AT88SA100S-SH-CZ-T ATMEL [ATMEL Corporation], AT88SA100S-SH-CZ-T Datasheet - Page 15

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

6.3
BurnFuse
Burns one of the 88 user accessible fuse bits.
The values in fuses #88-127 are reserved for Fuse MfrID and Fuse SN and cannot be blown via this command. All addresses
above 0x57 (87) will result in an error.
Fuses, with the exception of those initialized by Atmel, have a value of one on shipment from the Atmel factory and transition
to a zero when they are burned.
Fuse bits zero through seven of the fuse array are word lock bits. Burning one of these has the effect of locking the
corresponding 16-bit word within Fuse. Bit 0 locks fuses 0-15, bit 1 locks fuses 16-31 and so on. If bit 0 is burned, then the
value of the lock bits can no longer be changed. The values of lock bits six and seven are ignored by the chip.
The power supply pin must meet the V
Vcc is greater than or equal to 3.7 V, then the BurnTime parameter should be set to 0x00 and the internal burn time will be
250µs. If Vcc is less than 3.7 V but greater than V
burn time will be up to 262ms. The chip does not internally check the supply voltage level.
There is a very small interval during t
supply must not be removed and the watchdog timer must not be allowed to expire or the fuse may end up in a state where it
reads as un-burned but cannot be burned.
Table 6-7.
Table 6-8.
Opcode
Param1
Param2
Data
Name
Success
Input Parameters
Output Parameters
Name
BURNFUSE
FuseNum
BurnTime
–
Size
1
Notes
Upon successful completion, a value of 0 will be returned by the Atmel AT88SA100S
Size
EXEC_BURN
1
1
2
0
BURN
specification during the entire BurnFuse command in order to burn fuses reliably. If
Notes
0x04
Which bit within fuse array, minimum value is 0, and maximum value is 87
Must be 0x0000 if Vcc >=3.7 V; must be 0xFFFF otherwise
when the fuse element is actually being burned. During this interval, the power
BURN
then the BurnTime parameter should be set to 0xFFFF and the internal
Atmel AT88SA100S [DATASHEET]
8558F−CRYPTO−9/11
15