ADT7421ARMZ-2RL View Datasheet(PDF) - ON Semiconductor

Part Name

Description

MFG CO.

ADT7421ARMZ-2RL

Precision Temperature Sensor with Beta Compensation (for <45 nm Geometries)

ON Semiconductor 

ADT7421

ELECTRICAL CHARACTERISTICS (TA = −40°C to +125°C, VDD = 3.0 V to 3.6 V, unless otherwise noted)

Parameter

Power Supply

Conditions

Min

Typ

Max Unit

Supply Voltage, VDD

Average Operating Supply Current, IDD

Standby Mode Supply Current

Power-On-Reset Threshold

0.0625 Conversions/Sec Rate (Note 1)

−40°C ≤ TA ≤ +85°C

−40°C ≤ TA ≤ +125°C

3.0

3.30

3.6

V

3.0

4.0

mA

10

mA

20

1.0

2.8

V

Temperature−To−Digital Converter

Local Sensor Accuracy

Resolution

0°C ≤ TA ≤ +125°C

±2.75 °C

1.0

°C

Remote Transistor Sensor Accuracy

Resolution

+40°C ≤ TA ≤ +85°C, +60°C ≤ TD ≤ +110°C (Note 2)

+25°C ≤ TA ≤ +85°C, +60°C ≤ TD ≤ +110°C (Note 2)

TA = +40°C, +60°C ≤ TD ≤ +110°C (Note 2)

±2.5

°C

±3.25

±1.75

0.25

°C

Remote Sensor Source Current

The range of source currents provided to the external

10 to

mA

thermal transistor for temperature measurements.

360

Conversion Time

From stop bit to conversion complete, one-shot mode

184

ms

with averaging switched on.

One-shot mode with averaging off.

20

Maximum Series Resistance Cancelled Resistance split evenly on both the D+ and D– inputs.

50

W

Open−Drain Digital Outputs (THERM, ALERT/THERM2, SDA)

Output Low Voltage, VOL

High Level Output Leakage Current,

IOH

SMBus Interface (Note 3)

IOUT = −6.0 mA

VOUT = VDD

0.2

V

0.1

1.0

mA

Logic Input High Voltage, VIH

SCL, SDA

3.0 V ≤ VDD ≤ 3.6 V

2.1

V

Logic Input Low Voltage, VIL

SCL, SDA

3.0 V ≤ VDD ≤ 3.6 V

0.8

V

Hysteresis

500

mV

SDA Output Low Voltage, VOL

Logic Input Current, IIH, IIL

SMBus Input Capacitance,

SCLK, SDATA

IOUT = −6.0 mA

0.4

V

−1.0

+1.0

mA

10

pF

SMBus Clock Frequency

400

kHz

SMBus Timeout (Note 4)

User programmable

25

300

ms

SCLK Falling Edge to SDATA Valid

Time

Master clocking in data

1.0

ms

1. See Table 4 for information on other conversion rates.

2. Guaranteed by characterization, but not production tested.

3. See SMBus Timing Specifications section for more information.

4. Disabled by default. Detailed procedures to enable it are in the Serial Bus Interface section of this datasheet.

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