ADT7462 データシートの表示（PDF） - Analog Devices

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ADT7462

Flexible Temperature and Voltage Monitor and System Fan Controller

Analog Devices 

ADT7462

FUNCTIONAL DESCRIPTION:

EASY CONFIGURATION OPTIONS

There are a number of multifunctional pins on the ADT7462

that need to be configured on power-up to suit the desired

application. Note that due to the large number of pins that need

to be configured, it could take several SMBus transactions to

achieve the required configuration. For this reason, the ADT7462

has five easy configuration options. The user sets a bit in the

easy configuration option register (0x14) to set up the required

configuration (see Table 5).

Table 5. Easy Configuration Register Settings

Easy Configuration Option

Register 0x14 Setting

Option 1

Bit 0 = 1

Option 2

Bit 1 = 1

Option 3

Bit 2 = 1

Option 4

Bit 3 = 1

Option 5

Bit 4 = 1

Once the most convenient easy configuration option has been

set, the user can configure any of the pins individually. The

setup complete bit (Bit 5 of Register 0x01) must then be set to 1

to indicate that the ADT7462 is configured correctly, and then

monitoring of the selected channels begins.

The following is a detailed description of the five easy

configuration options that are available.

Configuration Option 1

Configuration Option 1 is the default configuration. It is also

the most suitable for thermal monitoring, voltage monitoring,

and fan control for single and dual processor systems.

Features of Configuration Option 1 include the following:

One local and three remote temperature channels

Four PWM drives and eight TACH inputs

Two THERM I/Os

Voltage monitoring

+3.3V

+2.5V

+1.8V

VBATT

RESET I/O

CI (chassis intrusion) or FAN2MAX

Figure 4 shows the pin configuration when Configuration

Option 1 is chosen.

TACH1 1

TACH2 2

TACH3 3

TACH4 4

VCC 5

GND 6

TACH5 7

TACH6 8

PIN 1

INDICATOR

ADT7462

TOP VIEW

(Not to Scale)

24 +2.5V

23 +1.8V

22 TACH8

21 TACH7

20 D3–

19 D3+

18 D2–

17 D2+

Figure 4. Configuration Option 1

Table 6. Configuration Option 1

Pin Function Configuration Register

11 TACH1

Pin Configuration Register 1

21 TACH2

Pin Configuration Register 1

31 TACH3

Pin Configuration Register 1

41 TACH4

Pin Configuration Register 1

7 TACH5

Pin Configuration Register 1

8 TACH6

Pin Configuration Register 2

13 PWM4

Pin Configuration Register 2

15 D1+

Pin Configuration Register 1

16 D1−

Pin Configuration Register 1

19 D3+

Pin Configuration Register 1

20 D3−

Pin Configuration Register 1

21 TACH7

Pin Configuration Register 2

22 TACH8

Pin Configuration Register 2

23 +1.8V

Pin Configuration Register 2

24 +2.5V

Pin Configuration Register 3

25 +3.3V

Pin Configuration Register 3

26 VBATT

Pin Configuration Register 3

27 CI

Pin Configuration Register 3

281 THERM1 Pin Configuration Register 4

29 THERM2 Pin Configuration Register 4

311 PWM1

Pin Configuration Register 4

321 PWM2

Pin Configuration Register 4

Bit Value

Bit 4 = 1

Bit 3 = 1

Bit 2 = 1

Bit 1 = 1

Bit 0 = 1

Bit 7 = 1

Bit 6 = 1

Bit 6 = 1

Bit 6 = 1

Bit 5 = 1

Bit 5 = 1

Bit 3 = 1

Bit 2 = 1

Bits [1:0] = 10

Bits [7:6] = 01

Bits [5:4] = 00

Bits [3:2] = 00

Bit 1 = 1

Bits [7:6] = 1×

Bits [5:4] = 1×

Bit 3 = 1

Bit 2 = 1

1 If VIDs are selected, these pins are configured as VIDs. To enable VIDs, set Bit 7

of Pin Configuration Register 1 (0x10) = 1.

Rev. 0 | Page 10 of 92

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