ADM1028 datasheet(2/16 Pages) AD

2 / 16 page

REV. A

–2–

ADM1028–SPECIFICATIONS1, 2 (T

A = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted.)

Parameter

Min

Typ

Max

Unit

Test Conditions

POWER SUPPLY

Supply Voltage, VCC

3.0

3.30

5.5

Supply Current, ICC

3.2

Interface Inactive, ADC Active

TEMPERATURE-TO-DIGITAL CONVERTER

Internal Sensor Accuracy

±3

°C

±2

°C60°C ≤ TA ≤ 100°C

Resolution

°C

External Diode Sensor Accuracy

±5

°C

±3

°C60°C ≤ TA ≤ 100°C

Resolution

°C

Remote Sensor Source Current

120

µA

High Level (D+ = D– + 0.65 V)

µA

Low Level (D+ = D– + 0.65 V)

ANALOG OUTPUT

Output Voltage Range

2.5

Total Unadjusted Error, TUE

±3%

IL = 2 mA

Full-Scale Error

±1

±3%

Zero Error

±2

LSB

No Load

Differential Nonlinearity, DNL

±1

LSB

Monotonic by Design

Integral Nonlinearity

±1

LSB

Output Source Current

Output Sink Current

THERMA OUTPUT

THERMA Pull-Up Resistance

Ω

DIGITAL OUTPUT

THERMA/NTEST_OUT,

R_OFF

Output High Voltage, VOH

2.4

IOUT = 3.0 mA

Output Low Voltage, VOL

0.4

OPEN-DRAIN DIGITAL OUTPUTS

(INT,

THERMB, FAN_OFF, R_RST)

Output Low Voltage, VOL

0.4

IOUT = –3.0 mA

High Level Output Leakage Current, IOH

0.1

µAVOUT = VCC3

FAN SPEED RAMP RATES

Counter Frequency

± 50%

OPEN-DRAIN SERIAL DATA

BUS OUTPUT (SDA)

Output Low Voltage, VOL

0.4

IOUT = –3.0 mA

High Level Output Leakage Current, IOH

0.1

µAVOUT = VCC

SERIAL BUS DIGITAL INPUTS

(SCL, SDA)

Input High Voltage, VIH

2.1

Input Low Voltage, VIL

0.8

Input Leakage Current

±5

µA

Hysteresis

500

Note 4

DIGITAL INPUT LOGIC LEVELS

(FAN_SPD/TEST_IN, GPI)

Input High Voltage, VIH

2.2

Input Low Voltage, VIL

0.8

DIGITAL INPUT LEAKAGE CURRENT

(ALL DIGITAL INPUTS)

Input High Current, IIH

–1

–0.005

µAV

IN = VCC

Input Low Current, IIL

+0.005

µAVIN = 0

Input Capacitance, CIN

Note 4

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