Manual
MAX15301 PMBus Command Set User’s Guide
Rev 1 Page 47 of 53
STRAP_DISABLE
Reference:
Maxim Specific
Lockable:
Yes
Command Code:
0xDC
Format:
Bit field
Data Bytes:
2
Units:
N/A
Transfer:
Read/Write Word
Factory Value:
0x0000
Description/Notes:
Several commands in the MAX15301 can be set directly by resistor value connected to a device pin,
or are set indirectly according to the value of other pin-configurable commands. Of these “pin-
configurable” commands, the STRAP_DISABLE command keeps track of those that have been directly
altered by a user through the SMBus serial interface.
When one of the commands in the table below is edited, the corresponding bit-
flag in
STRAP_DISABLE is set, and this flag prevents the device from automatically setting the value of that
command in the future, preserving the user-set value instead.
Note that the STRAP_DISABLE command can be saved in the USER and DEFAULT nonvolatile stores. In
order to disable pin-configuration of a command, the flag for that command must be 1, and a
STORE_USER_ALL
operation must have been performed, to ensure that the device powers up with
the flag set in the working-memory version of STRAP_DISABLE. (This process is handled automatically
without need for special user interaction in most situations.)
To restore pin-configuration capability for a command, clear the corresponding bit in STRAP_DISABLE
and send the STORE_USER_ALL command.
Bit
Command
Comments
15 INTERLEAVE
Command set indirectly by the SMBus slave address, from
R
ADDR0
and R
ADDR1
resistor values. (Note that this STRAP_DISABLE
bit is not actually used in the INTERLEAVE pin-strapping
decision; any non-zero value of INTERLEAVE cancels the
determination of phase relationship based on the PMBus
address.)
14 COMP_MODEL
The F
LC
data is set automatically by the parametric extraction
process
13
VOUT_MAX
Command set indirectly according to VOUT_COMMAND x 110%
12
IOUT_CAL_GAIN
Command set by R
ADDR1
resistor value
11
FREQUENCY_SWITCH
Command set by R
SYNC
resistor value
10
<RESERVED>
9
IOUT_OC_FAULT_LIMIT
Command not set automatically; flag is for future sue
8
VOUT_MARGIN_LOW
Command set indirectly according to VOUT_COMMAND x 95%
7
VOUT_MARGIN_HIGH
Command set indirectly according to VOUT_COMMAND x 105%
6
POWER_GOOD_OFF
Command set indirectly according to VOUT_COMMAND x 85%
5
POWER_GOOD_ON
Command set indirectly according to VOUT_COMMAND x 90%
4
VOUT_UV_WARN_LIMIT
Undervoltage warning is not implemented
3
VOUT_UV_FAULT_LIMIT
Command set indirectly according to VOUT_COMMAND x 85%
2
VOUT_OV_WARN_LIMIT
Overvoltage warning is not implemented
1
VOUT_OV_FAULT_LIMIT
Command set indirectly according to VOUT_COMMAND x 115%
0
VOUT_COMMAND
Command set by R
SET
resistor value