Instruction Manual

MAX15303 PMBus Command Set User’s Guide
Page 30 of 52
READ_TEMPERATURE_1
Reference:
Standard Command
Lockable:
N/A
Command Code:
0x8D
Format:
Linear
Data Bytes:
2
Units:
°C
Transfer:
Read Word
Factory Value:
N/A
Description/Notes:
See Section 18.6 of the PMBus Specification Part II.
The MAX15303 uses READ_TEMPERATURE_1 to report its internal (i.e., die) temperature.
READ_TEMPERATURE_2
Reference:
Standard Command
Lockable:
N/A
Command Code:
0x8E
Format:
Linear
Data Bytes:
2
Units:
°C
Transfer:
Read Word
Factory Value:
N/A
Description/Notes:
See Section 18.6 of the PMBus Specification Part II.
The MAX15303 uses READ_TEMPERATURE_2 to report external temperature as measured by an
external diode junction, typically placed near the power inductor to facilitate READ_IOUT
temperature compensation.
If no external diode junction is detected, READ_TEMPERATURE_2 returns a value of -273°C and is not
used for temperature faults or READ_IOUT temperature compensation.
The Maxim-specific command EXT_TEMP_CAL
can be used to adjust the diode ideality factor to
match that of the actual diode junction used for external temperature sensing and to add or remove
a fixed temperature offset for calibration purposes.
READ_DUTY_CYCLE
Reference:
Standard Command
Lockable:
N/A
Command Code:
0x94
Format:
Linear
Data Bytes:
2
Units:
%
Transfer:
Read Word
Factory Value:
N/A
Description/Notes:
See Section 18.9 of the PMBus Specification Part II.
The READ_DUTY_CYCLE command returns an averaged measure of the pulse-width modulator output
value in percent. The duty-cycle value is averaged over 256 PWM cycles.
READ_FREQUENCY
Reference:
Standard Command
Lockable:
N/A
Command Code:
0x95
Format:
Linear
Data Bytes:
2
Units:
kHz
Transfer:
Read Word
Factory Value:
N/A
Description/Notes:
See Section 18.10 of the PMBus Specification Part II.