ADT7481 Просмотр технического описания (PDF) - Analog Devices

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ADT7481

Dual Channel Temperature Sensor and Over Temperature Alarm

Analog Devices 

ADT7481

SPECIFICATIONS

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

Table 1.

Parameter

POWER SUPPLY

Supply Voltage, VDD

Average Operating Supply Current, IDD

Undervoltage Lockout Threshold

Power-On-Reset Threshold

TEMPERATURE-TO-DIGITAL CONVERTER

Local Sensor Accuracy2

Resolution

Remote Diode Sensor Accuracy2

Resolution

Remote Sensor Source Current

Min Typ Max Unit

3.0 3.30 3.6 V

240 350 μA

5 30 μA

2.55

V

1

2.5 V

±1 °C

±1.5

±2.5 °C

1

°C

±1 °C

±1.5 °C

±2.5 °C

0.25

°C

233

μA

14

μA

Conversion Time

73 94 ms

11 14 ms

OPEN-DRAIN DIGITAL OUTPUTS: THERM,

ALERT/THERM2

Output Low Voltage, VOL

High Level Output Leakage Current, IOH

SMBus INTERFACE4, 5

0.4 V

0.1 1

μA

Logic Input High Voltage, VIH

2.1

V

SCLK, SDATA

Logic Input Low Voltage, VIL

SCLK, SDATA

0.8 V

Hysteresis

500

mV

SDA Output Low Voltage, VOL

Logic Input Current, IIH, IIL

−1

SMBus Input Capacitance, SCLK, SDATA

5

0.4 V

+1 μA

pF

SMBus Clock Frequency

SMBus Timeout6

400 kHz

25 32 ms

SCLK Falling Edge to SDATA Valid Time

1

μs

Test Conditions

0.0625 conversions/sec rate1

Standby mode

VDD input, disables ADC, rising edge

0°C ≤ TA ≤ +70°C

0°C ≤ TA ≤ +85°C

−40 ≤ TA ≤ +100°C

0°C ≤ TA ≤ +70°C, −55°C ≤ TD3≤ +150°C

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

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

High level4

Low level4

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)

IOUT = −6.0 mA

VOUT = VDD

IOUT = −6.0 mA

User programmable

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.

Rev. 0 | Page 3 of 24

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