LTC2978A View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC2978A
Linear Technology
'LTC2978A' PDF : 82 Pages View PDF
LTC2978A
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
DEFAULT
VALUE
DATA
FLOAT REF
TYPE PAGED FORMAT UNITS EEPROM HEX PAGE
0x00 Channel or page currently selected for any R/W Byte N
Reg
command that supports paging.
0x00 30
0x01 Operating mode control. On/Off, Margin R/W Byte Y
Reg
High and Margin Low.
Y
0x00 31
0x02 CONTROL pin & PMBus bus on/off
command setting.
R/W Byte Y
Reg
Y
0x12 32
0x03 Clear any fault bits that have been set. Send Byte Y
NA 32
0x10 Level of protection provided by the device R/W Byte N
Reg
against accidental changes.
Y
0x00 33
0x15 Store entire operating memory to
EEPROM.
Send Byte N
NA 33
0x16 Restore entire operating memory from
EEPROM.
Send Byte N
NA 33
0x19 Summary of PMBus optional
R Byte
N
Reg
communication protocols supported by
this device.
0xE0 33
0x20 Output voltage data format and mantissa R Byte
Y
Reg
exponent. (2–13)
0x13 34
0x21 Servo Target. Nominal DC/DC converter R/W Word Y
L16
V
output voltage setpoint.
Y
1.0 34
0x2000
0x24 Upper limit on the output voltage the unit R/W Word Y
L16
V
can command regardless of any other
commands.
Y
4.0 34
0x8000
0x25 Margin high DC/DC converter output
voltage setting.
R/W Word Y
L16
V
Y
1.05 34
0x219A
0x26 Margin low DC/DC converter output
voltage setting.
R/W Word Y
L16
V
Y
0.95 34
0x1E66
0x35 Input voltage (VIN_SNS) above which
power conversion can be enabled.
R/W Word N
L11
V
Y
10.0 34
0xD280
0x36 Input voltage (VIN_SNS) below which
R/W Word N
L11
V
power conversion is disabled. All VOUT_EN
pins go off immediately.
Y
9.0 34
0xD240
0x40 Output overvoltage fault limit.
R/W Word Y
L16
V
Y
1.1 34
0x2333
0x41 Action to be taken by the device when an R/W Byte Y
Reg
output overvoltage fault is detected.
Y
0x80 36
0x42 Output overvoltage warning limit.
R/W Word Y
L16
V
Y
1.075 34
0x2266
0x43 Output undervoltage warning limit.
R/W Word Y
L16
V
Y
0.925 34
0x1D9A
0x44 Output undervoltage fault limit. Limit
R/W Word Y
L16
V
used to determine if TON_MAX_FAULT
has been met and the unit is on.
Y
0.9 34
0x1CCD
0x45 Action to be taken by the device when an R/W Byte Y
Reg
output undervoltage fault is detected.
Y
0x7F 36
0x4F Overtemperature fault limit.
R/W Word N
L11 °C
Y
85.0 35
0xEAA8
2978af
For more information www.linear.com/LTC2978A
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