ADT7473
Table 4. ELECTRICAL CHARACTERISTICS (T A = T MIN to T MAX , V CC = V MIN to V MAX , unless otherwise noted.) (Note 1)
Parameter
Conditions
Min
Typ
Max
Unit
Power Supply
Supply Voltage
3.0
3.3
3.6
V
Supply Current, I CC
Interface Inactive, ADC Active
?
1.5
3.0
mA
Temperature-to-Digital Converter
Local Sensor Accuracy
Resolution
Remote Diode Sensor Accuracy
Resolution
Remote Sensor Source Current
0 ? C ? T A ? 85 ? C
? 40 ? C ? T A ? +125 ? C
0 ? C ? T A ? 85 ? C
? 40 ? C ? T A ? +125 ? C
First Current
Second Current
Third Current
?
?
?
?
?
?
?
?
?
? 0.5
?
0.25
? 0.5
?
0.25
6
36
96
? 1.5
? 2.5
?
? 1.5
? 2.5
?
?
?
?
? C
? C
m A
Analog-to-Digital Converter (Including MUX and Attentuators)
Total Unadjusted Error (TUE)
?
?
? 1.5
%
Differential Nonlinearity (DNL)
Power Supply Sensitivity
Conversion Time (Voltage Input)
Conversion Time (Local Temperature)
Conversion Time (Remote Temperature)
Total Monitoring Cycle Time
Input Resistance
8 Bits
Averaging Enabled
Averaging Enabled
Averaging Enabled
Averaging Enabled
Averaging Disabled
For V CCP Channel
?
?
?
?
?
?
?
70
?
? 0.1
11
12
38
145
19
120
? 1.0
?
?
?
?
?
?
?
LSB
%/V
ms
ms
ms
ms
k W
Fan RPM-to-Digital Converter
Accuracy
Full-scale Count
Nominal Input RPM
0 ? C ? T A ? 70 ? C
? 40 ? C ? T A ? +120 ? C
Fan Count = 0xBFFF
Fan Count = 0x3FFF
Fan Count = 0x0438
Fan Count = 0x021C
?
?
?
?
?
?
?
?
?
?
109
329
5,000
10,000
? 6.0
? 10
65,535
?
?
?
?
%
RPM
Open-Drain Digital Outputs, PWM1 to PWM3, XTO
Current Sink, I OL
?
?
8.0
mA
Output Low Voltage, V OL
High Level Output Current, I OH
I OUT = ? 8.0 mA
V OUT = V CC
?
?
?
0.1
0.4
20
V
m A
Open-Drain Serial Data Bus Output (SDA)
Output Low Voltage, V OL
High Level Output Current, I OH
I OUT = ? 4.0 mA
V OUT = V CC
?
?
?
0.1
0.4
1.0
V
m A
Digital Output Logic Levels, ADT7473 ? 1 (THERM_LATCH) ADTL+
Output High Voltage, V OH
Output Low Voltage, V OL
0.75 ? V CC
?
?
?
?
0.4
V
V
SMBus Digital Inputs (SCL, SDA)
Input High Voltage, V IH
Input Low Voltage, V IL
Hysteresis
2.0
?
?
?
?
500
?
0.4
?
V
V
mV
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