adt7476a Analog Devices, Inc., adt7476a Datasheet - Page 62

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

ADT7476A
Table 37. Register 0x63—Enhance Acoustics Register 2 (Power-On Default = 0x00)
Bit
[2:0]
[3]
[6:4]
[7]
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.
Name
ACOU3
EN3
ACOU2
EN2
R/W
Read/Write
Read/Write
Read/Write
Read/Write
1
When this bit is 1, smoothing is enabled on the local temperature channel.
When this bit is 1, smoothing is enabled on the Remote 2 temperature channel.
Description
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
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
Rev. 0 | Page 62 of 72
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