ADT7482

http://onsemi.com

3

PIN ASSIGNMENT

Pin No.

Mnemonic

Description

1

Positive Supply, 3.0 V to 3.6 V.

2

D1+

Positive Connection to the First Remote (Remote 1) Temperature Sensor.

3

D1−

Negative Connection to the First Remote (Remote 1) Temperature Sensor.

4

THERM

Open−Drain Output. This pin can be used to turn a fan on/off or throttle a CPU clock in the event of an

overtemperature condition. Requires pullup resistor.

5

GND

Supply Ground Connection.

6

D2−

Negative Connection to the Second Remote (Remote 2) Temperature Sensor.

7

D2+

Positive Connection to the Second Remote (Remote 2) Temperature Sensor.

8

ALERT/THERM2

Open−Drain Logic Output. This pin is used as interrupt or SMBus alert. May also be configured as a

second THERM output. Requires pullup resistor.

9

SDATA

Logic Input/Output, SMBus Serial Data. Open−Drain Output. Requires pullup resistor.

10

SCLK

Logic Input, SMBus Serial Clock. Requires pullup resistor.

Parameter

Unit

Description

400

kHz max

1.3

ms min

Clock low period, between 10% points

0.6

ms min

Clock high period, between 90% points

300

ms max

Clock/data rise time

300

ns max

Clock/data fall time

600

ms min

Start condition setup time

(Note 2)

600

ms min

Start condition hold time

(Note 3)

100

ns min

Data setup time

(Note 4)

600

ms min

Stop condition setup time

1.3

ms min

Bus free time between stop and start conditions

1. Guaranteed by design, not production tested.

2. Time from 10% of SDATA to 90% of SCLK.

3. Time for 10% or 90% of SDATA to 10% of SCLK.

4. Time for 90% of SCLK to 10% of SDATA.

Figure 2. Serial Bus Timing

SCLK

SDATA

STOP START

STOP

START