Rainbow-electronics LM85 Manual de usuario descargar pdf (Pagina 5)

DC Electrical Characteristics (Continued)

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

=50Ω unless otherwise

specified in conditions. Boldface limits apply for T

MIN

to T

MAX

; all other limits T

= 25˚C.

Symbol Parameter Conditions Typical

(Note 7)

Limits

(Note 8)

Units

(Limits)

Input Resistance, all analog inputs 210 140 kΩ (min)

400 kΩ (max)

DIGITAL OUTPUT: PWM1, PWM2, PWM3, XTESTOUT

Logic Low Sink Current LM85CIMQ V

=0.55V 8 mA (min)

LM85BIMQ V

=0.4V 8 mA (min)

Logic Low Level LM85CIMQ I

OUT

=+3mA 0.4 V (max)

OUT

=+8mA 0.55 V (max)

LM85BIMQ I

OUT

=+8mA 0.4 V (max)

SMBUS OPEN-DRAIN OUTPUT: SMBDAT

Logic Low Output Voltage I

OUT

=+4mA 0.4V V (max)

High Level Output Current V

OUT

= V+ 0.1 10 µA (max)

SMBUS INPUTS: SMBCLK. SMBDAT

Logic Input High Voltage 2.1 V (min)

Logic Input Low Voltage 0.8 V (max)

HYST

Logic Input Hysteresis Voltage 300 mV

DIGITAL INPUTS: ALL

Logic Input High Voltage 2.1 V (min)

Logic Input Low Voltage 0.8 V (max)

Logic Input Threshold Voltage 1.5 V

Logic High Input Current V

= V+ 0.005 10 µA (max)

Logic Low Input Current V

= GND −0.005 −10 µA (max)

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

MIN

to T

MAX

; all other limits T

= 25˚C.

Symbol Parameter Conditions Typical

(Note 7)

Limits

(Note 8)

Units

(Limits)

TACHOMETER ACCURACY

Fan Count Accuracy

10 % (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

10 % (max)

Frequency Range 10

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

10 % (max)

SPIKE SMOOTHING FILTER

Time Interval Deviation

10 % (max)

Time Interval Range 35

0.8

sec

LM85

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Rainbow-electronics LM85 Manual de usuario Pagina 5

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