LTC2978C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978C' PDF : 64 Pages View PDF
LTC2978
PMBus Command summary
Summary Table
COMMAND NAME
OT_FAULT_RESPONSE
OT_WARN_LIMIT
UT_WARN_LIMIT
UT_FAULT_LIMIT
UT_FAULT_RESPONSE
VIN_OV_FAULT_LIMIT
VIN_OV_FAULT_
RESPONSE
VIN_OV_WARN_LIMIT
VIN_UV_WARN_LIMIT
VIN_UV_FAULT_LIMIT
VIN_UV_FAULT_
RESPONSE
POWER_GOOD_ON
POWER_GOOD_OFF
TON_DELAY
TON_RISE
TON_MAX_FAULT_LIMIT
TON_MAX_FAULT_
RESPONSE
TOFF_DELAY
STATUS_BYTE
STATUS_WORD
STATUS_VOUT
CMD
CODE DESCRIPTION
0x50 Action to be taken by the device when an
overtemperature fault is detected.
0x51 Overtemperature warning limit.
DATA
TYPE PAGED FORMAT UNITS EEPROM
R/W Byte N
Reg
Y
R/W Word N
L11
°C
Y
0x52 Undertemperature warning limit.
R/W Word N
L11
°C
Y
0x53 Undertemperature fault limit.
R/W Word N
L11
°C
Y
0x54 Action to be taken by the device when an R/W Byte N
Reg
Y
undertemperature fault is detected.
0x55 Input overvoltage fault limit measured at R/W Word N
L11
V
Y
VIN_SNS pin.
0x56 Action to be taken by the device when an R/W Byte N
Reg
Y
input overvoltage fault is detected.
0x57 Input overvoltage warning limit measured R/W Word N
L11
V
Y
at VIN_SNS pin.
0x58 Input undervoltage warning limit
measured at VIN_SNS pin.
R/W Word N
L11
V
Y
0x59 Input undervoltage fault limit measured at R/W Word N
L11
V
Y
VIN_SNS pin.
0x5A Action to be taken by the device when an R/W Byte N
Reg
Y
input undervoltage fault is detected.
0x5E Output voltage at or above which a power R/W Word Y
L16
V
Y
good should be asserted.
0x5F Output voltage at or below which a power R/W Word Y
L16
V
Y
good should be deasserted.
0x60 Time from CONTROL pin and/or
R/W Word Y
L11 ms
Y
OPERATION command = ON to VOUT_EN
pin = ON.
0x61 Time from when the VOUT_ENn pin goes R/W Word Y
L11 ms
Y
high until the LTC2978 optionally soft-
connects its DAC and begins to servo the
output voltage to the desired value.
0x62 Maximum time from VOUT_EN = ON
R/W Word Y
L11 ms
Y
assertion that an UV condition will be
tolerated before a TON_MAX_FAULT
condition results.
0x63 Action to be taken by the device when a R/W Byte Y
Reg
Y
TON_MAX_FAULT event is detected.
0x64 Time from CONTROL pin and/or
R/W Word Y
L11 ms
Y
OPERATION command = OFF to VOUT_EN
pin = OFF.
0x78 One byte summary of the unit’s fault
R Byte
Y
Reg
condition.
0x79 Two byte summary of the unit’s fault
R Word Y
Reg
condition.
0x7A Output voltage fault and warning status. R Byte
Y
Reg
DEFAULT
VALUE
FLOAT
HEX
0xB8
75.0
0xEA58
0
0x8000
–5.0
0xCD80
0xB8
15.0
0xD3C0
0x80
14.0
0xD380
0
0x8000
0
0x8000
0x00
0.96
0x1EB8
0.94
0x1E14
1.0
0xBA00
10.0
0xD280
15.0
0xD3C0
0xB8
1.0
0xBA00
NA
NA
NA
REF
PAGE
36
34
34
34
36
33
36
33
33
33
36
33
33
34
34
34
36
34
37
38
38
For more information www.linear.com/LTC2978
2978fd
25
Share Link: 
