Datasheet

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ELECTRICAL CHARACTERISTICS
AMC6821
SBAS386C – MAY 2006 – REVISED JULY 2007
At T
A
= – 40 ° C to +100 ° C and V
DD
= +3V or +5V, unless otherwise noted.
AMC6821
PARAMETER CONDITIONS MIN TYP MAX UNIT
TEMPERATURE MEASUREMENT
T
A
= 0 ° C to +90 ° C ± 0.5 ± 2.0 ° C
Local sensor accuracy
T
A
= – 25 ° C to +100 ° C ± 1.0 ± 3.0 ° C
T
R
= +50 ° C to +100 ° C ± 0.5 ± 2.0 ° C
Remote sensor accuracy
(1)
T
R
= – 40 ° C to +125 ° C ± 1.0 ± 3.0 ° C
Sensor resolution Both channels 0.125 ° C
Conversion time Two channels 62.5 ms
PWM CONTROLLER
PWM frequency range (programmable) 10 40k Hz
PWM frequency accuracy +25 ° C to +100 ° C – 6 +7 %
Duty cycle Programmable 0 100 %
Duty cycle resolution 8-bit 0.39 %/bit
FAN RPM-TO-DIGITAL CONVERTER
Accuracy +25 ° C to +100 ° C – 6 +7 %
Full-scale count 65535
Nominal input RPM 100 23000 RPM
Internal clock frequency for RPM measurement 100 kHz
DIGITAL INPUT/OUTPUT
V
OL
Open-drain output low voltage Sink current 6 mA, V
DD
= +3V 0 0.4 V
I
OH
Open-drain high-level output leakage current 0.1 1 µ A
V
IH
Input high voltage 2.1 V
V
IL
Input low voltage 0.8 V
I
IH
Input high current – 1 µ A
I
IL
Input low current 1 µ A
Input capacitance 5 pF
POWER SUPPLY
Operating V
DD
Range 2.7 5 5.5 V
Specified V
DD
Range 3 5 V
Current V
DD
= 5 1.1 2.0 mA
Power dissipation 5 mW
Operating temperature – 40 +125 ° C
Storage temperature – 65 +150 ° C
(1) The remote temperature sensor is optimized for the Pentium M™ thermal diode with diode ideality n = 1.0022, and T
A
= 0 ° C to +100 ° C.
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