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ADM1266ACPZ-R7 数据表(PDF) 25 Page - Analog Devices

部件名 ADM1266ACPZ-R7
功能描述  Cascadable Super Sequencer Margin Control and Fault Recording
PDF  62 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADM1266ACPZ-R7 数据表(HTML) 25 Page - Analog Devices

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Data Sheet
ADM1266
Rev. A | Page 25 of 62
PASSWORD PROTECTION
Specific commands are password protected to avoid unintended
modification of the firmware, sequence, and project configuration
data in the ADM1266. These commands must be unlocked only
when updating the firmware, sequence, and project configuration
data. Table 9 shows the list of password protected commands. It
is not required to unlock the device for regular operation. The
password is 16 bytes, and for the default password, those 16 bytes
are all 0xFF.
Table 9. Password Protected Commands
Command
Address
UPDATE_FW
0xFC
SEQUENCE_CONFIGURATION
0xD6
SYSTEM_CONFIGURATION
0xD7
LOGIC_CONFIGURATION
0xE0
USER_DATA
0xE3
STORE_USER_ALL
0x15
REFRESH_FLASH
0xF5
ERASE_MEMORY
0xFB
MEMORY_CONFIGURATION
0xF8
UNLOCKING THE DEVICE
The ADM1266 can be unlocked by performing two consecutives
writes of the correct password to the FW_PASSWORD command
(Register 0xFD). The block write command for unlocking the
device is shown in Figure 16.
The unlock status can be confirmed by the PART_LOCKED bit
of the STATUS_MFR_SPECFIC command (Register 0x80)
which is set to 0 when the device is successfully unlocked.
LOCKING THE DEVICE
Upon a power cycle, the device is automatically locked. The
device can also be locked by writing any 17 bytes of data once to
the FW_PASSWORD command (Register 0xFD). The block
write command for locking the device is shown in Figure 17.
The lock status can be confirmed by the PART_LOCKED bit of
the STATUS_MFR_SPECFIC (Register 0x80) command, which
is set to 1 when the device is successfully locked.
CHANGING THE PASSWORD
The password can be changed by the user to any 16-byte value.
For password less than 16 bytes, set the remaining bytes as 0x00.
To update the password, the device must be unlocked by following
the procedure described in the Unlocking the Device section.
After the device is unlocked, the new password must be written
two consecutive times to the FW_PASSWORD command
(Register 0xFD). The block write command for changing the
password is shown in Figure 18.
After the password is updated, the new password is immediately
committed to the memory. The device is automatically locked
and must be unlocked using the new password.
S
7-BIT
SLAVE
ADDRESS
BYTE
COUNT = 17
W
A
A
A
0xFD
A
A
...
= MASTER-TO-SLAVE
= SLAVE-TO-MASTER
A
P
PASSWORD
BYTE 1
PASSWORD
BYTE 16
PASSWORD
COMMAND = 2
Figure 16. Block Write Command for Unlocking the Device
S
7-BIT
SLAVE
ADDRESS
BYTE
COUNT = 17
W
A
A
A
0xFD
A
A
...
= MASTER-TO-SLAVE
= SLAVE-TO-MASTER
A
P
PASSWORD
BYTE 1
PASSWORD
BYTE 16
PASSWORD
COMMAND = 3
Figure 17. Block Write Command for Locking the Device
S
7-BIT
SLAVE
ADDRESS
BYTE
COUNT = 17
W
A
A
A
0xFD
A
A
...
= MASTER-TO-SLAVE
= SLAVE-TO-MASTER
A
P
NEW PASSWORD
BYTE 1
PASSWORD
COMMAND = 1
NEW PASSWORD
BYTE 16
Figure 18. Block Write Command for Changing the Password



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