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ADT7461ARMZ-2

±1°C Temperature Monitor with Series Resistance Cancellation

ON Semiconductor 

ADT7461

PIN ASSIGNMENT

Pin No.

1

2

Mnemonic

VDD

D+

3

D−

4

THERM

5

GND

6

ALERT/THERM2

7

SDATA

8

SCLK

Description

Positive Supply, 3.0 V to 5.5 V.

Positive Connection to Remote Temperature Sensor.

Negative Connection to Remote Temperature Sensor.

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

overtemperature condition. Requires pullup to VDD.

Supply Ground Connection.

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

second THERM output. Requires pullup resistor.

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

Logic Input, SMBus Serial Clock. Requires pullup resistor.

SMBus TIMING SPECIFICATIONS (Note 1)

Parameter

Limit at TMIN and TMAX

fSCLK

400

tLOW

1.3

tHIGH

0.6

tR

300

tF

300

tSU; STA

600

tHD; STA (Note 2)

600

tSU; DAT (Note 3)

100

tHD; DAT

300

tSU; STO (Note 4)

600

tBUF

1.3

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.

Unit

kHz max

ms min

ms min

ns max

ns max

ns min

ns min

ns min

ns min

ns min

ms min

Description

−

Clock low period, between 10% points.

Clock high period, between 90% points.

Clock/data rise time.

Clock/data fall time.

Start condition setup time.

Start condition hold time.

Data setup time.

Data hold time.

Stop condition setup time.

Bus free time between stop and start conditions.

SCLK

SDATA

tBUF

STOP START

tLOW

tR

tHD;STA

tHD;DAT

tF

tHIGH

tSU;DAT

tHD;STA

tSU;STA

START

Figure 2. Serial Bus Timing

tSU;STO

STOP

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