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ADT7490
Table 78. T MIN REGISTERS (Note 1)
Register Address
0x67
0x68
0x69
R/W (Note 2)
R/W
R/W
R/W
Description
Remote 1 Temperature T MIN
Local Temperature T MIN
Remote 2 Temperature T MIN
Power-On Default
0x5A (90 ? C)
0x5A (90 ? C)
0x5A (90 ? C)
1. These are the T MIN registers for each temperature channel. When the temperature measured exceeds T MIN , the appropriate fan runs at
minimum speed and increases with temperature according to T RANGE .
2. These registers become read-only when the Configuration Register 1 (0x40) Lock bit is set. Any further attempts to write to these registers
have no effect.
Table 79. THERM LIMIT REGISTERS (Note 1)
Register Address
0x6A
0x6B
0x6C
R/W (Note 2)
R/W
R/W
R/W
Description
Remote 1 THERM Temperature Limit
Local THERM Temperature Limit
Remote 2 THERM Temperature Limit
Power-On Default
0x64 (100 ? C)
0x64 (100 ? C)
0x64 (100 ? C)
1. If any temperature measured exceeds its THERM limit, all PWM outputs drive their fans at 100% duty cycle. This is a fail-safe mechanism
incorporated to cool the system in the event of a critical over temperature. It also ensures some level of cooling in the event that software
or hardware locks up. If set to 0x80, this feature is disabled. The PWM output remains at 100% until the temperature drops below
THERM limit ? hysteresis. If the THERM pin is programmed as an output, exceeding these limits by 0.25 ? C can cause the THERM pin to
assert low as an output.
2. These registers become read-only when the Configuration Register 1 (0x40) Lock bit is set to 1. Any further attempts to write to these
registers have no effect.
Table 80. TEMPERATURE/T MIN HYSTERESIS REGISTERS
Register Address
0x6D
0x6E
R/W (Note 1)
R/W
R/W
Description
Remote 1 and Local Temperature/T MIN Hysteresis
PECI and Remote 2 Temperature/T MIN Hysteresis
Power-On Default
0x44
0x44
1. These registers become read-only when the Configuration Register 1(0x40) Lock bit is set to 1. Any further attempts to write to these registers
have no effect.
Table 81. REGISTER 0x6D ? REMOTE 1 AND LOCAL TEMPERATURE/T MIN HYSTERESIS
(POWER-ON DEFAULT = 0x44)
Bit No.
R/W
(Note 1)
[3:0]
[7:4]
Mnemonic
HYSL
HYSR1
(Note 2)
R/W
R/W
Description
Local temperature hysteresis. 0 ? C to 15 ? C of hysteresis can be applied to the Local
temperature AFC control loops.
Remote 1 temperature hysteresis. 0 ? C to 15 ? C of hysteresis can be applied to the Remote 1
Temperature AFC control loops.
1. Each 4-bit value controls the amount of temperature hysteresis applied to a particular temperature channel. Once the temperature for that
channel falls below its T MIN value, the fan remains running at PWM MIN duty cycle until the temperature = T MIN ? hysteresis. Up to 15 ? C of
hysteresis can be assigned to any temperature channel. The hysteresis value chosen also applies to that temperature channel if its THERM
limit is exceeded. The PWM output being controlled goes to 100%, if the THERM limit is exceeded and remains at 100% until the temperature
drops below THERM ? hysteresis. For acoustic reasons, it is recommended that the hysteresis value not be programmed less than 4 ? C. Setting
the hysteresis value lower than 4 ? C causes the fan to switch on and off regularly when the temperature is close to T MIN .
2. These registers become read-only when the Configuration Register 1 Lock bit is set to 1. Any further attempts to write to these registers have
no effect.
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