lm25066apsqx National Semiconductor Corporation, lm25066apsqx Datasheet - Page 31

• Manufacturer Part Number: lm25066apsqx
• Description: Lm25066a System Power Management And Protection Ic With Pmbus
• Manufacturer: National Semiconductor Corporation

VIN_OV_WARN_LIMIT
The VIN OVERVOLTAGE WARN LIMIT is a standard PM-
Bus ™ command that allows configuring or reading the thresh-
old for the VIN Overvoltage 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 and the
SMBALERT signal is set.
VIN_UV_WARN_LIMIT
The VIN UNDERVOLTAGE WARN LIMIT is a standard PM-
Bus ™ command that allows configuring or reading the thresh-
old for the VIN Undervoltage Warning detection. Reading and
Value
0h – 0FFEh
0FFFh
TABLE 7. VIN Overvoltage Warning Limit Register
Bit
7
6
5
4
3
2
1
0
Meaning
VIN Overvoltage
Warning detection
threshold
VIN Overvoltage
Warning disabled
None of the Above
TEMPERATURE
VOUT OV
IOUT OC
VIN UV
NAME
Busy
CML
OFF
Default
0FFFh (disabled)
n/a
TABLE 9. STATUS Byte Definitions
A fault or warning not listed in bits [7:1] has occurred
this bit is asserted if the MOSFET is not switched on
A Temperature Fault or Warning has occurred
31
A VIN Undervoltage Fault has occurred
A Communication Fault has occurred
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 falls below
the value in this register, VIN UV Warn flags are set and the
SMBALERT signal is set.
STATUS_BYTE
The STATUS BYTE is a standard PMBus ™ command that
returns the value of a number of flags indicating the state of
the LM25066A. Accesses to this command should use the
PMBus ™ read byte protocol. To clear bits in this register, the
underlying fault should be cleared and a CLEAR FAULTS
command issued.
Value
1h – 0FFFh
0000h
TABLE 8. VIN Undervoltage Warning Limit Register
Not Supported, always 0
Not Supported, always 0
Not Supported, always 0
for any reason.
Meaning
Meaning
VIN Undervoltage
Warning detection
threshold
VIN Undervoltage
Warning disabled
Default
0000h (disabled)
n/a
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Default
0
1
0
0
1
0
0
1