Rainbow Electronics LM85 - Manual (Page 5)

DC Electrical Characteristics
(Continued)
The following specifications apply for V+ = 3.0V to 3.6V, and all analog input source impedance R
S
= 50 Ω unless otherwise
specified in conditions. Boldface limits apply for T
A
= T
MIN
to T
MAX
; all other limits T
A
= 25˚C.
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
OL
=0.55V 8 mA (min)
LM85BIMQ V
OL
=0.4V 8 mA (min)
V
OL
Logic Low Level LM85CIMQ I
OUT
= +3 mA 0.4 V (max)
I
OUT
= +8 mA 0.55 V (max)
LM85BIMQ I
OUT
= +8 mA 0.4 V (max)
SMBUS OPEN-DRAIN OUTPUT: SMBDAT
V
OL
Logic Low Output Voltage I
OUT
= +4 mA 0.4V V (max)
I
OH
High Level Output Current V
OUT
= 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
IN
= V+ 0.005 10 µA (max)
I
IL
Logic Low Input Current V
IN
= GND −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
MIN
to T
MAX
; all other limits T
A
= 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
94
Hz
Hz
Duty-Cycle Range 0 to 100 % (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
sec
LM85
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