
Power supply
8-lead UDFN
VCC 8
7
2
SCL 6
SDA 5
3
8-lead SOIC
1
NC
NC
4 GND
Bottom view
1
8
2
7
NC
GND
3
6
4
5
VCC
NC
SCL
SDA
3-lead SOT23
2
GND
VCC
1
SDA
3
8740B−CRYPTO−5/11
