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REV. A
50
ADM1027
Table XX. PWM Minimum Duty Cycle Registers
Register Address
R/W
Description
Power-On Default
0x64
Read/Write
PWM1 Minimum Duty Cycle
0x80 (50% duty cycle)
0x65
Read/Write
PWM2 Minimum Duty Cycle
0x80 (50% duty cycle)
0x66
Read/Write
PWM3 Minimum Duty Cycle
0x80 (50% duty cycle)
Bit
Name
Read/Write
Description
<7:0>
PWM Duty
Read/Write
These bits define the PWM
MIN
 duty cycle for the PWMx output.
0x00 = 0% duty cycle (fan off)
0x40 = 25% duty cycle
0x80 = 50% duty cycle
0xFF = 100% duty cycle (fan full speed)
These registers become read-only when the ADM1027 is in automatic fan control mode.
Table XXI. T
MIN
 Registers
Register Address
R/W
Description
Power-On Default
0x67
Read/Write
Remote 1 Temperature T
MIN
0x5A (90
o
C)
0x68
Read/Write
Local Temperature T
MIN
0x5A (90
o
C)
0x69
Read/Write
Remote 2 Temperature T
MIN
0x5A (90
o
C)
These are the T
MIN
 registers for each temperature channel. When the temperature measured exceeds T
MIN
, the appropriate fan will
run at minimum speed and increase with temperature according to T
RANGE
.
These registers become read-only when the Configuration Register 1 lock bit is set. Any further attempts to write to these registers
will have no effect.
Table XXII. Therm Limit Registers
Register Address
R/W
Description
Power-On Default
0x6A
Read/Write
Remote 1 THERM Limit
0x64 (100
o
C)
0x6B
Read/Write
Local THERM Limit
0x64 (100
o
C)
0x6C
Read/Write
Remote 2 THERM Limit
0x64 (100
o
C)
If any temperature measured exceeds its THERM limit, all PWM outputs will 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 software or hardware locks up. If set to 0x80, this feature is disabled. The PWM output will remain at 100% until the
temperature drops below THERM limit  4rC .
These registers become read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to these registers
will have no effect.
Table XXIII. Temperature Hysteresis Registers
Register Address
R/W
Description
Power-On Default
0x6D
Read/Write
Remote 1, Local Temperature Hysteresis
0x44
0x6E
Read/Write
Remote 2 Temperature Hysteresis
0x40
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 will remain running at PWM
MIN
 duty cycle until the temperature = T
MIN
  hysteresis.
Up to 15
o
C of hysteresis may be assigned to any temperature channel. Setting the hysteresis value lower than 4
o
C will cause the fan
to switch on and off regularly when the temperature is close to T
MIN
.
These registers become read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to these registers
will have no effect.
Rev. 3 | Page 50 of 56 | www.onsemi.com
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