ADT7475 Analog Devices, Inc., ADT7475 Datasheet - Page 56

• Manufacturer Part Number: ADT7475
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

ADT7475
Table 32. Temp T
Register Address
0x5F
0x60
0x61
1
Table 33. Register 0x5F, Register 0x60, and Register 0x61—Temp T
Bit
[2:0]
[3]
[7:4]
These registers become read-only when the Configuration Register 1 lock bit is set. Any subsequent attempts to write to these registers fail.
Name
FREQ
HF/LF
RANGE
RANGE
R/W
R/W
R/W
R/W
/PWM Frequency Registers
Description
These bits control the PWMx frequency.
000 = 11.0 Hz
001 = 14.7 Hz
010 = 22.1 Hz
011 = 29.4 Hz
100 = 35.3 Hz (default)
101 = 44.1 Hz
110 = 58.8 Hz
111 = 88.2 Hz
HF/LF =1, enables high frequency PWM output for 4-wire fans. Once enabled, 3-wire fan-specific settings have no
effect (this means, pulse stretching).
These bits determine the PWM duty cycle vs. the temperature slope for automatic fan control.
0000 = 2°C
0001 = 2.5°C
0010 = 3.33°C
0011 = 4°C
0100 = 5°C
0101 = 6.67°C
0110 = 8°C
0111 = 10°C
1000 = 13.33°C
1001 = 16°C
1010 = 20°C
1011 = 26.67°C
1100 = 32°C (default)
1101 = 40°C
1110 = 53.33°C
1111 = 80°C
R/W
R/W
R/W
R/W
1
Description
Remote 1 T
Local T
Remote 2 T
RANGE
Rev. B | Page 56 of 68
RANGE
/PWM2 frequency.
RANGE
/PWM1 frequency.
/PWM3 frequency.
RANGE
/PWM Frequency Registers (Power-On Default = 0xC4)
Power-On Default
0xC4
0xC4
0xC4