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
PAGE
OPERATION
ON_OFF_CONFIG
CLEAR_FAULTS
WRITE_PROTECT
STORE_USER_ALL
RESTORE_USER_ALL
CAPABILITY
VOUT_MODE
VOUT_COMMAND
VOUT_MAX
VOUT_MARGIN_HIGH
VOUT_MARGIN_LOW
VIN_ON
VIN_OFF
VOUT_OV_FAULT_LIMIT
VOUT_OV_FAULT_
RESPONSE
VOUT_OV_WARN_LIMIT
VOUT_UV_WARN_LIMIT
VOUT_UV_FAULT_LIMIT
VOUT_UV_FAULT_
RESPONSE
OT_FAULT_LIMIT
CMD
CODE DESCRIPTION
DATA
TYPE PAGED FORMAT UNITS EEPROM
0x00 Channel or page currently selected for any R/W Byte N
Reg
command that supports paging.
0x01 Operating mode control. On/Off, Margin R/W Byte Y
Reg
Y
High and Margin Low.
0x02 CONTROL pin & PMBus bus on/off
R/W Byte Y
Reg
Y
command setting.
0x03 Clear any fault bits that have been set. Send Byte Y
0x10 Level of protection provided by the device R/W Byte N
Reg
Y
against accidental changes.
0x15 Store entire operating memory to
Send Byte N
EEPROM.
0x16 Restore entire operating memory from Send Byte N
EEPROM.
0x19 Summary of PMBus optional
R Byte N
Reg
communication protocols supported by
this device.
0x20 Output voltage data format and mantissa R Byte
Y
Reg
exponent. (2–13)
0x21 Servo Target. Nominal DC/DC converter R/W Word Y
L16
V
Y
output voltage setpoint.
0x24 Upper limit on the output voltage the unit R/W Word Y
L16
V
Y
can command regardless of any other
commands.
0x25 Margin high DC/DC converter output
R/W Word Y
L16
V
Y
voltage setting.
0x26 Margin low DC/DC converter output
R/W Word Y
L16
V
Y
voltage setting.
0x35 Input voltage (VIN_SNS) above which
R/W Word N
L11
V
Y
power conversion can be enabled.
0x36 Input voltage (VIN_SNS) below which
R/W Word N
L11
V
Y
power conversion is disabled. All VOUT_EN
pins go off immediately.
0x40 Output overvoltage fault limit.
R/W Word Y
L16
V
Y
0x41 Action to be taken by the device when an R/W Byte Y
Reg
Y
output overvoltage fault is detected.
0x42 Output overvoltage warning limit.
R/W Word Y
L16
V
Y
0x43 Output undervoltage warning limit.
R/W Word Y
L16
V
Y
0x44 Output undervoltage fault limit. Limit used R/W Word Y
L16
V
Y
to determine if TON_MAX_FAULT has
been met and the unit is on.
0x45 Action to be taken by the device when an R/W Byte Y
Reg
Y
output undervoltage fault is detected.
0x4F Overtemperature fault limit.
R/W Word N
L11
°C
Y
DEFAULT
VALUE
FLOAT
HEX
0x00
0x00
0x12
NA
0x00
NA
NA
0xE0
0x13
1.0
0x2000
4.0
0x8000
1.05
0x219A
0.95
0x1E66
10.0
0xD280
9.0
0xD240
1.1
0x2333
0x80
1.075
0x2266
0.925
0x1D9A
0.9
0x1CCD
0x7F
85.0
0xEAA8
REF
PAGE
29
30
31
31
32
32
32
32
33
33
33
33
33
33
33
33
35
33
33
33
35
34
2978fd
24
For more information www.linear.com/LTC2978
Share Link: 
