Instruction Manual

MAX15303 PMBus Command Set User’s Guide
Page 16 of 52
Output Voltage Sequencing Commands
POWER_GOOD_ON
Reference:
Standard Command
Lockable:
Yes
Command Code:
0x5E
Format:
Unsigned integer mantissa
Data Bytes:
2
Units:
V
Transfer:
Read/Write Word
Factory Value:
0x1135 (1.080V)
Description/Notes:
See Section 15.32.1 of the PMBus Specification Part II.
POWER_GOOD_ON mantissa data sent to and from the MAX15303 must be divided by 4096 to
determine the actual voltage value, according to the fixed value of VOUT_MODE
.
In the MAX15303, there are seven possible output voltage ranges based on seven corresponding
internal feedback divider taps. The MAX15303 hardware has 8-bit resolution for the power-good
threshold within each of these seven ranges.
The desired value of POWER_GOOD_ON is retained in memory, regardless of limitations imposed by
the feedback divider range and the 8-bit fault limit resolution, but the read-back value is based on
actual hardware register settings.
The factory value of 0x1135 (1.080V) will be overridden during initialization to
VOUT_COMMAND x 0.95, unless a specific value has been written to the User Store.
POWER_GOOD_OFF
Reference:
Standard Command
Lockable:
Yes
Command Code:
0x5F
Format:
Unsigned integer mantissa
Data Bytes:
2
Units:
V
Transfer:
Read/Write Word
Factory Value:
0x0F99 (0.980V)
Description/Notes:
See Section 15.32.2 of the PMBus Specification Part II.
POWER_GOOD_OFF mantissa data sent to and from the MAX15303 must be divided by 4096 to
determine the actual voltage value, according to the fixed value of VOUT_MODE
.
In the MAX15303, there are seven possible output voltage ranges based on seven corresponding
internal feedback divider taps. The MAX15303 hardware has 8-bit resolution for the power-good
threshold within each of these seven ranges.
The desired value of POWER_GOOD_OFF is retained in memory, regardless of limitations imposed by
the feedback divider range and the 8-bit fault limit resolution, but the read-back value is based on
actual hardware register settings.
The factory value of 0x0F99 (0.980V) will be overridden during initialization to
VOUT_COMMAND x 0.93, unless a specific value has been written to the User Store.