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参数资料
| 型号： | LM25066PSQX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, QCC24 |
| 封装： | LLP-24 |
| 文件页数： | 28/48页 |
| 文件大小： | 1456K |
| 代理商： | LM25066PSQX |
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Manufacturer Specific PMBus
Commands
MFR_SPECIFIC_00: READ_VAUX (D0h)
The READ_VAUX command will report the 12-bit ADC mea-
sured auxiliary voltage. Voltages greater than or equal to
1.16V to ground will be reported at plus full scale (0FFFh).
Voltages less than or equal to 0V referenced to ground will be
reported as 0 (0000h). Coefficients for the VAUX value are
dependent on the value of the external divider (if used). To
read data from the READ_VAUX command, use the PM-
Bus Read Word protocol.
TABLE 22. READ_VAUX Register
Value
Meaning
Default
0h – 0FFFh
Measured value
for VAUX input
0000h
MFR_SPECIFIC_01: MFR_READ_IIN (D1h)
The MFR_READ_IIN command will report the 12-bit ADC
measured 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.
TABLE 23. MFR_READ_IIN Register
Value
Meaning
Default
0h – 0FFFh
Measured value
for input current
sense voltage
0000h
MFR_SPECIFIC_02: MFR_READ_PIN (D2h)
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.
TABLE 24. MFR_READ_PIN Register
Value
Meaning
Default
0h – 0FFFh
Value for input
current x input
voltage
0000h
MFR_SPECIFIC_03: MFR_IN_OC_WARN_LIMIT (D3h)
The MFR_IIN_OC_ WARN_LIMIT PMBus command sets
the input over-current warning threshold. In the event that the
input current rises above the value set in this register, the IIN
over-current flags are set in the status registers and the SM-
BA is asserted. To access the MFR_IIN_ OC_WARN_LIMIT
register, use the PMBus Read/Write Word protocol. Read-
ing/writing to this register should use the coefficients shown
in the Telemetry and Warning Conversion Coefficients Table.
TABLE 25. MFR_IIN_OC_WARN_LIMIT Register
Value
Meaning
Default
0h – 0FFEh
Value for input
over-current warn
limit
0FFFh
Input over-current
warning disabled
n/a
MFR_SPECIFIC_04: MFR_PIN_OP_WARN_LIMIT (D4h)
The MFR_PIN_OP_WARN_LIMIT PMBus command sets
the input over-power warning threshold. In the event that the
input power rises above the value set in this register, the PIN
Over-power flags are set in the status registers and the SM-
BA is asserted. To access the MFR_PIN_OP_WARN_LIMIT
register, use the PMBus Read/Write Word protocol. Read-
ing/writing to this register should use the coefficients shown
in the Telemetry and Warning Conversion Coefficients Table.
TABLE 26. MFR_PIN_OP_WARN_LIMIT Register
Value
Meaning
Default
0h – 0FFEh
Value for input
over-power warn
limit
0FFFh
Input over-power
warning disabled
n/a
MFR_SPECIFIC_05: READ_PIN_PEAK (D5h)
The READ_PIN_PEAK command will report the maximum
input 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 Coefficients Table.
TABLE 27. READ_PIN_PEAK Register
Value
Meaning
Default
0h – 0FFEh
Maximum value for
input current x
input voltage since
reset or last clear
0h
MFR_SPECIFIC_06: CLEAR_PIN_PEAK (D6h)
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 (D7h)
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
MOSFET gate. All status registers will still be updated (STA-
TUS, DIAGNOSTIC) and an SMBA 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 over-cur-
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!
www.national.com
34
LM25066
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