Datasheet

6-Channel Intelligent Fan Controller
MAX31785
32
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.
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.
STATUS_VOUT (7Ah)
The STATUS_VOUT command returns 1 byte of information with contents as described in Table 18.
Table 16. STATUS_BYTE
Table 17. STATUS_WORD
Table 18. STATUS_VOUT
BIT BIT NAME MEANING
7:6 0 These bits always return a 0.
5 VOUT_OV An overvoltage fault has occurred.
4:3 0 These bits always return 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 has occurred.
14:13 0 These bits always return a 0.
12 MFR A bit in STATUS_MFR_SPECIFIC has been set.
11 0 This bit always returns a 0.
10 FANS A fan fault or warning has occurred.
9:6 0 These bits always return a 0.
5 VOUT_OV An overvoltage fault has occurred.
4:3 0 These bits always return 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
7 VOUT_OV_FAULT VOUT overvoltage fault.
6 VOUT_OV_WARN VOUT overvoltage warning.
5 VOUT_UV_WARN VOUT undervoltage warning.
4 VOUT_UV_FAULT VOUT undervoltage fault.
3:0 0 These bits always return a 0.