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ADT7473
Table 73. REGISTER 0X62 ? ENHANCED ACOUSTICS REGISTER 1 (POWER-ON DEFAULT = 0X00)
Bit No.
<2:0>
Mnemonic
ACOU
R/W (Note 1)
R/W
Description
These bits select the ramp rate applied to the PWM1 output. Instead of PWM1 jumping
instantaneously to its newly calculated speed, PWM1 ramps gradually 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
001 = 2
010 = 3
011 = 4
100 = 8
101 = 12
110 = 24
111 = 48
35 sec
17.6 sec
11.8 sec
7.0 sec
4.4 sec
3.0 sec
1.6 sec
0.8 sec
<3>
<4>
<5>
<6>
<7>
EN1
SYNC
MIN1
MIN2
MIN3
R/W
R/W
R/W
R/W
R/W
When this bit is 1, acoustic enhancement is enabled on PWM1 output.
SYNC = 1 synchronizes fan speed measurements on TACH2, TACH3, and TACH4 to PWM3.
This allows up to three fans to be driven from PWM3 output and their speeds to be measured.
SYNC = 0 synchronizes only TACH3 and TACH4 to PWM3 output.
When the ADT7473/ADT7473 ? 1 is in automatic fan control mode, this bit defines whether
PWM1 is off (0% duty cycle) or at PWM1 minimum duty cycle when the controlling
temperature is below its T MIN – hysteresis value.
0 = 0% duty cycle below T MIN ? hysteresis.
1 = PWM1 minimum duty cycle below T MIN ? hysteresis.
When the ADT7473/ADT7473 ? 1 is in automatic fan speed control mode, this bit defines
whether PWM2 is off (0% duty cycle) or at PWM2 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.
When the ADT7473/ADT7473 ? 1 is in automatic fan speed control mode, this bit defines
whether PWM3 is off (0% duty cycle) or at PWM3 minimum duty cycle when the controlling
temperature is below its T MIN ? hysteresis value.
0 = 0% duty cycle below T MIN ? hysteresis.
1 = PWM3 minimum duty cycle below T MIN ? hysteresis.
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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