lm25066apsqx National Semiconductor Corporation, lm25066apsqx Datasheet - Page 35

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

MFR_SPECIFIC_01: MFR_READ_IIN
The MFR READ IIN command will report the 12-bit ADC mea-
sured current sense voltage. To read data from the
MFR_READ_IIN command, use the PMBus™ Read Word
protocol. Reading this register should use the coefficients
shown in the Telemetry and Warning Conversion Coefficients
Table. Please see the section on coefficient calculations to
calculate the values to use.
MFR_SPECIFIC_02: MFR_READ_PIN
The MFR READ PIN command will report the upper 12-bits
of the VIN x IIN product as measured by the 12-bit ADC. To
read data from the MFR READ PIN command, use the PM-
Bus™ Read Word protocol. Reading this register should use
the coefficients shown in the Telemetry and Warning Con-
version Coefficients Table. Please see the section on coeffi-
cient calculations to calculate the values to use.
MFR_SPECIFIC_03: MFR_IN_OC_WARN_LIMIT
The MFR IIN OVER CURRENT WARN LIMIT PMBus com-
mand sets the input overcurrent warning threshold. In the
event that the input current rises above the value set in this
register, the IIN Overcurrent flags are set in the status regis-
ters and the SMBALERT is asserted. To access the MFR IIN
OVERCURRENT WARN LIMIT register, use the PMBus™
Read/Write Word protocol. Reading/writing to this register
should use the coefficients shown in the Telemetry and Warn-
ing Conversion Coefficients Table.
MFR_SPECIFIC_04: MFR_PIN_OP_WARN_LIMIT
The MFR IIN OVER POWER WARN LIMIT PMBus command
sets the input overpower warning threshold. In the event that
the input power rises above the value set in this register, the
PIN Overpower flags are set in the status registers and the
SMBALERT is asserted. To access the MFR PIN OVER-
POWER WARN LIMIT register, use the PMBus™ Read/Write
Word protocol. Reading/writing to this register should use the
coefficients shown in the Telemetry and Warning Conversion
Coefficients Table.
Value
0h – 0FFFh
Value
0h – 0FFFh
Value
0h – 0FFEh
0FFFh
TABLE 25. MFR IIN OVERCURRENT WARN LIMIT
TABLE 24. MFR READ PIN Register
TABLE 23. MFR READ IIN Register
Meaning
Measured value
for input current
sense voltage
Meaning
Value for input
current x input
voltage
Meaning
Value for input
over current warn
limit
Input over current
warning disabled
Register
Default
0000h
Default
0000h
Default
0FFFh
n/a
35
MFR_SPECIFIC_05: READ_PIN_PEAK
The READ PIN PEAK command will report the maximum in-
put power measured since a Power On reset or the last
CLEAR PIN PEAK command. To access the READ PIN
PEAK command, use the PMBus™ Read Word protocol. Use
the coefficients shown in the Telemetry and Warning Coeffi-
cients Table.
MFR_SPECIFIC_06: CLEAR_PIN_PEAK
The CLEAR PIN PEAK command will clear the PIN PEAK
register. This command uses the PMBus™ Send Byte proto-
col.
MFR_SPECIFIC_07: GATE_MASK
The GATE MASK register allows the hardware to prevent fault
conditions from switching off the MOSFET. When the bit is
high, the corresponding FAULT has no control over the MOS-
FET gate. All status registers will still be updated (STATUS,
DIAGNOSTIC) and an SMBALERT will still be issued. This
register is accessed with the PMBus™ Read / Write Byte pro-
tocol.
Warning: Inhibiting the MOSFET switch off in response to overcur-
The IIN/PFET Fault refers to the input current fault and the
MOSFET power dissipation fault. There is no input power fault
detection; only input power warning detection.
MFR_SPECIFIC_08: ALERT_MASK
The ALERT MASK is used to mask the SMBALERT when a
specific fault or warning has occurred. Each bit corresponds
to one of the 14 different analog and digital faults or warnings
that would normally result in an SMBALERT being set. When
the corresponding bit is high, that condition will not cause the
SMBALERT to be asserted. If that condition occurs, the reg-
isters where that condition is captured will still be updated
Value
0h – 0FFEh
0FFFh
Value
0h – 0FFEh
TABLE 28. MFR_SPECIFIC_07 GATE MASK Definitions
TABLE 26. PIN OVER POWER WARN LIMIT Register
Bit
7
6
5
4
3
2
1
0
rent or circuit breaker fault conditions will likely result in
the destruction of the MOSFET! This functionality should
be used with great care and supervision!
TABLE 27. Read PIN Peak Register
CIRCUITBREAKER_FA
OVERTEMP FAULT
Not used, always 0
Not used, always 0
Not used, always 0
Meaning
Value for input
over power warn
limit
Input over power
warning disabled
Meaning
Maximum Value
for input current x
input voltage since
reset or last clear
IIN/PFET FAULT
VIN UV FAULT
VIN OV FAULT
NAME
ULT
Default
0FFFh
n/a
Default
0h
Default
www.national.com
0
0
0
0
0
0
0
0