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Table 68. REGISTER 0x63 − ENHANCED ACOUSTICS REGISTER 2 (POWER-ON DEFAULT = 0x00)
Bit No.
Mnemonic
[2:0]
ACOU3
[3]
EN3
[6:4]
ACOU2
[7]
EN2
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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ADT7476A
R/W
R/W
Assuming that PWMx is associated with the local temperature channel, these bits define the
maximum rate of change of the PWMx output for local 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
R/W
When this bit is 1, smoothing is enabled on the local temperature channel.
R/W
Assuming that PWMx is associated with the Remote 2 temperature channel, these bits define
the maximum rate of change of the PWMx output for Remote 2 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
R/W
When this bit is 1, smoothing is enabled on the Remote 2 temperature channel.
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Description
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
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
60
(Note 1)
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