Datasheet

LM25066I, LM25066IA
www.ti.com SNVS824C –JUNE 2012–REVISED MARCH 2013
Table 8. VIN_UV_WARN_LIMIT Register
Value Meaning Default
1h – 0FFFh VIN Under-voltage Warning detection 0000h (disabled)
threshold
0000h VIN Under-voltage Warning disabled n/a
IIN_OC_WARN_LIMIT (5Dh)
The IIN_OC_WARN_LIMIT command is a standard PMBus command that allows configuring or reading the
threshold for the input current, over current warning. For access to this command use the PMBus Read or Write
word protocol. The coefficients show in table 43. To read data use the SMBus Read Word protocol. To write data
use the SMBus Write Word protocol. Sets the input current threshold above which a warning will be generated.
(Mirror at D3h)
STATUS_BYTE (78h)
The STATUS_BYTE command is a standard PMBus
™
command that returns the value of a number of flags
indicating the state of the LM25066I/A. Accesses to this command should use the PMBus
™
read byte protocol.
To clear bits in this register, the underlying fault should be removed and a CLEAR_FAULTS command issued.
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 for any reason. 0
5 VOUT OV Not Supported, always 0 0
4 IOUT OC OC Fault or OP Fault 0
3 VIN UV FAULT A VIN Under-voltage Fault has occurred 0
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 LM25066I/A. 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 FAULT 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 0
12 FET Fail FET Fail 0
11 POWER GOOD The Power Good signal has been negated 1
10 FANS Not Supported, always 0 0
9 CB Fault Circuit Breaker Fault has occurred 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 any reason. 0
5 VOUT OV Not Supported, always 0 0
4 IOUT OC/OP IIN overcurrent fault or FET dissapation fault 0
3 VIN UV FAULT A VIN Under-voltage Fault has occurred 0
2 TEMPERATURE A Temperature Fault or Warning has occurred 0
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