Maxim Integrated MAX15301 PMBus Command Set - Manual (Page 47)

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
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