AT88SA100S-TSU-T Atmel, AT88SA100S-TSU-T Datasheet - Page 2

• Manufacturer Part Number: AT88SA100S-TSU-T
• Description: IC BATTERY AUTHENTICATION SOT23-
• Manufacturer: Atmel
• Series: CryptoAuthentication™r
• Type: Battery Authentication Chipr

Specifications of AT88SA100S-TSU-T

• Function: Battery Authentication
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: TO-236-3, SC-59, SOT-23-3
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Interface Type: 1 Wire
• Minimum Operating Temperature: - 40 C
• Number Of Timers: 1
• Program Memory Size: 72 bit
• Program Memory Type: ROM
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 3
• Mounting: Surface Mount
• Case Length: 2.9mm
• Screening Level: Industrial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1.1.
1.2.
2
Memory Resources
Sram
MemValid
Fuse
ROM
ROM MfrID
ROM SN
RevNum
Fuse Map
The AT88SA100S chip incorporates 128 one-time fuses within the chip. Once burned, there is no way to reset the
value of a fuse. Fuses, with the exception of the manufacturing ID and serial number bits, which are initialized by
Atmel, have a value of one when shipped from the Atmel factory and transition to a zero when they are burned.
Table 1-1.
Atmel AT88SA100S
Fuse #
0 – 7
8  87
88  95
96  127
The 128 fuses in the Atmel AT88SA100S chip are arranged in the following manner:
Name
Fuse Lock Bits
Status Fuses
Fuse MfrID
Fuse SN
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
still supplied to the chip.
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
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 Atmel
AT88SA100S, this value is 0x23 01. (Appears on the bus: 0x01 23) ROM MfrID can be read
by accessing ROM bytes 0 & 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 two and three 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.
Description
Each bit, when zero, locks the current value of the corresponding 16-bit block of the fuse
array, see below for more details
These fuses can be written with the BurnFuse command and can always be read with the
Read command
See Section 1.3. Set by Atmel, can’t be modified in the field
See Section 1.3. Set by Atmel, can’t be modified in the field
®
. Fuse[96-127] are part of the serial number
8558E–SMEM–8/10
RETAIN
is