The following specifications apply for V+ = 3.0V to 3.6V, and all analog input source impedance R

Ω unless otherwise

specified in conditions. Boldface limits apply for T

Symbol

Parameter

Conditions

Typical

(Note 7)

Limits

(Note 8)

Units

(Limits)

Input Resistance, all analog inputs

210

140

k

Ω (min)

400

k

Ω (max)

DIGITAL OUTPUT: PWM1, PWM2, PWM3, XTESTOUT

I

OL

Logic Low Sink Current

LM85CIMQ

V

8

mA (min)

LM85BIMQ

V

8

mA (min)

V

OL

Logic Low Level

LM85CIMQ

I

0.4

V (max)

I

0.55

V (max)

LM85BIMQ

I

0.4

V (max)

SMBUS OPEN-DRAIN OUTPUT: SMBDAT

V

OL

Logic Low Output Voltage

I

0.4V

V (max)

I

OH

High Level Output Current

V

0.1

10

µA (max)

SMBUS INPUTS: SMBCLK. SMBDAT

V

IH

Logic Input High Voltage

2.1

V (min)

V

IL

Logic Input Low Voltage

0.8

V (max)

V

HYST

Logic Input Hysteresis Voltage

300

mV

DIGITAL INPUTS: ALL

V

IH

Logic Input High Voltage

2.1

V (min)

V

IL

Logic Input Low Voltage

0.8

V (max)

V

TH

Logic Input Threshold Voltage

1.5

V

I

IH

Logic High Input Current

V

0.005

10

µA (max)

I

IL

Logic Low Input Current

V

−0.005

−10

µA (max)

C

IN

Digital Input Capacitance

20

pF

AC Electrical Characteristics

The following specifications apply for V+ = 3.0V to 3.6V unless otherwise specified in conditions. Boldface limits apply for T

A

=T

Symbol

Parameter

Conditions

Typical

(Note 7)

Limits

(Note 8)

Units

(Limits)

TACHOMETER ACCURACY

Fan Count Accuracy

% (max)

Fan Full-Scale Count

65536

(max)

Fan Counter Clock Frequency

90

kHz

Fan Count Conversion Time

0.7

1.4

sec (max)

FAN PWM OUTPUT

Frequency Setting Accuracy

% (max)

Frequency Range

10

94

Hz

Hz

Duty-Cycle Range

0to100

% (max)

Duty-Cycle Resolution (8-bits)

0.390625

%

Spin-Up Time Interval Range

100

4000

ms ms

Spin-Up Time Interval Accuracy

% (max)

SPIKE SMOOTHING FILTER

Time Interval Deviation

% (max)

Time Interval Range

35

0.8

sec

sec

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