lm25066apsqx National Semiconductor Corporation, lm25066apsqx Datasheet - Page 38

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

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MFR_SPECIFIC_17: READ_DIAGNOSTIC_WORD
The READ DIAGNOSTIC WORD PMBus command will re-
port all of the LM25066A faults and warnings in a single read
operation. The standard response to the assertion of the SM-
BALERT signal of issuing multiple read requests to various
status registers can be replaced by a single word read to the
MFR_SPECIFIC_18: AVG_BLOCK_READ
The AVG_BLOCK_READ command concatenates the
DIAGNOSTIC_WORD with input and output average teleme-
try information (IIN, VOUT, VIN, PIN) as well as TEMPERA-
TURE to capture all of the operating information of the part in
a single PMBus™ transaction. The block is 12 bytes long with
telemetry information being sent out in the same manner as
if an individual READ_AVG_XXX command had been issued
(shown below). AVG_BLOCK_READ also guarantees that
the VIN, VOUT, and IIN measurements are all time-aligned
whereas there is a chance they may not be if read with indi-
vidual PMBus™ commands. To read data from the
AVG_BLOCK_READ command, use the SMBus Block Read
protocol.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
TABLE 38. DIAGNOSTIC_WORD Format
VOUT_UNDERVOLTAGE_WARN
OVER_TEMPERATURE_FAULT
OVER_TEMPERATURE_WARN
VIN_UNDERVOLTAGE_FAULT
VIN_UNDERVOLTAGE_WARN
VIN_CURRENT/PFET_FAULT
VIN_OVERVOLTAGE_WARN
VIN_OVERVOLTAGE_FAULT
CIRCUIT_BREAKER_FAULT
EXT_MOSFET_SHORTED
TIMER_LATCHED_OFF
CONFIG_PRESET
IIN_OP_WARN
PGOOD_BAR
DEVICE_OFF
CML_FAULT
Meaning
38
DIAGNOSTIC WORD register. The READ DIAGNOSTIC
WORD command should be read with the PMBus™ Read
Word protocol. The DIAGNOSTIC WORD is also returned in
the BLOCK READ, BLACK BOX READ, and AVG BLOCK
READ operations.
TEMPERATURE
DIAGNOSTIC
AVG_VOUT
TABLE 39. AVG_BLOCK_READ Register Format
(always 12)
Byte Count
AVG_VIN
AVG_PIN
AVG_IIN
WORD
(1 word)
(1 word)
(1 word)
(1 word)
(1 word)
(1 word)
(1 byte)
Default
0
0
0
0
1
0
0
0
1
1
1
0
0
0
0
0