GE Industrial Solutions QBDW025A0B Barracuda Series - Manual (Page 20)

GE
Data Sheet
QBDW025A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 20
Summary of Supported PMBus Commands
This document outlines the PMBus command support for the QBDW025 bus converter. Each supported command is outlined in
order of increasing command codes with a quick reference table of all supported commands included at the end of the document.
Each command will have the following basic information.
Command Name [Code]
Command support
Data format
Factory default
Additional information may be provided in tabular form or other format, if necessary.
OPERATION [0x01]
Command support: Supporting On/Off Immediate and Margins (Act on Fault). Soft off with sequencing not supported and Margins
(Ignore Fault) not supported. Therefore bits 6, 3, 2, 1 and 0 set as read only at factory defaults.
Format 8 bit unsigned (bit field)
Bit Position 7 6 5 4 3 2 1 0
Access r/w r r/w r/w r r r r
Function ON/OFF Bits[5:4] Bits[3:2] N/A
Default Value 1 0 0 0 1 0 0 0
ON_OFF_CONFIG [0x02]
Command support: Bit 1 polarity will be set based upon module code [0=Negative on/off logic, 1=positive on/off logic to allow
customer system to know hardware on/off logic
Format 8 bit unsigned (bit field)
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r/w r/w r r
Function (reserved) Bit 4 pu Bit 3 cmd Bit 2 cpr Bit 1 pol Bit 0 cpa
Default Value 0 0 0 1 1 1
module
code
1
CLEAR_FAULTS [0x03]
Command support: All functionality
STORE_DEFAULT_ALL[0x11]
Command support: All functionality – Stores operating parameters to EEprom memory.
Command requires ≤ 500ms to execute. Delay any additional commands to module for sufficient time to complete execution.
RESTORE_DEFAULT_ALL[0x12]
Command support: All functionality – Restores operating parameters from EEprom memory.
Command requires ≤ 200ms to execute. Delay any additional commands to module for sufficient time to complete execution.
VOUT_MODE[0x20]
Command support: Supported. Factory default: 0x14 – indicates linear mode with exp = -12
Format 8 bit unsigned (bit field)
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function
Mode (linear) 2’s complement exponent
Default Value 0 0 0 1 0 1 0 0
VOUT_COMMAND [0x21]
Data format: 16 bit unsigned mantissa (implied exponent per VOUT_MODE)
Factory default: 12.00V ( 12.00 / 2
-12 → 49,152 = 0xC000 )
Range limits (max/min): 13.2V/8.10V
Units: volt
Command support: Supported
VOUT_CAL_OFFSET [0x23]
Range limits (max/min): +0.25/-0.25
Units: volt
Command support: read/write support, lockout per MFR_DEVICE_TYPE, functionality implemented