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MAX15303 PMBus Command Set User’s Guide
Page 40 of 52
USER_CONF
memory value of USER_LOCK, then the MAX15303 will ignore attempts to write data to that
command.
Note that setting a bit for a read-only PMBus command or send-byte PMBus command has no effect,
regardless of SECURITY_LEVEL. Likewise, read operations for any PMBus command are never blocked
on the basis of USER_CONF and SECURITY_LEVEL.
The 32 data bytes for USER_CONF are saved in flash memory as a unique, single instance (i.e., not as
part of the USER, DEFAULT, or MAXIM PMBus command stores.) The data is written to flash every
time the USER_CONF command data is written to the MAX15303.
Wait
at least 350ms for execution after sending the USER_CONF command before sending additional
PMBus commands.
USER_LOCK
Reference:
Maxim Specific
Lockable:
Yes
Command Code:
0xE4
Format:
Direct
Data Bytes:
2
Units:
N/A
Transfer:
Read Word
Factory Value:
0x0000
Description/Notes:
The USER_LOCK command contains the password value for the “user” PMBus command security
level. If the working-memory value of USER_PASSWD matches the working-
memory value of
USER_LOCK, the SECURITY_LEVEL value is set to 1, and any PMBus commands flagged in USER_CONF
are unlocked for write operations.
Note that SECURITY_LEVEL must be set to 1 before a new value can be written to USER_LOCK.
The value of USER_LOCK can be stored in both the USER and DEFAULT nonvolatile PMBus memory
with separate and distinct values –
this should be taken into account when setting up command
security.
USER_PASSWD
Reference:
Maxim Specific
Lockable:
Yes
Command Code:
0xE5
Format:
Direct
Data Bytes:
2
Units:
N/A
Transfer:
Read/Write Word
Factory Value:
N/A
Description/Notes:
The USER_PASSWD command is the “key” or password-attempt command used to unlock the “user”
security level. If the working-memory value of USER_PASSWD matches the working-memory value of
USER_LOCK, the SECURITY_LEVEL value is set to 1, and any PMBus commands flagged in USER_CONF
are unlocked for write operations.
The value of USER_PASSWD is only retained in working memory and cannot be stored.
- MAX15303 PMBus Command Set 1
- User’s Guide 1
- Introduction 2
- Table of Contents 2
- OPERATION 6
- ON_OFF_CONFIG 6
- VIN_OFF 7
- VOUT_MODE 9
- VOUT_COMMAND 9
- VOUT_TRIM 10
- VOUT_CAL_OFFSET 10
- VOUT_MAX 10
- VOUT_MARGIN_HIGH 11
- VOUT_MARGIN_LOW 11
- VOUT_TRANSITION_RATE 12
- VOUT_DROOP 12
- FREQUENCY_SWITCH 14
- INTERLEAVE 14
- POWER_GOOD_ON 16
- POWER_GOOD_OFF 16
- TON_DELAY 17
- TON_RISE 17
- TOFF_DELAY 17
- TOFF_FALL 18
- Fault-Related Commands 19
- VOUT_OV_FAULT_RESPONSE 20
- VOUT_UV_FAULT_LIMIT 20
- VOUT_UV_FAULT_RESPONSE 20
- IOUT_OC_FAULT_LIMIT 21
- IOUT_OC_FAULT_RESPONSE 21
- OT_FAULT_LIMIT 22
- OT_FAULT_RESPONSE 23
- OT_WARN_LIMIT 23
- VIN_OV_FAULT_LIMIT 24
- VIN_OV_FAULT_RESPONSE 24
- VIN_UV_FAULT_LIMIT 25
- VIN_UV_FAULT_RESPONSE 25
- Unit Status Commands 27
- STATUS_INPUT 28
- STATUS_TEMPERATURE 28
- STATUS_CML 28
- Telemetry Commands 29
- READ_TEMPERATURE_1 30
- READ_TEMPERATURE_2 30
- READ_DUTY_CYCLE 30
- READ_FREQUENCY 30
- PMB_VALUES 31
- Calibration Commands 33
- EXT_TEMP_CAL 34
- CAPABILITY 35
- PMBUS_REVISION 35
- MFR_MODEL 36
- MFR_REVISION 36
- MFR_LOCATION 36
- MFR_DATE 36
- MFR_SERIAL 37
- IC_DEVICE_ID 37
- IC_DEVICE_REV 37
- Security Commands 38
- MANUF_LOCK 39
- MANUF_PASSWD 39
- USER_CONF 39
- USER_LOCK 40
- USER_PASSWD 40
- SECURITY_LEVEL 41
- Memory and Storage Commands 42
- RESTORE_DEFAULT_ALL 43
- STORE_USER_ALL 43
- RESTORE_USER_ALL 44
- RESTORE_MAXIM_ALL 45
- STRAP_DISABLE 45
- Control Loop Commands 47
- FEEDBACK_EFFORT 48
- LOOP_CONFIG 48
- COMP_MODEL 49
- DEADTIME_GCTRL 49
- Trademarks 51
- Revision History 52
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