AT88SC0104CA-SH Atmel, AT88SC0104CA-SH Datasheet - Page 13

• Manufacturer Part Number: AT88SC0104CA-SH
• Description: EEPROM CryptoMemory, 1Kbit, 4Zone, 8SOIC, GRN
• Manufacturer: Atmel

Specifications of AT88SC0104CA-SH

• Rohs: yes
• Factory Pack Quantity: 12000

10.5
10.6
10.7
10.8
10.9
11.
Cryptographic Message Authentication Codes
AT88SC0104CA implements a data validity check function in the standard, authentication or encryption modes of operation.
In the standard mode, data validity check is done through a Modification Detection Code (MDC), in which the host may read
an MDC from the device in order to verify that the data sent was received correctly.
In authentication and encryption modes, the data validity check becomes more powerful since it provides a bidirectional data
integrity check and data origin authentication capability in the form of a Message Authentication Codes (MAC). Only the
host/device that carried out a valid authentication is capable of computing a valid MAC. While operating in the authentication
or encryption modes, the use of MAC is required. For an ingoing command, if the device calculates a MAC different from the
MAC transmitted by the host, not only is the command abandoned but the security privilege is revoked. A new authentication
and/or encryption activation will be required to reactivate the MAC.
Encryption
The data exchanged between the device and the host during read, write and verify password commands may be encrypted to
ensure data confidentiality.
The issuer may choose to require encryption for a user zone by settings made in the configuration memory. Any one of four
keys may be selected for use with a user zone. In this case, activation of the encryption mode is required in order to read/write
data in the zone and only encrypted data will be transmitted. Even if not required, the host may still elect to activate encryption
provided the proper keys are known.
Supervisor Mode
Enabling this feature allows the holder of one specific password to gain full access to all eight password sets, including the
ability to change passwords.
Modify Forbidden
No write access is allowed in a user zone protected with this feature at any time. The user zone must be written during device
personalization prior to blowing the security fuses.
Program Only
For a user zones protected by this feature, data can only be programmed (bits change from a “1” to a “0”), but not erased (bits
change from a “0” to a “1”).
Protocol Selection
The AT88SC0104CA supports two different communication protocols.
The power-up sequence determines establishes the communication protocol for use within that power cycle. Protocol selection
is allowed only during power-up.
•
•
Smartcard Applications:
Embedded Applications:
Smartcard applications use ISO 7816-B protocol in asynchronous T = 0 mode for compatibility and interoperability
with industry standard smartcard readers.
A two-wire serial interface provides fast and efficient connectivity with other logic devices or microcontrollers.
Atmel AT88SC0104CA [SUMMARY DATASHEET]
5200FS−CRYPTO−12/11
13