REV. A
48
ADM1027
Table XVIII. Register 0x62 Enhance Acoustics Register 1 (Power-On Default = 0x00)
Bit
Name
R/W
Description
<2:0>
ACOU
Read-Only
These bits select the ramp rate applied to the PWM1 output. Instead of PWM1 jump-
ing instantaneously to its newly calculated speed, PWM1 will ramp gracefully at the rate
determined by these bits. This feature enhances the acoustics of the fan being driven by
the PWM1 output.
Time slot increase
Time for 33% to 100%
000 = 1
35 sec
001 = 2
17.6 sec
010 = 3
1.8 sec
011 = 5
7 sec
100 = 8
4.4 sec
101 = 12
3 sec
110 = 24
1.6 sec
111 = 48
0.8 sec
<3>
EN1
Read/Write
When this bit is 1, acoustic enhancement is enabled on PWM1 output. When
acoustic enhancement is enabled, fan spin-up time should be disabled.
<4>
Reserved
Read-Only
Reserved for future use.
<5>
MIN1
Read/Write
When the ADM1027 is in automatic fan control mode, this bit defines whether PWM 1
is off (0% duty cycle) or at PWM 1 minimum duty cycle when the controlling temperature
is below its T
MIN
hysteresis value.
0 = 0% duty cycle below T
MIN
hysteresis
1 = PWM 1 minimum duty cycle below T
MIN
hysteresis
<6>
MIN2
Read/Write
When the ADM1027 is in automatic fan speed control mode, this bit defines whether
PWM 2 is off (0% duty cycle) or at PWM 2 minimum duty cycle when the controlling
temperature is below its T
MIN
hysteresis value.
0 = 0% duty cycle below T
MIN
hysteresis
1 = PWM 2 minimum duty cycle below T
MIN
hysteresis
<7>
MIN3
Read/Write
When the ADM1027 is in automatic fan speed control mode, this bit defines whether
PWM 3 is off (0% duty cycle) or at PWM 3 minimum duty cycle when the controlling
temperature is below its T
MIN
hysteresis value.
0 = 0% duty cycle below T
MIN
hysteresis
1 = PWM 3 minimum duty cycle below T
MIN
hysteresis
This register becomes read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register
will have no effect.
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