ADT7481ARMZ-R7 데이터 시트보기 (PDF) - ON Semiconductor
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ADT7481ARMZ-R7 Datasheet PDF : 20 Pages
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ADT7481
PIN ASSIGNMENT
Pin No.
1
2
Mnemonic
VDD
D1+
3
D1−
4
THERM
5
GND
6
D2−
7
D2+
8
ALERT/THERM2
9
SDATA
10
SCLK
Description
Positive Supply, 3.0 V to 3.6 V.
Positive Connection to the Remote 1 Temperature Sensor.
Negative Connection to the Remote 1 Temperature Sensor.
Open−Drain Output. Requires pullup resistor. Signals overtemperature events, could be used to turn a
fan on/off, or throttle a CPU clock.
Supply Ground Connection.
Negative Connection to the Remote 2 Temperature Sensor.
Positive Connection to the Remote 2 Temperature Sensor.
Open−Drain Logic Output. Used as interrupt or SMBALERT. 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.
TIMING SPECIFICATIONS (Note 1)
Parameter
fSCLK
tLOW
tHIGH
tR
tF
tSU; STA
tHD; STA
(Note 2)
Limit at TMIN and TMAX
400
4.7
4.0
1.0
300
4.7
4.0
Unit
kHz max
ms min
ms min
ms max
ns max
ms min
ms min
tSU; DAT
(Note 3)
250
ns min
tSU; STO
(Note 4)
4.0
ms min
tBUF
4.7
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.
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
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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