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Then, user must configure following registers
•
Configure USER_CONFIG(0xD1) to re-assign master and slaves
•
Configure INTERLEAVE (0x37) to rearrange interleave phases
•
Configure DDC_CONFIG(0xD3) and DDC_GROUP(0xE2) to assign different group number for
disconnected channels other than used channels. This will prevent unused channel to spread
fault signal.
•
Configure ON_OFF_CONFIG(0x02) to give different start up method for used and unused
channels. For example, configure used channels as PMBus startup and configure unused
channels as EN startup. This potentially will prevent unused channels to operate.
Consult local ABB FAEs for more details.
PMBUS COMMANDS
In this application note, only limited commands are included. All settings must be saved to user NVM
before power cycle, otherwise all changes will be lost. Refer to DPI-CLI User Guide for detailed
procedures.
PMBus Turn-on/Turn-off
•
Turn-on: write 0x80 to OPERATION (0x01) for slave devices first then master
•
Turn-off: write 0x00 to OPERATION (0x01) for master device
Switch between PMBus and EN control
•
write 0x16 to ON_OFF_CONFIG(0x02) for all devices (EN control)
•
write 0x1A to ON_OFF_CONFIG(0x02) for all devices (PMBus control)
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Channel Illustration
shunt
