AT88SA100S-TH-T Atmel, AT88SA100S-TH-T Datasheet - Page 14

• Manufacturer Part Number: AT88SA100S-TH-T
• Description: IC BATTERY AUTHENTICATION 8TSSOP
• Manufacturer: Atmel
• Series: CryptoAuthentication™r

Specifications of AT88SA100S-TH-T

• Function: Battery Authentication
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP (0.173", 4.40mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.1.
14
MAC
Computes a SHA-256 digest of the key, challenge and other fixed information on the chip to generate an output
response. If MemValid is not set, indicating that no valid key is stored in the SRAM, then this command will return
an error. The hashed message includes the following bytes, concatenated in this order:
Table 5-1.
Table 5-2.
Table 5-3.
Atmel AT88SA100S
Opcode
Param1
Param2
Data
Name
Response
Bit
6
0-5, 7
256-bits
256-bits
255-bits
16-bits
88-bits
32-bits
16-bits
16-bits
64-bits
8-bits
8-bits
8-bits
1-bit
Input Parameters
Output Parameters
Mode Encoding
Name
MAC
Mode
Zero
Challenge
Notes
If set, then the four bytes of Fuse SN and the two bytes of ROM SN will be included in the message,
otherwise these bits will be set to zero in the message
Ignored, must be all zero
Key (Stored in Sram)
Challenge
Opcode (always 0x08)
Mode input
Param2 input
All zeros
Fuse MfrID (Fuse[88-95])
Fuse SN (Fuse[96-127]) or zeros
ROM MfrID
ROM SN or zeros
1’s – SHA-256 padding
0’s – SHA-256 padding
Length (704) per SHA-256
Size
32
Notes
SHA-256 digest
Size
32
1
1
2
Notes
0x08
Refer to Table 5-3
Must be 0x00 00
Input portion of message to be digested
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