ADT7463

http://onsemi.com

3

Table 1. ABSOLUTE MAXIMUM RATINGS

Parameter

Rating

Unit

6.5

V

20

V

Voltage on Any Input or Output Pin

−0.3 to +6.5

V

Input Current at Any Pin

±5

mA

Package Input Current

±20

mA

150

°C

Storage Temperature Range

−65 to +150

°C

Lead Temperature, Soldering

IR Reflow Peak Temperature

IR Reflow Peak Temperature for Pb−Free

Lead Temperature (Soldering, 10 sec)

220

260

300

°C

ESD Rating

1500

V

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

Table 2. THERMAL CHARACTERISTICS

Package Type

Unit

24−lead QSOP

105

39

°C/W

Table 3. PIN ASSIGNMENT

Pin No.

Mnemonic

Description

1

SDA

Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus.

2

SCL

Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull−up.

3

GND

Ground Pin for the ADT7463.

4

Power Supply. Can be powered by 3.3 V standby if monitoring in low power states is required.

correctly measure a 5 V supply.

5

VID0

Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID

register (Reg. 0x43).

6

VID1

Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID

register (Reg. 0x43).

7

VID2

Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID

register (Reg. 0x43).

8

VID3

Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID

register (Reg. 0x43).

9

TACH3

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3. Can be

reconfigured as an analog input (AIN3) to measure the speed of 2−wire fans.

10

PWM2

SMBALERT

Digital Output (Open Drain). Requires 10 kW typical pull−up. Pulse−width modulated output to

control FAN 2 speed.

Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output

to signal out−of−limit conditions.

11

TACH1

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1. Can be

reconfigured as an analog input (AIN1) to measure the speed of 2−wire fans.

12

TACH2

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2. Can be

reconfigured as an analog input (AIN2) to measure the speed of 2−wire fans.

13

PWM3

ADDRESS ENABLE

Digital I/O (Open Drain). Pulse−width modulated output to control Fan 3/Fan 4 speed.

Requires 10 kW typical pull−up.

If pulled low on power−up, this places the ADT7463 into address select mode, and the state of

Pin 14 will determine the ADT7463’s slave address.