Datasheet

LTC2978A
25
2978afa
For more information www.linear.com/LTC2978A
Summary Table
COMMAND NAME
CMD
CODE DESCRIPTION TYPE PAGED
D
ATA
FORMAT UNITS EEPROM
DEFAULT
VALUE
FLOAT
HEX
REF
PAGE
PAGE 0x00 Channel or page currently selected for any
command that supports paging.
R/W Byte N Reg 0x00 30
OPERATION 0x01 Operating mode control. On/Off, Margin
High and Margin Low.
R/W Byte Y Reg Y 0x00 31
ON_OFF_CONFIG 0x02 CONTROL pin & PMBus bus on/off
command setting.
R/W Byte Y Reg Y 0x12 32
CLEAR_FAULTS 0x03 Clear any fault bits that have been set. Send Byte Y NA 32
WRITE_PROTECT 0x10 Level of protection provided by the device
against accidental changes.
R/W Byte N Reg Y 0x00 33
STORE_USER_ALL 0x15 Store entire operating memory to
EEPROM.
Send Byte N NA 33
RESTORE_USER_ALL 0x16 Restore entire operating memory from
EEPROM.
Send Byte N NA 33
CAPABILITY 0x19 Summary of PMBus optional
communication protocols supported by
this device.
R Byte N Reg 0xE0 33
VOUT_MODE 0x20 Output voltage data format and mantissa
exponent. (2
–13
)
R Byte Y Reg 0x13 34
VOUT_COMMAND 0x21 Servo Target. Nominal DC/DC converter
output voltage setpoint.
R/W Word Y L16 V Y 1.0
0x2000
34
VOUT_MAX 0x24
Upper limit on the output voltage the unit
can command regardless of any other
commands.
R/W W
ord Y L16 V Y 4.0
0x8000
34
VOUT_MARGIN_HIGH 0x25 Margin high DC/DC converter output
voltage setting.
R/W Word Y L16 V Y 1.05
0x219A
34
VOUT_MARGIN_LOW 0x26
Margin low DC/DC converter output
voltage setting.
R/W Word Y L16 V Y 0.95
0x1E66
34
VIN_ON 0x35
Input voltage (V
IN_SNS
) above which
power conversion can be enabled.
R/W Word N L11 V Y 10.0
0xD280
34
VIN_OFF 0x36
Input voltage (V
IN_SNS
) below which
power conversion is disabled. All V
OUT_EN
pins go off immediately.
R/W Word N L11 V Y 9.0
0xD240
34
VOUT_OV_FAULT_LIMIT 0x40 Output overvoltage fault limit. R/W Word Y L16 V Y 1.1
0x2333
34
VOUT_OV_FAULT_RESPONSE
0x41 Action to be taken by the device when an
output overvoltage fault is detected.
R/W Byte Y Reg Y 0x80 36
VOUT_OV_WARN_LIMIT 0x42 Output overvoltage warning limit. R/W Word Y L16 V Y 1.075
0x2266
34
VOUT_UV_WARN_LIMIT
0x43 Output undervoltage warning limit. R/W Word Y L16 V Y 0.925
0x1D9A
34
VOUT_UV_FAULT_LIMIT
0x44 Output undervoltage fault limit. Limit
used to determine if TON_MAX_FAULT
has been met and the unit is on.
R/W W
ord Y L16 V Y 0.9
0x1CCD
34
VOUT_UV_FAULT_RESPONSE
0x45 Action to be taken by the device when an
output undervoltage fault is detected.
R/W Byte Y Reg Y 0x7F 36
OT_FAULT_LIMIT 0x4F Overtemperature fault limit. R/W Word N L11 °C Y 85.0
0xEAA8
35
PMBus COMMAND SUMMARY