Rainbow Electronics MAX34440 - Manual (Page 32)

PMBus 6-Channel Power-Supply Manager
MAX34440
32
Table 16. STATUS_BYTE
STATUS_BYTE (78h)
The STATUS_BYTE command returns 1 byte of information with a summary of the most critical faults. A value of 1 indi-
cates that a fault or warning event has occurred and a 0 indicates otherwise. Bits for unsupported features are reported
as 0. The STATUS_BYTE cannot be restored by the RESTORE_DEFAULT_ALL command. The STATUS_BYTE message
content is described in Table 16. This command is read-only.
Table 17. STATUS_WORD
STATUS_WORD (79h)
The STATUS_WORD command returns 2 bytes of information with a summary of the reason for a fault. The low byte of
the STATUS_WORD is the same data as the STATUS_BYTE. Table 17 describes the STATUS_WORD message content.
BIT BIT NAME MEANING
7:6 0 These bits always return a 0.
5 VOUT_OV An overvoltage fault has occurred.
4 IOUT_OC An overcurrent fault has occurred.
3 0 This bit always returns a 0.
2 TEMPERATURE A temperature fault or warning has occurred.
1 CML A communication, memory, or logic fault has occurred.
0 NONE OF THE ABOVE A fault or warning not listed in bits [7:1] has occurred.
BIT BIT NAME MEANING
15 VOUT An output voltage fault or warning or TON_MAX_FAULT has occurred.
14 IOUT An overcurrent fault or warning has occurred.
13 0 This bit always returns a 0.
12 MFR A bit in STATUS_MFR_SPECIFIC has been set.
11 POWER_GOOD# A power-supply voltage has fallen from POWER_GOOD_ON to less than POWER_GOOD_OFF.
10:6 0 These bits always return a 0.
5 VOUT_OV An overvoltage fault has occurred.
4 IOUT_OC An overcurrent fault has occurred.
3 0 This bit always returns a 0.
2 TEMPERATURE A temperature fault or warning has occurred.
1 CML A communication, memory, or logic fault has occurred.
0 NONE OF THE ABOVE A fault or warning not listed in bits [7:1] has occurred.