ADM1033
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4
Table 4. ELECTRICAL CHARACTERISTICS (T
A
= T
MIN
to T
MAX
, V
CC
= V
MIN
to V
MAX
, unless otherwise noted.) (Note 1)
Parameter
Test Conditions/Comments Min Typ Max Unit
Power Supply
Supply Voltage, V
CC
(Note 2) 3.0 3.30 3.6 V
Supply Current, I
CC
Interface inactive, ADC Active − − 3.0 mA
Standby Mode − − 900
mA
Undervoltage Lockout Threshold − 2.5 − V
Power-On Reset Threshold 1.0 − 2.4 V
Temperature-to-Digital Converter
Internal Sensor Accuracy
20C T
A
60C
−40C T
A
+100C
−
−4.0
1.0
−
2.0
+2.0
C
Resolution − 0.03125 − C
External Diode Sensor Accuracy −40C T
D
+100C; T
A
= +40C
−40C T
D
+100C; +20C T
A
+60C
−40C T
D
+100C; −40C T
A
+100C
−
−
−3.0
0.5
1.0
−
1.0
1.25
+2.0
C
Resolution − 0.03125 − C
Remote Sensor Source Current High Level
Mid Level
Low Level
−
−
−
85
34
5.0
−
−
−
mA
Series Resistance Cancellation − − 1000
W
Power Supply Sensitivity − 1.0 − %/V
Conversion Time (Local Temperature) Averaging Enabled − 11 − ms
Conversion Time (Remote Temperature) Averaging Enabled − 32 − ms
Total Conversion Time Averaging Enabled − 43 − ms
Open-Drain Digital Outputs (ALERT, THERM, FAN_FAULT, DRIVE1, DRIVE2) (Note 3)
Output Low Voltage, V
OL
I
OUT
= −6.0 mA; V
CC
= +3.0 V − − 0.4 V
High Level Output Leakage Current, I
OH
V
OUT
= V
CC
; V
CC
= 3.0 V − 0.1 1.0
mA
Digital Input Leakage Current (TACH1, TACH2)
Input High Current, I
IH
−V
IN
= V
CC
−1.0 − −
mA
Input Low Current, I
IL
V
IN
= 0 − − 1.0
mA
Input Capacitance, C
IN
− 7.0 − pF
Digital Input Logic Levels (TACH1, TACH2)
Input High Voltage, V
IH
2.0 − 5.5 V
Input Low Voltage, V
IL
−0.3 − +0.8 V
Hysteresis − 500 − mV p−p
Open-Drain Serial Data Bus Output (SDA)
Output Low Voltage, V
OL
I
OUT
= −6.0 mA; V
CC
− − 0.4 V
High Level Output Leakage Current, I
OH
V
OUT
= V
CC
− 0.1 1.0
mA
Serial Bus Digital Inputs (SCL, SDA)
Input High Voltage, V
IH
2.1 − − V
Input Low Voltage, V
IL
− − 0.8 V
Hysteresis − 500 − mV
Analog Inputs (Location, REF)
Input Resistance
80 125 160
kW
Tachometer Accuracy
Fan Speed Measurement Accuracy
− − 4.0 %
