Maxim-integrated MAX15301 PMBus Command Set Manuel d'utilisateur télécharger pdf (Page 42)

MAX15301 PMBus Command Set User’s Guide

Rev 1 Page 42 of 53

SECURITY_LEVEL

Reference:

Maxim Specific

Lockable:

N/A

Command Code:

0xE6

Format:

Direct

Data Bytes:

Units:

N/A

Transfer:

Read Byte

Factory Value:

0x00

Description/Notes:

The MAX15301 provides two levels of password protection for all writeable PMBus commands, on a

per-command basis. The SECURITY_LEVEL command value shows the present security level as follows:

SECURITY_LEVEL Description

0x00 No write access to commands locked by USER_CONF or MANUF_CONF

0x01 Write access granted to commands locked by USER_CONF

0x02 Write access granted to commands locked by MANUF_CONF and USER_CONF

Note that SECURITY_LEVEL is 0 until a value is written to USER_PASSWD or MANUF_PASSWD that

matches the working-memory value of USER_LOCK or MANUF_LOCK respectively.

When the working-memory value of USER_LOCK is written to USER_PASSWD, SECURITY_LEVEL is set

to 1.

When the working-memory value of MANUF_LOCK is written to MANUF_PASSWD, SECURITY_LEVEL is

set to 2.

Writing a “mismatched” (or wrong) value of USER_PASSWD or MANUF_PASSWD causes

SECURITY_LEVEL to reset to 0.

The values of USER_LOCK and USER_CONF can only be changed when SECURITY_LEVEL is 1 or 2.

The values of MANUF_LOCK and MANUF_CONF can only be changed when SECURITY_LEVEL is 2.

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Maxim-integrated MAX15301 PMBus Command Set Manuel d'utilisateur Page 42