Datasheet

LM5066

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SNVS655G –JUNE 2011–REVISED FEBRUARY 2013

STATUS_BYTE (78h)

The STATUS BYTE is a standard PMBus command that returns the value of a number of flags indicating the

state of the LM5066. Accesses to this command should use the PMBus read byte protocol. To clear bits in this

Table 9. STATUS_BYTE Definitions

Bit NAME Meaning Default

7 BUSY Not Supported, always 0 0

6 OFF This bit is asserted if the MOSFET is not switched on 1

for any reason.

5 VOUT OV Not Supported, always 0 0

4 IOUT OC Not Supported, always 0 0

3 VIN UV Fault A VIN Under-voltage Fault has occurred 1

2 TEMPERATURE A Temperature Fault or Warning has occurred 0

1 CML A Communication Fault has occurred 0

0 None of the Above A fault or warning not listed in bits [7:1] has occurred 1

STATUS_WORD (79h)

The STATUS_WORD command is a standard PMBus command that returns the value of a number of flags

indicating the state of the LM5066. Accesses to this command should use the PMBus read word protocol. To

clear bits in this register, the underlying fault should be removed and a CLEAR _FAULTS command issued. The

INPUT and VIN UV flags will default to 1 on startup, however, they will be cleared to 0 after the first time the

input voltage exceeds the resistor-programmed UVLO threshold.

Table 10. STATUS_WORD Definitions

Bit NAME Meaning Default

15 VOUT An output voltage fault or warning has occurred 0

14 IOUT/POUT Not Supported, always 0 0

13 INPUT An input voltage or current fault has occurred 1

12 MFR A Manufacturer Specific Fault or Warning has occurred 1

11 POWER GOOD The Power Good signal has been negated 1

10 FANS Not Supported, always 0 0

9 OTHER Not Supported, always 0 0

8 UNKNOWN Not Supported, always 0 0

7 BUSY Not Supported, always 0 0

6 OFF This bit is asserted if the MOSFET is not switched on for 1

any reason.

5 VOUT OV Not Supported, always 0 0

4 IOUT OC Not Supported, always 0 0

3 VIN UV A VIN Under-voltage Fault has occurred 1

2 TEMPERATURE A Temperature Fault or Warning has occurred 0

1 CML A Communication Fault has occurred 0

0 None of the Above A fault or warning not listed in bits [7:1] has occurred 1

Product Folder Links: LM5066