ADT7468 查看數據表（PDF） - ON Semiconductor

零件编号

产品描述 (功能)

生产厂家

ADT7468

dBCool® Remote Thermal Controller and Voltage Monitor

ON Semiconductor 

Bit 1= 0 is the high frequency (22.5 kHz) fan drive signal.

Bit 1 = 1 switches the fan drive to low frequency PWM,

programmable between 10 Hz and 100 Hz, the same as the

ADT7463. The default = 0 = HF PWM.

Bit 2 sets the direction for the GPIO: 0 = input, 1 = output.

Bit 3 sets the GPIO polarity: 0 = active low, 1 = active high.

Setting the Functionality of Pin 14

Pin 14 on the ADT7468 has four possible functions:

SMBALERT, THERM, GPIO, and TACH4. The user chooses

the required functionality by setting Bit 0 and Bit 1 of

Configuration Register 4 at Address 0x7D.

Table 4. Pin 14 Settings

Bit 0

Bit 1

Function

0

0

TACH4

0

1

THERM

1

0

SMBALERT

1

1

GPIO

ADT7468

RECOMMENDED IMPLEMENTATION

Configuring the ADT7468 as in Figure 15 allows the system

designer to use the following features:

• Two PWM outputs for fan control of up to three fans (the

front and rear chassis fans are connected in parallel).

• Three TACH fan speed measurement inputs.

• VCC measured internally through Pin 3.

• CPU temperature measured using Remote 1 temperature

channel.

• Ambient temperature measured through Remote 2

temperature channel.

• Bidirectional THERM pin. This feature allows Intel

Pentium 4 PROCHOT monitoring and can function as an

overtemperature THERM output. Alternatively, it can be

programmed as an SMBALERT system interrupt output.

FRONT

CHASSIS

FAN

ADT7468

TACH2

PWM1

TACH1

CPU FAN

REAR

CHASSIS

FAN

AMBIENT

TEMPERATURE

PWM3

TACH3 VID[0:4]/VID[0:5]

D2+

5(VRM9)/6(VRM10)

D2–

THERM

D1+

PROCHOT

D1–

CPU

3.3VSB

5V

12V/VID5

SDA

ADP316x

VRM

VCOMP

CURRENT

SCL

SMBALERT

CONTROLLER

VCORE GND

ICH

Figure 15. ADT7468 Configuration

Rev. 3 | Page 11 of 81 | www.onsemi.com

Share Link: