Datasheet

LM5066
SNVS655G –JUNE 2011–REVISED FEBRUARY 2013 www.ti.com
MFR_SPECIFIC_08: ALERT_MASK (D8h)
The ALERT_MASK command is used to mask the SMBA when a specific fault or warning has occurred. Each bit
corresponds to one of the 14 different analog and digital faults or warnings that would normally result in an
SMBA being asserted. When the corresponding bit is high, that condition will not cause the SMBA to be
asserted. If that condition occurs, the registers where that condition is captured will still be updated (STATUS
registers, DIAGNOSTIC_WORD) and the external MOSFET gate control will still be active (VIN_OV_FAULT,
VIN_UV_FAULT, IIN/PFET_FAULT, CB_FAULT, OT_FAULT). This register is accessed with the PMBus Read /
Write Word protocol. The VIN UNDERVOLTAGE FAULT flag will default to 1 on startup, however, it will be
cleared to 0 after the first time the input voltage increases above the resistor-programmed UVLO threshold.
Table 29. ALERT_MASK Definitions
BIT NAME DEFAULT
15 VOUT UNDERVOLTAGE WARN 0
14 IIN LIMIT Warn 0
13 VIN UNDERVOLTAGE WARN 0
12 VIN OVERVOLTAGE WARN 0
11 POWER GOOD 1
10 OVERTEMP WARN 0
9 Not Used 0
8 OVERPOWER LIMIT WARN 0
7 Not Used 0
6 EXT_MOSFET_SHORTED 0
5 VIN UNDERVOLTAGE FAULT 1
4 VIN OVERVOLTAGE FAULT 0
3 IIN/PFET FAULT 0
2 OVERTEMPERATURE FAULT 0
1 CML FAULT (Communications Fault) 0
0 CIRCUIT BREAKER FAULT 0
MFR_SPECIFIC_09: DEVICE_SETUP (D9h)
The DEVICE_SETUP command may be used to override pin settings to define operation of the LM5066 under
host control. This command is accessed with the PMBus read / write byte protocol.
Table 30. DEVICE_SETUP Byte Format
Bit Name Meaning
7:5 Retry setting 111 = Unlimited retries
110 = Retry 16 times
101 = Retry 8 times
100 = Retry 4 times
011 = Retry 2 times
010 = Retry 1 time
001 = No retries
000 = Pin configured retries
4 Current limit setting 0 = High setting (50mV)
1 = Low setting (26mV)
3 CB/CL Ratio 0 = Low setting (1.9x)
1 = High setting (3.9x)
2 Current Limit Configuration 0 = Use pin settings
1 = Use SMBus settings
1 Unused
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