Manual

MAX15301 PMBus Command Set User’s Guide
Rev 1 Page 30 of 53
Telemetry Commands
READ_VIN
Reference:
Standard Command
Lockable:
N/A
Command Code:
0x88
Format:
Linear
Data Bytes:
2
Units:
V
Transfer:
Read Word
Factory Value:
N/A
Description/Notes:
See Section 18.1 of the PMBus Specification Part II.
The MAX15301 has 12-bit measurement resolution for input voltage to a maximum value of about
14.75V.
READ_VOUT
Reference:
Standard Command
Lockable:
N/A
Command Code:
0x8B
Format:
Unsigned integer mantissa
Data Bytes:
2
Units:
V
Transfer:
Read Word
Factory Value:
N/A
Description/Notes:
See Section 18.4 of the PMBus Specification Part II.
The value of VOUT_TRIM is not subtracted from READ_VOUT, so non-zero VOUT_TRIM values will
result in a difference between VOUT_COMMAND and READ_VOUT.
The value of VOUT_CAL_OFFSET is subtracted from READ_VOUT, so VOUT_CAL_OFFSET values never
result in a difference between VOUT_COMMAND and READ_VOUT.
READ_IOUT
Reference:
Standard Command
Lockable:
N/A
Command Code:
0x8C
Format:
Linear
Data Bytes:
2
Units:
A
Transfer:
Read Word
Factory Value:
N/A
Description/Notes:
See Section 18.5 of the PMBus Specification Part II.
The MAX15301 has 8-bit measurement resolution for load current over a variable, symmetric bipolar
range of inductor DCR voltage. READ_IOUT data is filtered and decimated, so reported load current
may display greater than 8-bit resolution.
READ_IOUT must be calibrated by means of IOUT_CAL_GAIN and IOUT_CAL_OFFSET
to achieve
accurate results.
The value of READ_IOUT is temperature compensated for sense-element resistance change according
to READ_TEMPERATURE_2
and the resistive temperature coefficient value in the third data byte of
EXT_TEMP_CAL.