ADT7461

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3

Table 3. PIN ASSIGNMENT

Pin No.

Mnemonic

Description

1

Positive Supply, 3.0 V to 5.5 V.

2

D+

Positive Connection to Remote Temperature Sensor.

3

D−

Negative Connection to Remote Temperature Sensor.

4

THERM

Open-Drain output that can be used to turn a fan on/off or throttle a CPU clock in the event of an

5

GND

Supply Ground Connection.

6

ALERT/THERM2

Open-Drain Logic Output Used as Interrupt or SMBus Alert. This may also be configured as a

second THERM output. Requires pullup resistor.

7

SDATA

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

8

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

ns max

Clock/data rise time.

300

ns max

Clock/data fall time.

600

ns min

Start condition setup time.

600

ns min

Start condition hold time.

100

ns min

Data setup time.

300

ns min

Data hold time.

600

ns min

Stop condition setup time.

1.3

ms min

Bus free time between stop and start conditions.

1. Guaranteed by design, but 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

STOP

START

STOP START

SCLK

SDATA