adt7476a Analog Devices, Inc., adt7476a Datasheet - Page 61

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adt7476a

Manufacturer Part Number
adt7476a
Description
Dbcool Remote Thermal Controller And Voltage Monitor
Manufacturer
Analog Devices, Inc.
Datasheet

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Table 36. Register 0x62—Enhance Acoustics Register 1 (Power-On Default = 0x00)
Bit
[2:0]
[3]
[4]
[5]
[6]
[7]
1
2
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.
Setting the relevant bit of Configuration Register 6, (0x10, [2:0]), further decreases these ramp rates by a factor of 4.
Name
ACOU
EN1
SYNC
MIN1
MIN2
MIN3
2
R/W
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
1
Description
Assuming that PWMx is associated with the Remote 1 temperature channel, these bits define the maximum
rate of change of the PWMx output for Remote 1 temperature-related changes. Instead of the fan speed
jumping instantaneously to its newly determined speed, it ramps gracefully at the rate determined by
these bits. This feature ultimately enhances the acoustics of the fan.
When Bit 7 of Configuration Register 6 (0x10) is 0
Time Slot Increase
000 = 1
001 = 2
010 = 3
011 = 4
100 = 8
101 = 12
110 = 24
111 = 48
When Bit 7 of Configuration Register 6 (0x10) is 1
Time Slot Increase
000 = 1
001 = 2
010 = 3
011 = 4
100 = 8
101 = 12
110 = 24
111 = 48
When this bit is 1, smoothing is enabled on Remote 1 temperature channel.
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 ADT7476A 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
0 = 0% duty cycle below T
1 = PWM1 minimum duty cycle below T
When the ADT7476A 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
0 = 0% duty cycle below T
1 = PWM 2 minimum duty cycle below T
When the ADT7476A 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
0 = 0% duty cycle below T
1 = PWM3 minimum duty cycle below T
MIN
MIN
MIN
Time for 0% to 100%
37.5 sec
18.8 sec
12.5 sec
7.5 sec
4.7 sec
3.1 sec
1.6 sec
0.8 sec
Time for 0% to 100%
52.2 sec
26.1 sec
17.4 sec
10.4 sec
6.5 sec
4.4 sec
2.2 sec
1.1 sec
– hysteresis.
– hysteresis.
– hysteresis.
Rev. 0 | Page 61 of 72
MIN
MIN
MIN
– hysteresis.
– hysteresis.
– hysteresis.
MIN
– hysteresis value.
MIN
MIN
– hysteresis value.
– hysteresis value.
ADT7476A

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