ADT7481_14 datasheet(4/20 Pages) ONSEMI

Part #	ADT7481

Description	Dual Channel Temperature Sensor and Overtemperature Alarm

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ADT7481

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Table 5. ELECTRICAL CHARACTERISTICS (TA = −40°C to +120°C, VDD = 3.0 V to 3.6 V, unless otherwise noted)

Parameter

Conditions

Min

Typ

Max

Unit

Power Supply

Supply Voltage, VDD

3.0

3.30

3.6

V

Average Operating Supply Current, IDD

0.0625 Conversions/Sec Rate (Note 1)

−

3.0

4.0

mA

Standby Mode

−

5.0

30

mA

Undervoltage Lockout Threshold

VDD Input, Disables ADC, Rising Edge

−

2.55

−

V

Power-On-Reset Threshold

1.0

−

2.5

V

Temperature-to-Digital Converter

Local Sensor Accuracy (Note 2)

0

°C ≤ TA ≤ +70°C

0

°C ≤ TA ≤ +85°C

−40

≤ TA ≤ +100°C

−

±1

±1.5

±2.5

°C

Resolution

−

1.0

−

°C

Remote Diode Sensor Accuracy (Note 2)

0

°C ≤ TA ≤ +70°C, −55°C ≤ TD (Note 3) ≤ +150°C

0

°C ≤ TA ≤ +85°C, −55°C ≤ TD (Note 3) ≤ +150°C

−40

°C ≤ TA ≤ +100°C, −55°C ≤ TD (Note 3) ≤ +150°C

−

±1

±1.5

±2.5

°C

Resolution

−

0.25

−

°C

Remote Sensor Source Current

High Level (Note 4)

−

233

−

mA

Low Level (Note 4)

−

14

−

mA

Conversion Time

From Stop Bit to Conversion Complete (Both

Channels) One-shot Mode with Averaging

Switched On

−

73

94

ms

One-shot Mode with Averaging Off

(Conversion Rate = 16, 32, or 64 Conversions

per Second)

−

11

14

ms

Open-Drain Digital Outputs (THERM, ALERT/THERM2)

Output Low Voltage, VOL

IOUT = −6.0 mA

−

0.4

V

High Level Output Leakage Current, IOH

VOUT = VDD

−

0.1

1.0

mA

SMBus Interface (Notes 4 and 5)

Logic Input High Voltage, VIH

SCLK, SDATA

2.1

−

V

Logic Input Low Voltage, VIL

SCLK, SDATA

−

0.8

V

Hysteresis

−

500

−

mV

SDA Output Low Voltage, VOL

IOUT = −6.0 mA

−

0.4

V

Logic Input Current, IIH, IIL

−1.0

−

+1.0

mA

SMBus Input Capacitance,

SCLK, SDATA

−

5.0

−

pF

SMBus Clock Frequency

−

400

kHz

SMBus Timeout (Note 6)

User Programmable

−

25

32

ms

SCLK Falling Edge to SDATA Valid Time

Master Clocking in Data

−

1.0

ms

1. See Table 11 for information on other conversion rates.

2. Averaging enabled.

3. Guaranteed by characterization, not production tested.

4. Guaranteed by design, not production tested.

5. See Timing Specifications section for more information.

6. Disabled by default. See the Serial Bus Interface section for details to enable it.

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