LTC3882_15 Datasheet, PDF (25/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
OPERATION
STATUS_VOUT*
7 VOUT_OV Fault
6 VOUT_OV Warning
5 VOUT_UV Warning
4 VOUT_UV Fault
3 VOUT_MAX Warning
2 TON_MAX Fault
1 TOFF_MAX Warning
0 (reads 0)
(PAGED)
STATUS_IOUT
7 IOUT_OC Fault
6 (reads 0)
5 IOUT_OC Warning
4 (reads 0)
3 (reads 0)
2 (reads 0)
1 (reads 0)
0 (reads 0)
(PAGED)
STATUS_TEMPERATURE
7 OT Fault
6 OT Warning
5 (reads 0)
4 UT Fault
3 (reads 0)
2 (reads 0)
1 (reads 0)
0 (reads 0)
(PAGED)
STATUS_CML
7 Invalid/Unsupported Command
6 Invalid/Unsupported Data
5 Packet Error Check Failed
4 Memory Fault Detected
3 Processor Fault Detected
2 (reads 0)
1 Other Communication Fault
0 Other Memory or Logic Fault
STATUS_WORD
15 VOUT
14 IOUT
13 INPUT
12 MFR_SPECIFIC
11 POWER_GOOD#
10 (reads 0)
9 (reads 0)
8 (reads 0)
STATUS_BYTE
7 BUSY
6 OFF
5 VOUT_OV
4 IOUT_OC
3 (reads 0)
2 TEMPERATURE
1 CML
0 NONE OF THE ABOVE
(PAGED)
MFR_COMMON
7 Chip Not Driving ALERT Low
6 Chip Not Busy
5 Internal Calculations Not Pending
4 Output Not In Transition
3 EEPROM Initialized
2 (reads 0)
1 SHARE_CLK_LOW
0 WP Pin High
DESCRIPTION
MASKABLE GENERATES ALERT BIT CLEARABLE
General Fault or Warning Event Yes
Yes
Yes
General Non-Maskable Event
No
Yes
Yes
Dynamic
No
No
No
Status Derived from Other Bits
No
Not Directly
No
STATUS_INPUT
7 VIN_OV Fault
6 (reads 0)
5 VIN_UV Warning
4 (reads 0)
3 Unit Off for Insuffcient VIN
2 (reads 0)
1 (reads 0)
0 (reads 0)
STATUS_MFR_SPECIFIC
7 Internal Temperature Fault
6 Internal Temperature Warning
5 EEPROM CRC Error
4 Internal PLL Unlocked
3 Fault Log Present
2 (reads 0)
1 VOUT Short Cycled
0 GPIO Low
(PAGED)
MFR_PADS_LTC3882
15 Channel 1 is Slave
14 Channel 0 is Slave
13 (reads 0)
12 (reads 0)
11 Invalid ADC Result(s)
10 SYNC Output Disabled Externally
9 Channel 1 is POWER_GOOD
8 Channel 0 is POWER_GOOD
7 LTC3882 Forcing RUN1 Low
6 LTC3882 Forcing RUN0 Low
5 RUN1 Pin State
4 RUN0 Pin State
3 LTC3882 Forcing GPIO1 Low
2 LTC3882 Forcing GPIO0 Low
1 GPIO1 Pin State
0 GPIO0 Pin State
*IF THE CHANNEL IS CONFIGURED AS A SLAVE AS INDICATED BY MFR_PADS_LTC3882[15:14], VOUT_OV FAULT INDICATES A DETECTED MASTER ERROR
AMPLIFIER FAULT (COMP VOLTAGE TOO HIGH). NO OTHER BITS IN STATUS_VOUT ARE ACTIVE ON SLAVE CHANNELS
3882 F02
Figure 2. LTC3882 Status Register Summary
The BUSY bit in STATUS_BYTE also asserts ALERT low
and cannot be masked. This bit can be set as a result of
interaction between internal operation and PMBus com-
munication. This fault occurs when a command is received
that cannot be safely executed with one or both channels
enabled. As discussed in Application Information, BUSY
faults can be avoided by polling MFR_COMMON before
executing some commands.
Status information contained in MFR_COMMON and
MFR_PADS_LTC3882 can be used to clarify the contents
of STATUS_BYTE or STATUS_WORD as shown, but the
contents of these registers do not affect the state of the
ALERT pin and may not directly influence bits in STA-
TUS_BYTE or STATUS_WORD.
3882f
For more information www.linear.com/LTC3882
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