lm5066pmhx National Semiconductor Corporation, lm5066pmhx Datasheet - Page 30

• Manufacturer Part Number: lm5066pmhx
• Description: High Voltage System Power Management And Protection Ic With Pmbus
• Manufacturer: National Semiconductor Corporation

www.national.com
The VIN_OV_WARN_LIMIT command is a standard PMBus
command that allows configuring or reading the threshold for
the VIN over-voltage warning detection. Reading and writing
to this register should use the coefficients shown in the
Telemetry and Warning Conversion Coefficients Table. Ac-
cesses to this command should use the PMBus read or write
word protocol. If the measured value of VIN rises above the
value in this register, VIN OV Warn flags are set in the re-
spective registers and the SMBA signal is asserted.
VIN_UV_WARN_LIMIT (58h)
The VIN_UV_WARN_LIMIT command is a standard PMBus
command that allows configuring or reading the threshold for
the VIN under-voltage warning detection. Reading and writing
STATUS_WORD (79h)
The STATUS_WORD command is a standard PMBus com-
mand that returns the value of a number of flags indicating the
state of the LM5066. Accesses to this command should use
the PMBus read word protocol. To clear bits in this register,
Value
0h – 0FFEh
0FFFh
Bit
Bit
15
14
13
12
11
10
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
TABLE 7. VIN_OV_WARN_LIMIT Register
Meaning
VIN Over-voltage
Warning detection
threshold
VIN Over-voltage
Warning disabled
None of the Above
POWER GOOD
TEMPERATURE
IOUT/POUT
UNKNOWN
VIN UV Fault
VOUT OV
IOUT OC
OTHER
VOUT OV
VIN UV
IOUT OC
NAME
INPUT
VOUT
FANS
BUSY
MFR
OFF
NAME
BUSY
CML
OFF
Default
0FFFh (disabled)
n/a
TABLE 10. STATUS_WORD Definitions
TABLE 9. STATUS_BYTE Definitions
A Manufacturer Specific Fault or Warning has occurred
This bit is asserted if the MOSFET is not switched on
A fault or warning not listed in bits [7:1] has occurred
This bit is asserted if the MOSFET is not switched
An output voltage fault or warning has occurred
An input voltage or current fault has occurred
A Temperature Fault or Warning has occurred
The Power Good signal has been negated
A VIN Under-voltage Fault has occurred
A VIN Under-voltage Fault has occurred
30
A Communication Fault has occurred
to this register should use the coefficients shown in the
Telemetry and Warning Conversion Coefficients Table. Ac-
cesses to this command should use the PMBus read or write
word protocol. If the measured value of VIN falls below the
value in this register, VIN UV Warn flags are set in the re-
spective register, and the SMBA signal is asserted.
STATUS_BYTE (78h)
The STATUS BYTE is a standard PMBus command that re-
turns the value of a number of flags indicating the state of the
LM5066. Accesses to this command should use the PMBus
read byte protocol. To clear bits in this register, the underlying
fault
CLEAR_FAULTS command issued.
the underlying fault should be removed and a CLEAR
_FAULTS command issued. The INPUT and VIN UV flags will
default to 1 on startup, however, they will be cleared to 0 after
the first time the input voltage exceeds the resistor-pro-
grammed UVLO threshold.
Value
1h – 0FFFh
0000h
Not Supported, always 0
Not Supported, always 0
Not Supported, always 0
Not Supported, always 0
Not Supported, always 0
Not Supported, always 0
Not Supported, always 0
Not Supported, always 0
Not Supported, always 0
Not Supported, always 0
on for any reason.
should
for any reason.
TABLE 8. VIN_UV_WARN_LIMIT Register
Meaning
Meaning
be
Meaning
VIN Under-voltage
Warning detection
threshold
VIN Under-voltage
Warning disabled
removed
on
the
Default
0000h (disabled)
n/a
system
Default
Default
0
1
0
0
1
0
0
1
0
0
1
1
1
0
0
0
0
1
0
0
1
and
a