ADT7490ARQZ-R7 datasheet(38/75 Pages) ONSEMI

38 / 75 page

ADT7490

http://onsemi.com

Figure 53. TRANGE Parameter Affects Cooling Slope

TEMPERATURE

TMIN

100%

PWMMIN

TRANGE

The TRANGE is determined by the following procedure:

1. Determine the maximum operating temperature for

that channel (for example, 70

°C).

2. Determine experimentally the fan speed (PWM

duty cycle value) that does not exceed the

temperature at the worst−case operating points.

For example, 70

°C is reached when the fans are

running at 50% PWM duty cycle.

3. Determine the slope of the required control loop to

meet these requirements.

4. Using the ADT7490 evaluation software,

graphically program and visualize this

functionality. Ask a local Analog Devices

representative for details.

As PWMMIN is changed, the automatic fan control slope

changes.

Figure 54. Adjusting PWMMIN Changes the Automatic

Fan Control Slope

TMIN

100%

33%

50%

305C

As TRANGE is changed, the slope changes. As TRANGE

gets smaller, the fans reach 100% speed with a smaller

temperature change.

Figure 55. Increasing TRANGE Changes the

AFC Slope

TMIN

TMIN–HYST

100%

305C

405C

10%

455C

545C

Figure 56. Changing PWM Max Does Not Change the

AFC Slope

100%

MAX

PWM

TRANGE

10%

TMIN–HYST

Selecting TRANGE

The TRANGE value can be selected for each temperature

channel: Remote 1, local, Remote 2, and PECI temperature.

Bits [7:4] (TRANGE) of Register 0x5F to Register 0x61 and

temperature channel.

Table 19. Selecting a TRANGE Value

Bits [7:4] (Note 1)

TRANGE (5C)

0000

0001

2.5

0010

3.33

0011

0100

0101

6.67

0110

0111

1000

13.33

1001

1010

1011

26.67

1100

32 (default)

1101

1110

53.33

1111

1. Register 0x5F configures Remote 1 TRANGE; Register 0x60

configures local TRANGE; Register 0x61 configures Remote 2

TRANGE, Register 0x3C configures PECI TRANGE.

ADT7490ARQZ-R7 bảng dữ liệu(PDF) 38 Page - ON Semiconductor

ADT7490ARQZ-R7 bảng dữ liệu(HTML) 38 Page - ON Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75

bảng dữ liệu tải về

Link URL