ADT7473 Analog Devices, Inc., ADT7473 Datasheet - Page 69

• Manufacturer Part Number: ADT7473
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

Table 38. Register 0x63—Enhance Acoustics Register 2 (Power-On Default = 0x00)
Bit
[2:0]
[3]
[6:4]
[7]
1
Table 39. PWM Minimum Duty Cycle Registers
Register Address
0x64
0x65
0x66
1
Table 40. Register 0x64, Register 0x65, and Register 0x66—PWM Minimum Duty Cycle Registers (Power-On Default = 0x80, 50%
duty cycle)
Bit
<7:0>
Table 41. T
Register Address
0x67
0x68
0x69
1
2
This register becomes read-only when the Configuration Register 1
These registers become read-only when the Configuration Register 1 lock bit is set. Any further attempts to write to these registers have no effect.
These are the T
with temperature according to T
These registers become read only when the Configuration Register 1 lock bit is set. Any further attempts to write to these registers have no effect.
Name
ACOU3
EN3
ACOU2
EN2
MIN
Name
PWM duty cycle
MIN
Registers
registers for each temperature channel. When the temperature measured exceeds T
R/W
R/W
R/W
R/W
R/W
1
1
RANGE
Description
These bits select the ramp rate applied to the PWM3 output. Instead of PWM3 jumping instantly to its
newly calculated speed, PWM3 ramps gradually at the rate determined by these bits. This effect enhances
the acoustics of the fan being driven by the PWM3 output.
Time Slot Increase
000 = 1
001 = 2
010 = 3
011 = 5
100 = 8
101 = 12
110 = 24
111 = 48
When this bit is 1, acoustic enhancement is enabled on PWM3 output.
These bits select the ramp rate applied to the PWM2 output. Instead of PWM2 jumping instantly to its
newly calculated speed, PWM2 ramps gradually at the rate determined by these bits. This effect enhances
the acoustics of the fans being driven by the PWM2 output.
Time Slot Increase
000 = 1
001 = 2
010 = 3
011 = 5
100 = 8
101 = 12
110 = 24
When this bit is 1, acoustic
.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
2
Description
PWM1 minimum duty cycle.
PWM2 minimum duty cycle.
PWM3 minimum duty cycle.
Description
These bits define the PWM
0x00 = 0% duty cycle (fan off ).
0x40 = 25% duty cycle.
0x80 = 50% duty cycle.
0xFF = 100% duty cycle (fan full speed).
Description
Remote 1 temperature T
Local temperature T
Remote 2 temperature T
lock bi
enha
Time for 33% to 100%
35 sec
17.6 sec
11.8 sec
7 sec
4.4 sec
3 sec
1.6 sec
0.8 sec
Time for 33% to 100%
35 sec
17.6 sec
11.8 sec
7 sec
4.4 sec
3 sec
1.6 sec
Rev. A | Page 69 of 76
t is s
nceme
et to 1. Any further attempts t
nt is ena
MIN
bled on PWM2 output.
.
MIN
MIN
MIN
.
.
MIN
duty cycle for PWMx.
, the appropriate fan runs at minimum speed and increases
o write to this register have no effect.
Power-On Default
0x80 (50% duty cycle)
0x80 (50% duty cycle)
0x80 (50% duty cycle)
Power-On Default
0x9A (90°C)
0x9A (90°C)
0x9A (90°C)
ADT7473