ADT7481ARMZ datasheet(3/24 Pages) AD

3 / 24 page

ADT7481

Rev. 0 | Page 3 of 24

SPECIFICATIONS

TA = −40°C to +120°C, VDD = 3 V to 3.6 V, unless otherwise noted.

Table 1.

Parameter

Min

Typ

Max

Unit

Test Conditions

POWER SUPPLY

Supply Voltage, VDD

3.0

3.30

3.6

Average Operating Supply Current, IDD

240

350

μA

0.0625 conversions/sec rate1

μA

Standby mode

Undervoltage Lockout Threshold

2.55

VDD input, disables ADC, rising edge

Power-On-Reset Threshold

2.5

TEMPERATURE-TO-DIGITAL CONVERTER

Local Sensor Accuracy2

±1

°C

0°C ≤ TA ≤ +70°C

±1.5

0°C ≤ TA ≤ +85°C

±2.5

°C

−40 ≤ TA ≤ +100°C

Resolution

°C

Remote Diode Sensor Accuracy2

±1

°C

0°C ≤ TA ≤ +70°C, −55°C ≤ TD3≤ +150°C

±1.5

°C

0°C ≤ TA ≤ +85°C, −55°C ≤ TD3 ≤ +150°C

±2.5

°C

−40°C ≤ TA ≤ +100°C, −55°C ≤ TD3 ≤ +150°C

Resolution

0.25

°C

Remote Sensor Source Current

233

μA

High level4

μA

Low level4

Conversion Time

From stop bit to conversion complete (both channels) one-shot

mode with averaging switched on

One-shot mode with averaging off (conversion rate = 16, 32, or

64 conversions per second)

OPEN-DRAIN DIGITAL OUTPUTS: THERM,

ALERT/THERM2

Output Low Voltage, VOL

0.4

IOUT = −6.0 mA

High Level Output Leakage Current, IOH

0.1

μA

VOUT = VDD

SMBus INTERFACE4, 5

Logic Input High Voltage, VIH

2.1

SCLK, SDATA

Logic Input Low Voltage, VIL

0.8

SCLK, SDATA

Hysteresis

500

SDA Output Low Voltage, VOL

0.4

IOUT = −6.0 mA

Logic Input Current, IIH, IIL

−1

μA

SMBus Input Capacitance, SCLK, SDATA

SMBus Clock Frequency

400

kHz

SMBus Timeout6

User programmable

SCLK Falling Edge to SDATA Valid Time

μs

Master clocking in data

1 See Table 10 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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