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Remote-Junction Temperature-Controlled
Fan-Speed Regulator with SMBus Interface
Table 5. Configuration-Byte Bit Assignments
BIT
7(MSB)
6
5
NAME
ALERT Mask
Run/Stop
OVERT Polarity
POR
STATE
0
0
0
DESCRIPTION
When set to 1, ALERT is masked from internally generated errors.
When set to 1, the MAX6660 enters low-power standby.
0 provides active low, 1 provides active high.
When set to 1, Write Protect is in effect for the following applicable registers:
1. Configuration register bits 6, 5, 4, 3
4
Write Protect
0
2. T MAX register
3. T HYST register
4. Fan Conversion Rate register
When set to 1, the thermal loop is open. The Fan Speed Control retains the last
3
Thermal Closed/
Open Loop
0
closed-loop value unless overwritten by a bus command (in closed loop, the Fan
Speed Control is read only). If Fan Mode is set to Open Loop by writing a 1 to bit
0 of the Fan Gain register, then this bit is automatically set.
2
1
OVERT Input Inhibit
Mask OVERT
Output
0
0
When set to 1, an external signal on OVERT is masked from bit 1 of the Status
register.
Mask the OVERT output from an internally generated overtemperature error.
When 0, reading the Status register clears or sending an Alert Response Request
0
ALERT Clear Mode
0
clears ALERT (if the fault condition is no longer true). When set high, only an Alert
Response Request clears ALERT .
Table 6. Status-Byte Bit Assignments
BIT
NAME
POR
STATE
DESCRIPTION
When high, indicates that the fan driver transistor of the MAX6660 has
7 (MSB)
MAX6660 Overheat
0
overheated (temp > +150 ° C) and is in thermal shutdown. The fan driver remains
disabled until temperature falls below +140 ° C.
6
5
4
3
2
1
0
ALERT
Fan Driver Full
Scale
Remote High
Remote Low
Diode Open
OVERT
Fan Failure
0
0
0
0
0
0
0
When high, indicates ALERT has been activated (pulled low), regardless of
cause (internal or external).
When high, indicates the fan driver is at full scale. Only valid in fan
closed-loop mode (Register FG B170 = 0). Set to high in fan open-loop mode
(Register FG B170 = 1).
When high, the remote-junction temperature exceeds the temperature in the
Remote High register.
When high, the remote-junction temperature is lower than the temperature in the
Remote Low register.
When high, the remote-junction diode is open.
When high, indicates that OVERT has been activated, regardless of cause
(internal or external).
When high, indicates the count in the Fan Tachometer Count register is higher
than the limit set in the Fan Tachometer Count Limit register.
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