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ADT7473
Table 78. THERM LIMIT REGISTERS (Note 1)
Register Address
0x6A
0x6B
0x6C
R/W (Note 2)
R/W
R/W
R/W
Remote 1 THERM Limit
Local THERM Limit
Remote 2 THERM Limit
Description
Power-On Default
0xA4 (100 ? C)
0xA4 (100 ? C)
ADT7473: 0xA4 (100 ? C)
ADT7473 ? 1: 0xC8 (136 ? 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 overtemperature. It also ensures some level of cooling in the event that s oftware
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, then 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 Lock bit is set to 1. Any further attempts to write to these registers have
no effect.
Table 79. TEMPERATURE/T MIN HYSTERESIS REGISTERS (Note 1)
Register Address
0x6D
Bit Name
R/W (Note 2)
R/W
Description
Remote 1 and local temperature hysteresis.
Power-On Default
0x44
HYSL
<3:0>
HYSR1
<7:4>
Local temperature hysteresis. 0 ? C to 15 ? C of
hysteresis can be applied to the local temperature
AFC and dynamic T MIN control loops.
Remote 1 temperature hysteresis. 0 ? C to 15 ? C of
hysteresis can be applied to the Remote 1
temperature AFC and dynamic T MIN control loops.
0x6E
HYSR2
<7:4>
R/W
Remote 2 temperature hysteresis.
Local temperature hysteresis. 0 ? C to 15 ? C of
hysteresis can be applied to the local temperature
AFC and dynamic T MIN control loops.
0x40
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.
Table 80. XNOR TREE TEST REGISTER
Register Address
0x6F
Bit Name
R/W (Note 1)
R/W
Description
XNOR tree test enable register.
Power-On Default
0x00
XEN <0>
Res <7:1>
If the XEN bit is set to 1, the device enters the XNOR
tree test mode. Clearing the bit removes the device
from the XNOR tree test mode.
Unused. Do not write to these bits.
1. 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.
Table 81. REMOTE 1 TEMPERATURE OFFSET REGISTER (0X70)
Register Address
<7:0>
R/W (Note 1)
R/W
Description
Allows a twos complement offset value to be automatically added to
or subtracted from the Remote 1 temperature reading. This is to
compensate for any inherent system offsets such as PCB trace
resistance. LSB value = 0.5 ? C.
Power-On Default
0x00
1. This register becomes read-only when the Configuration Register 1 Lock bit is set to 1. Any further attempts to write to this register have
no effect.
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