Texas Instruments Evaluation Board for the LM25066I LM25066I-EVM/NOPB LM25066I-EVM/NOPB 데이터 시트
제품 코드
LM25066I-EVM/NOPB
SNVS824C – JUNE 2012 – REVISED MARCH 2013
Table 1. Supported PMBus
™
Commands (continued)
Number
Default
Code
Name
Function
R/W
Of Data
Value
Bytes
E0h
MFR_SPECIFIC_16
Captures diagnostic and telemetry information which are
R
12
0000h
BLACK_BOX_READ
latched when the first SMBA alert occurs after faults have been
0000h
cleared.
0000h
0000h
0000h
0000h
0000h
0000h
0000h
E1h
MFR_SPECIFIC_17
Manufacturer-specific parallel of the STATUS_WORD to convey
R
2
0880h
READ_DIAGNOSTIC_WORD
all FAULT/WARN data in a single transaction.
E2h
MFR_SPECIFIC_18
Retrieves most recent average telemetry and diagnostic
R
12
0880h
AVG_BLOCK_READ
information in a single transaction.
0000h
0000h
0000h
0000h
0000h
0000h
0000h
0000h
0000h
Standard PMBus™ Commands
OPERATION (01h)
The OPERATION command is a standard PMBus
™
command that controls the MOSFET switch. This command
may be used to switch the MOSFET ON and OFF under host control. 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 command after a fault triggered shutdown will not clear the fault registers. The OPERATION
command is issued with the write byte protocol.
after a fault triggered shutdown. Writing an OFF command followed by an ON command will clear all faults.
Writing only an ON command 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. Issuing a CLEAR_FAULTS command will
not cause the MOSFET 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
the SMBA signal may not clear or will re-assert almost immediately. Issuing a CLEAR_FAULTS command will
not cause the MOSFET 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
™
command that returns information about the PMBus
™
functions supported by the LM25066I/A. 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 PMBus
™
command that allows configuring or reading the
threshold for the VOUT Under-voltage Warning detection. Reading and writing to this register should use the
coefficients shown in
coefficients shown in
. Accesses to this command should use the PMBus
™
read or write word protocol.
If the measured value of VOUT falls below the value in this register, VOUT UV Warn Limit flags are set in the
respective registers, and the SMBA signal is asserted.
respective registers, and the SMBA signal is asserted.
Copyright © 2012–2013, Texas Instruments Incorporated
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