Manual

MAX15301 PMBus Command Set User’s Guide
Rev 1 Page 2 of 53
Introduction
Maxim Integrated InTune™ digital power products utilize the PMBus™ command standard for configuration, control and
telemetry.
This document lists and describes the PMBus commands implemented in the MAX15301 digital DC-DC controller. Standard
commands from the PMBus specification are not described in detail unless there are deviations from the PMBus
specification functionality. Maxim manufacturer-specific commands are fully described in this document.
References for this document are found on the PMBus and SMBus organization websites.
http://pmbus.org/specs.html
http://smbus.org/specs/
The commands in this document are presented in the following format:
<COMMAND_NAME>
Reference:
<”Standard” or “Maxim Specific”>
Lockable:
<yes/no>
Command Code:
<hex value>
Format:
<data format>
Data Bytes:
<byte count>
Units:
<unit of measure>
Transfer:
<SMBus transaction>
Factory Value:
<Maxim setting>
Description/Notes:
<Command definition if Maxim-specific, or notes on command functionality where it differs from the
PMBus specification.>
Part Number Differences
The MAX15301 controller is available under different part numbers with some functional differences as follows.
MAX15301AA01
The MAX15301AA01 has the first production firmware, version 4018.
MAX15301AA02
The MA15301AA02 has improved firmware, version 4328, with the following improvements:
• Changed to 2-point thermal measurement algorithm to improve the READ_TEMPERATURE_2 accuracy
• Added support for v6 final test/trim scheme (improves READ_TEMPERATURE_1 accuracy)
• Changed IC_DEVICE_ID length from 8 to 12 bytes
• PMBUS_REVISION changed to 0x22
• Changed EXT_TEMP_CAL defaults to improve READ_TEMPERATURE_2 accuracy
• Added SMBus timeout support
• Bug fix for interrupted PMBus read operations
• Bug fix for operation with FREQUENCY_SWITCH <400kHz and temperature sense diode connected to TEMPX