ADT7467
Table 62. REGISTER 0X62 ? ENHANCED ACOUSTICS REGISTER 1 (POWER-ON DEFAULT = 0X00)
Bit
<2:0>
<3>
<4>
Name
ACOU
EN1
SYNC
R/W (Note 1)
Read/Write
Read/Write
Read/Write
Description
These bits select the ramp rate applied to the PWM1 output. Instead of PWM1 jumping instant-
aneously to its newly calculated speed, PWM1 ramps 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
11.8 sec
011 = 5
7 sec
100 = 8
4.4 sec
101 = 12
3 sec
110 = 24
1.6 sec
111 = 48
0.8 sec
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.
<5>
MIN1
Read/Write
When the ADT7467 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.
<6>
MIN2
Read/Write
When the ADT7467 is in automatic fan speed control mode and the controlling temperature is
below its T MIN – hysteresis value, this bit defines whether PWM2 is off (0% duty cycle) or at
PWM2 minimum duty cycle.
0 = 0% duty cycle below T MIN – hysteresis.
1 = PWM2 minimum duty cycle below T MIN – hysteresis.
<7>
MIN3
Read/Write
When the ADT7467 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 a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this
register fail.
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63
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