ADM1031 datasheet(2/32 Pages) AD

2 / 32 page

REV. 0

–2–

ADM1031–SPECIFICATIONS1 (T

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

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

POWER SUPPLY

Supply Voltage, VCC

3.0

3.30

5.5

Supply Current, ICC

1.4

Interface Inactive, ADC Active

µA

Standby Mode

TEMPERATURE-TO-DIGITAL CONVERTER

Local Sensor Accuracy

± 1

± 3

°C

Resolution

0.25

°C

Remote Diode1 Sensor Accuracy

±0.5

±1

°C60°C ≤ T

≤ 100°C

Remote Diode2 Sensor Accuracy

±0.5

±1.75

°C60°C ≤ T

≤ 100°C

Resolution

0.125

°C

Remote Sensor Source Current

180

µA

High Level

µA

Low Level

OPEN-DRAIN DIGITAL OUTPUTS

(

THERM, INT, FAN_FAULT, PWM_OUT)

Output Low Voltage, VOL

0.4

IOUT = –6.0 mA; VCC = 3 V

High-Level Output Leakage Current, IOH

0.1

µAV

OUT = VCC; VCC = 3 V

OPEN-DRAIN SERIAL DATA BUS OUTPUT (SDA)

Output Low Voltage, VOL

0.4

IOUT = –6.0 mA; VCC = 3 V

High-Level Output Leakage Current, IOH

0.1

µAV

OUT = VCC

SERIAL BUS DIGITAL INPUTS (SCL, SDA)

Input High Voltage, VIH

2.1

Input Low Voltage, VIL

0.8

Hysteresis

500

DIGITAL INPUT LOGIC LEVELS

(ADD,

THERM, TACH1/2)

Input High Voltage, VIH

2.1

Input Low Voltage, VIL

0.8

DIGITAL INPUT LEAKAGE CURRENT

Input High Current, IIH

–1

µAVIN = VCC

Input Low Current, IIL

µAV

IN = 0

Input Capacitance, CIN

5pF

FAN RPM-TO-DIGITAL CONVERTER

Accuracy

±6%

°C ≤ T

≤ 100°C

Full-Scale Count

255

TACH Nominal Input RPM

4400

RPM

Divisor N = 1, Fan Count = 153

2200

RPM

Divisor N = 2, Fan Count = 153

1100

RPM

Divisor N = 4, Fan Count = 153

550

RPM

Divisor N = 8, Fan Count = 153

Conversion Cycle Time

637

SERIAL BUS TIMING

Clock Frequency, fSCLK

100

kHz

See Figure 1

Glitch Immunity, tSW

See Figure 1

Bus Free Time, tBUF

4.7

µs

See Figure 1

Start Setup Time, tSU;STA

4.7

µs

See Figure 1

Start Hold Time, tHD;STA

µs

See Figure 1

Stop Condition Setup Time tSU;STO

µs

See Figure 1

SCL Low Time, tLOW

1.3

µs

See Figure 1

SCL High Time, tHIGH

450

µs

See Figure 1

SCL, SDA Rise Time, tR

1000

See Figure 1

SCL, SDA Fall Time, tF

300

See Figure 1

Data Setup Time, tSU;DAT

250

See Figure 1

Data Hold Time, tHD;DAT

300

See Figure 1

NOTES

1Typicals are at T

A = 25

°C and represent most likely parametric norm. Shutdown current typ is measured with V

CC = 3.3 V.

2ADD is a three-state input that may be pulled high, low or left open-circuit.

3Timing specifications are tested at logic levels of V

IL = 0.8 V for a falling edge and VIH = 2.2 V for a rising edge.

Specifications subject to change without notice.

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