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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： | 22/48页 |
| 文件大小： | 1456K |
| 代理商： | LM25066PSQX |
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Standard PMBus Commands
OPERATION (01h)
The OPERATION command is a standard PMBus com-
mand that controls the MOSFET switch. This command may
be used to switch the MOSFET ON and OFF under host con-
trol. It is also used to re-enable the MOSFET after a fault
triggered shutdown. Writing an OFF command followed by an
ON command will clear all faults. Writing only an ON com-
mand after a fault triggered shutdown will not clear the fault
registers. The OPERATION command is issued with the write
byte protocol.
TABLE 2. Recognized OPERATION Command Values
Value
Meaning
Default
80h
Switch ON
80h
00h
Switch OFF
n/a
CLEAR_FAULTS (03h)
The CLEAR_FAULTS command is a standard PMBus
command that resets all stored warning and fault flags and
the SMBA signal. If a fault or warning condition still exists
when the CLEAR_FAULTS command is issued, the SMBA
signal may not clear or will re-assert almost immediately. Is-
suing a CLEAR_FAULTS command will not cause the MOS-
FET to switch back on in the event of a fault turn-off: that must
be done by issuing an OPERATION command after the fault
condition is cleared. This command uses the PMBus send
byte protocol.
CAPABILITY (19h)
The CAPABILITY command is a standard PMBus com-
mand that returns information about the PMBus functions
supported by the LM25066. This command is read with the
PMBus read byte protocol.
TABLE 3. CAPABILITY Register
Value Meaning
Default
B0h
Supports Packet Error Check, 400Kbits/
sec, Supports SMBus Alert
B0h
VOUT_UV_WARN_LIMIT (43h)
The VOUT_UV_WARN_LIMIT command is a standard PM-
Bus command that allows configuring or reading the thresh-
old for the VOUT Under-voltage Warning detection. Reading
and writing to this register should use the coefficients shown
in the Telemetry and Warning Conversion Coefficients Table.
Accesses to this command should use the PMBus read or
write word protocol. If the measured value of VOUT falls be-
low the value in this register, VOUT UV Warn Limit flags are
set in the respective registers, and the SMBA signal is as-
serted.
TABLE 4. VOUT_UV_WARN_LIMIT Register
Value
Meaning
Default
1h – 0FFFh
VOUT Under-
voltage Warning
detection
threshold
0000h (disabled)
0000h
VOUT Under-
voltage Warning
disabled
n/a
OT_FAULT_LIMIT (4Fh)
The OT_FAULT_LIMIT is a standard PMBus command that
allows configuring or reading the threshold for the Overtem-
perature Fault detection. Reading and writing to this register
should use the coefficients shown in the Telemetry and Warn-
ing Conversion Coefficients Table. Accesses to this com-
mand should use the PMBus read or write word protocol. If
the measured temperature exceeds this value, an overtem-
perature fault is triggered, the MOSFET is switched off, OT
Fault flags are set in the respective registers, and the SMBA
signal is asserted. After the measured temperature falls below
the value in this register, the MOSFET may be switched back
on with the OPERATION command. A single temperature
measurement is an average of 16 round-robin cycles. There-
fore, the minimum temperature fault detection time is 16 ms.
TABLE 5. OT_FAULT_LIMIT Register
Value
Meaning
Default
0h – 0FFEh
Overtemperature
Fault Threshold
Value
0960h (150°C)
0FFFh
Overtemperature
Fault detection
disabled
n/a
OT_WARN_LIMIT (51h)
The OT_WARN_LIMIT is a standard PMBus command that
allows configuring or reading the threshold for the Overtem-
perature Warning detection. Reading and writing to this reg-
ister should use the coefficients shown in the Telemetry and
Warning Conversion Coefficients Table. Accesses to this
command should use the PMBus read or write word proto-
col. If the measured temperature exceeds this value, an
overtemperature warning is triggered, the OT Warn flags are
set in the respective registers, and the SMBA signal is as-
serted. A single temperature measurement is an average of
16 round-robin cycles. Therefore, the minimum temperature
warn detection time is 16 ms.
TABLE 6. OT_WARN_LIMIT Register
Value
Meaning
Default
0h – 0FFEh
Overtemperature
Warn Threshold
Value
07D0h (125°C)
0FFFh
Overtemperature
Warn detection
disabled
n/a
VIN_OV_WARN_LIMIT (57h)
The VIN_OV_WARN_LIMIT is a standard PMBus com-
mand 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 Teleme-
try and Warning Conversion Coefficients Table. Accesses 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 respective
registers, and the SMBA signal is asserted.
29
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LM25066
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