AT88SA100S-SH-CZ-T ATMEL [ATMEL Corporation], AT88SA100S-SH-CZ-T Datasheet - Page 2

• Manufacturer Part Number: AT88SA100S-SH-CZ-T
• Description: Atmel CryptoAuthentication Battery Authentication Chip
• Manufacturer: ATMEL [ATMEL Corporation]

1.
1.1
Introduction
The Atmel
that contain a power source. It uses the industry leading SHA-256 hash algorithm to provide the ultimate level of security.
An industry leading key length of 256-bits prevents exhaustive attacks while multiple physical security features prevent
unauthorized disclosure of the secret key stored within the chip. This key is automatically erased when power is removed from
the AT88SA100S.
It is shipped with a guaranteed unique 48-bit serial number that is used in combination with an input challenge and the stored
secret key to generate a response that is unique for every individual AT88SA100S.
The chip also includes 80 one-time fuses that can be used to configure the system and/or retain permanent status. The values
in these fuses can also be locked to prevent modification.
Memory Resources
Sram
MemValid
Fuse
ROM
ROM MfrID
ROM SN
RevNum
®
AT88SA100S is a small authentication chip that can be used to validate battery packs and other replaceable items
256-bits of SRAM are used for storage of a key. The LoadSram command provides a mechanism to
securely initialize this block during personalization. This memory will retain its value when the chip is
put/goes to sleep, so long as a supply voltage in excess of V
A single bit that tells whether or not SRAM contains valid data. It’s cleared when power is lost and set
when the SRAM is loaded with a secret key.
Block of 128-fuse bits that can be read and written through the one wire interface. The first 8-bits are
lock bits that control burn ability on 16-bit words of the array. Fuse[88-95] are part of the manufacturing
ID values fixed by Atmel. Fuse[96-127] are part of the serial number programmed by Atmel which is
guaranteed to be unique. See Section 1.3 for more details on the Manufacturing ID and Serial Number.
Metal mask programmed memory. Unrestricted reads are permitted on the first 64-bits of this array. The
physical ROM will be larger and will contain other information that cannot be read.
Two bytes of ROM that specifies part of the manufacturing ID code. This value is assigned by Atmel
and is always the same for all chips of a particular model number. For the AT88SA100S, this value is
0x2301. (Appears on the bus: 0x0123), ROM MfrID can be read by accessing ROM bytes 0 and 1 of
Address 0.
Two bytes of ROM that can be used to identify chips among others on the wafer. These bits reduce the
number of fuses necessary to construct a unique serial number. The ROM SN is read by accessing
ROM bytes 2 and 3 of Address 0. The serial number can always be read by the system and is optionally
included in the message digested by the MAC command.
Four bytes of ROM that are used by Atmel to identify the design revision of the AT88SA100S chip.
These bytes can be freely read as the four bytes returned from ROM Address 1, however system code
should not depend on this value as it may change from time to time.
Atmel AT88SA100S [DATASHEET]
RETAIN
is still supplied to the chip.
8558F−CRYPTO−9/11
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