ADT7468 Analog Devices, Inc., ADT7468 Datasheet - Page 74

• Manufacturer Part Number: ADT7468
• Description: Dbcool Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

ADT7468
Table 37. Register 0x63 – Enhanced Acoustics Register 2 (Power-On Default = 0x00)
Bit
<2:0>
< 3 >
<6:4>
<7>
1
Table 38. PWM Minimum Duty Cycle Registers
Register Address
0x64
0x65
0x66
Bit
<7:0>
1
Table 39. T
Register Address
0x67
0x68
0x69
1
2
These registers become read-only when the ADT7468 is in automatic fan control mode.
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.
These are the 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.
with temperature according to T
Name
ACOU3
EN3
ACOU2
EN2
MIN
MIN
Name
PWM duty cycle
Registers
registers for each temperature channel. When the temperature measured exceeds T
R/W
Read/write
Read/write
Read/write
Read/write
1
1
RANGE
.
R/W
Read/write
Read/write
Read/write
R/W
Read/write
R/W
Read/write
Read/write
Read/write
Description
These bits select the ramp rate applied to the PWM3 output. Instead of PWM3 jumping instantaneously to
its newly calculated speed, PWM3 ramps gracefully 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 instantaneously to
its newly calculated speed, PWM2 ramps gracefully 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 enhancement is enabled on PWM2 output.
1
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 temperatue T
Remote 2 temperature T
Rev. A | Page 74 of 84
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
MIN
.
MIN
MIN
MIN
.
.
MIN
duty cycle for PWMx.
, the appropriate fan runs at minimum speed and increases
Power-On Default
0x80 (50% duty cycle)
0x80 (50% duty cycle)
0x80 (50% duty cycle)
Power-On Default
0x5A (90°C)
0x5A (90°C)
0x5A (90°C)