Datasheet

LTC2978A
26
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
OT_FAULT_RESPONSE 0x50 Action to be taken by the device when an
overtemperature fault is detected.
R/W Byte N Reg Y 0xB8 37
OT_WARN_LIMIT 0x51 Overtemperature warning limit. R/W Word N L11 °C Y 75.0
0xEA58
35
UT
_WARN_LIMIT 0x52
Undertemperature warning limit. R/W Word N L11 °C Y 0
0x8000
35
UT_FAULT_LIMIT 0x53
Undertemperature fault limit. R/W Word N L11 °C Y –5.0
0xCD80
35
UT_FAULT_RESPONSE
0x54 Action to be taken by the device when an
undertemperature fault is detected.
R/W Byte N Reg Y 0xB8 37
VIN_OV_FAULT_LIMIT 0x55 Input overvoltage fault limit measured at
V
IN_SNS
pin
R/W Word N L11 V Y 15.0
0xD3C0
34
VIN_OV_FAULT_RESPONSE 0x56 Action to be taken by the device when an
input overvoltage fault is detected.
R/W Byte N Reg Y 0x80 37
VIN_OV_WARN_LIMIT 0x57 Input overvoltage warning limit measured
at V
IN_SNS
pin
R/W Word N L11 V Y 14.0
0xD380
34
VIN_UV_WARN_LIMIT 0x58 Input undervoltage warning limit
measured at V
IN_SNS
pin.
R/W Word N L11 V Y 0
0x8000
34
VIN_UV_FAULT_LIMIT 0x59 Input undervoltage fault limit measured at
V
IN_SNS
pin
R/W Word N L11 V Y 0
0x8000
34
VIN_UV_FAULT_RESPONSE 0x5A Action to be taken by the device when an
input undervoltage fault is detected.
R/W Byte N Reg Y 0x00 37
POWER_GOOD_ON 0x5E Output voltage at or above which a power
good should be asserted.
R/W Word Y L16 V Y 0.96
0x1EB8
34
POWER_GOOD_OFF 0x5F
Output voltage at or below which a power
good should be deasserted.
R/W Word Y L16 V Y 0.94
0x1E14
34
TON_DELA
Y 0x60 Time from CONTROL pin and/or
OPERATION command = ON to V
OUT_EN
pin = ON.
R/W Word Y L11 ms Y 1.0
0xBA00
35
TON_RISE 0x61 Time from when the V
OUT_ENn
pin goes
high until the LTC2978A optionally soft-
connects its DAC and begins to servo the
output voltage to the desired value.
R/W Word Y L11 ms Y 10.0
0xD280
35
TON_MAX_FAULT_LIMIT
0x62 Maximum time from V
OUT_EN
= ON
assertion that an UV condition will be
tolerated before a TON_MAX_FAULT
condition results.
R/W Word Y L11 ms Y 15.0
0xD3C0
35
TON_MAX_FAULT_RESPONSE
0x63 Action to be taken by the device when a
TON_MAX_FAULT event is detected.
R/W Byte Y Reg Y 0xB8 37
TOFF_DELAY 0x64 Time from CONTROL pin and/or
OPERATION command = OFF to V
OUT_EN
pin = OFF.
R/W Word Y L11 ms Y 1.0
0xBA00
35
STATUS_BYTE 0x78 One byte summary of the unit’s fault
condition.
R Byte Y Reg NA 38
STATUS_WORD 0x79 Tw o byte summary of the unit’s fault
condition.
R Word Y Reg NA 39
STATUS_VOUT 0x7A Output voltage fault and warning status. R Byte Y Reg NA 39
PMBus COMMAND SUMMARY