Analog Devices LT7170 Reference Manual page 6

Reference Manual
PMBUS COMMAND SUMMARY
Table 1. Supported PMBus and MFR Commands
2
Command Name
FREQUENCY_SWITCH
VIN_ON
VIN_OFF
IOUT_CAL_OFFSET
VOUT_OV_FAULT_LIMIT
VOUT_OV_FAULT_RESPONSE
VOUT_OV_WARN_LIMIT
VOUT_UV_WARN_LIMIT
VOUT_UV_FAULT_LIMIT
VOUT_UV_FAULT_RESPONSE
IOUT_OC_FAULT_RESPONSE
IOUT_OC_WARN_LIMIT
OT_FAULT_LIMIT
OT_FAULT_RESPONSE
OT_WARN_LIMIT
VIN_OV_FAULT_RESPONSE
VIN_UV_WARN_LIMIT
TON_DELAY
TON_RISE
TON_MAX_FAULT_LIMIT
TON_MAX_FAULT_RESPONSE
TOFF_DELAY
TOFF_FALL
TOFF_MAX_WARN_LIMIT
STATUS_BYTE
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1
(Continued)
Command
Code Description
0x33 Switching frequency of the regulator.
0x35 Input voltage at which the unit must start power
conversion.
0x36 Input voltage at which the unit must stop power
conversion.
0x39 Offset for READ_IOUT.
0x40 Output overvoltage (OV) fault limit.
0x41 Action to be taken by the device when an output
overvoltage fault is detected.
0x42 Output overvoltage warning limit.
0x43 Output undervoltage (UV) warning limit.
0x44 Output undervoltage fault limit.
0x45 Action to be taken by the device when an output
undervoltage fault is detected.
0x47 Action to be taken by the device when an output
overcurrent fault is detected.
0x4A Output overcurrent warning limit.
0x4F Internal overtemperature fault limit.
0x50 Action to be taken by the device when an internal
overtemperature fault is detected.
0x51 Internal overtemperature warning limit.
0x56 Action to be taken by the device when an input
overvoltage fault is detected.
0x58 Input supply undervoltage warning limit.
0x60 Time from RUN and/or OPERATION on to output rail
turn-on.
0x61 Time from when the output starts to rise until the
output voltage reaches the V
0x62 Maximum time from the start of TON_RISE for V
cross the VOUT_UV_FAULT_LIMIT.
0x63 Action to be taken by the device when a TON_
MAX_FAULT event is detected.
0x64 Time from RUN and/or OPERATION off to the start of
TOFF_FALL ramp.
0x65 Time from when the output starts to fall until the output
reaches zero volts.
0x66 Maximum allowed time, after TOFF_FALL
completed, for the unit to decay below
MFR_DISCHARGE_THRESHOLD.
0x78 One byte summary of the unit fault condition.
Type
R/W
word
R/W
Word
R/W
word
R/W
word
R/W
word
R/W
byte
R/W
word
R/W
word
R/W
word
R/W
byte
R/W
byte
R/W
word
R/W
word
R/W
byte
R/W
word
R/W
byte
R/W
word
R/W
word
R/W
commanded value. word
OUT
to R/W
OUT
word
R/W
byte
R/W
word
R/W
word
R/W
word
R/W
byte
LT7170/LT7170-1
Data
3
Format Unit NVM Default Value
IEEE kHz Yes 1000.0, 0x63D0
1.4, 0x3D9A
IEEE V Yes
IEEE V Yes 1.35, 0x3D66
IEEE A Yes 0.1, 0x2E66
IEEE V Yes 0.55, 0x3866
Register 0xB8
Yes
IEEE V Yes 0.537, 0x384C
V Yes 0.467, 0x3779
IEEE
IEEE V Yes 0.465, 0x3770
Register Yes 0x00
Register Yes 0x00
IEEE A Yes 20.0, 0x4D00
IEEE °C Yes 160.0, 0x5900
Register Yes 0xC0
IEEE °C Yes 140.0, 0x5860
Register Yes 0xB8
IEEE V Yes −1.0, 0xBC00
IEEE ms Yes 0.0, 0x0000
IEEE ms Yes 1.0, 0x3C00
IEEE ms Yes 5.0, 0x4500
Register Yes 0x00
IEEE ms Yes 0.0, 0x0000
IEEE ms Yes 2.0, 0x4000
IEEE ms Yes 0.0, 0x0000
Register No
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