ADT7481

http://onsemi.com

4

Parameter

Conditions

Min

Typ

Max

Unit

Power Supply

3.0

3.30

3.6

V

0.0625 Conversions/Sec Rate (Note 1)

3.0

4.0

mA

Standby mode

5.0

30

mA

Undervoltage Lockout Threshold

2.55

V

Power−On−Reset Threshold

1.0

2.5

V

Temperature−To−Digital Converter

Local Sensor Accuracy (Note 2)

±1

±1.5

±2.5

°C

Resolution

1.0

°C

Remote Diode Sensor Accuracy (Note 2)

±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)

0.4

V

0.1

1.0

mA

SMBus Interface (Notes 4 and 5)

SCLK, SDATA

2.1

V

SCLK, SDATA

0.8

V

Hysteresis

500

mV

0.4

V

−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 6 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.