ASC7521A 查看數據表（PDF） - Unspecified

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ASC7521A

LOW- OLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR

Unspecified 

aSC7521A

Absolute Maximum Ratings1

Parameter

Rating

Supply Voltage, VDD

Voltage on any Digital Input or Output3

Input Current on any pin3

Package Input Current3

Relative Humidity (non-operating)

Maximum Junction Temperature, TJmax

Storage Temperature Range

IR Reflow Peak Temperature

Lead Soldering Temperature (10 sec.)

-0.3, +3.63V

-0.3V to VDD +

0.3V

±5mA

±20mA

5% - 85% RH

@ 25°C to 70°C

150°C

-60°C to +150°C

260°C

300°C

ESD5

Human Body Model

Machine Model

Charged-Device Model

2000 V

250 V

>1000 V

Notes:

1. Absolute maximum ratings are limits beyond which operation

may cause permanent damage to the device. These are

stress ratings only; functional operation at or above these

limits is not implied. For guaranteed specifications and test

conditions, see the Electrical Characteristics. The guaranteed

specifications apply only for the test conditions listed. Some

performance characteristics may degrade when the device is

not operated under the listed test conditions.

2. All voltages are measured with respect to GND, unless

otherwise specified.

3. When the input voltage (VIN) at any pin exceeds the power

supplies (VIN< (GND or GNDA) or VIN>V+, except for SST

and analog voltage inputs), the current at that pin should be

limited to 5mA. The 20mA maximum package input current

rating limits to number of pins that can safely exceed the

power supplies with an input current of 5mA to four.

4. The maximum power dissipation must be de-rated at elevated

temperatures and is dictated by TJmax, θJA and the ambient

temperature, TA. The maximum allowable power dissipation at

any temperature is PD = (TJmax - TA) / θJA. It must also take

into account self-heating that can adversely affect the

accuracy of internal sensors.

5. Human Body Model: 100pF capacitor discharged through a

1.5kΩ resistor into each pin. Machine Model: 200pF capacitor

discharged directly into each pin. Charged-Device Model is

per JESD22-C101C.

Electrical Characteristics6

(-40°C ≤ T A ≤ +125°C, V D D = 3 . 3 V unless otherwise noted. Specifications subject to change without notice)

Parameter

Conditions

Min

Typ

Max

Units

Supply Voltage

VDD

3.0

3.3

3.6

V

SST Signal

Meets SST Specification Version 1.0

for 1.5V interface

Local Sensor Accuracy7, 8

-40°C ≤ T A ≤ +125°C

40°C ≤ T A ≤ 70°C

±3

°C

±2

°C

Local Sensor Resolution

0.125

°C

Remote Diode Sensor Accuracy7, 8, 9

0°C ≤ T A ≤ 70°C,

-40°C≤TD ≤+125°C

0°C ≤ T A ≤ 70°C,

50°C≤TD ≤70°C

±3

°C

±1

°C

Remote Diode Sensor Resolution

Temperature Monitor Cycle Time10

tC

0.125

°C

0.2

Sec

Notes:

6. These specifications are guaranteed only for the test conditions listed.

7. Accuracy (expressed in °C) = Difference between the aSC7521A reported temperature and the device temperature.

8. The aSC7521A can be read at any time without interrupting the temperature conversion process.

9. Calibration of the remote diode sensor input is set to meet the accuracy limits with a CPU thermal diode that has a non-ideality factor of

1.009 with a series resistance of 4.52Ω.

10. Total monitoring cycle time for all temperature and analog input voltage measurements is 0.2 second.

© Andigilog, Inc. 2006

-2-

www.andigilog.com

October 2006 - 70A05011

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