Datasheet

6-Channel Intelligent Fan Controller
MAX31785
33
STATUS_CML (7Eh)
The STATUS_CML command returns 1 byte of information with contents as described in Table 19.
STATUS_MFR_SPECIFIC (80h)
The STATUS_MFR_SPECIFIC command returns 1 byte of information with a summary of the reason for a fault. The
STATUS_MFR_SPECIFIC message content is described in Table 20.
STATUS_FANS_1_2 (81h)
The STATUS_FANS_1_2 command returns 1 byte of information with the status of the fan. The STATUS_FANS_1_2
command is described in Table 21.
Table 19. STATUS_CML
Table 20. STATUS_MFR_SPECIFIC
Note: The settings of the RED, ORANGE, YELLOW, and GREEN bits does not assert the ALERT signal.
Table 21. STATUS_FANS_1_2
BIT BIT NAME MEANING
7 COMM_FAULT An invalid or unsupported command has been received.
6 DATA_FAULT An invalid or unsupported data has been received.
5:1 0 These bits always return a 0.
0 FAULT_LOG_FULL MFR_NV_FAULT_LOG is full and needs to be cleared.
BIT BIT NAME MEANING
7 0 This bit always returns a 0.
6 OT_WARN Overtemperature warning.
5 OT_FAULT Overtemperature fault.
4 WATCHDOG A watchdog reset has occurred.
3:0 0 These bits always return a 0.
BIT BIT NAME MEANING
7 FAN_1_FAULT Fan 1 fault.
6 0 This bit always returns a 0.
5 FAN_1_WARN Fan 1 warning.
4 0 This bit always returns a 0.
3 RED
The lower nibble reports the estimated health of the fan. Only one of the four bits is set at any
one time. If no bits are set, the fan health cannot be estimated. RED is the worst health state
and GREEN is the best health state. The CLEAR_FAULTS command does not affect these
bits.
2 ORANGE
1 YELLOW
0 GREEN