ADT7490
Table 3. ELECTRICAL CHARACTERISTICS (continued)
(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
Analog-to-Digital Converter (Including MUX and Attentuators)
Total Unadjusted Error (TUE)
Differential Non-linearity (DNL)
Power Supply Sensitivity
For All Channels: ? 40 ? C ? T A ? +125 ? C
For All Other Channels Except +12 V IN :
0 ? C ? T A ? +125 ? C
8 Bits
?
?
?
?
?
?
?
? 0.1
? 2
? 1.5
? 1
?
%
LSB
%/V
Conversion Times (Note 2)
Averaging Enabled, All Channels
Excluding V TT (Note 3)
ms
Voltage Inputs
V TT Voltage Input (Note 3)
Local Temperature
Remote Temperature
Averaging Enabled
Averaging Enabled
Averaging Enabled
Averaging Enabled
?
?
?
?
11
12
12
38
13
14
14
43
Total Monitoring Cycle Time
Input Resistance
Averaging disabled
For +12 V IN Channel
For All Other Channels
?
?
150
70
169
19
200
100
193
?
?
?
ms
k W
Fan RPM-to-Digital Converter
Accuracy
Full-scale Count
Nominal Input RPM
0 ? C ? T A ? 85 ? C
? 40 ? C ? T A ? +125 ? C
Fan Count = 0xBFFF
Fan Count = 0x3FFF
Fan Count = 0x0438
Fan Count = 0x021C
?
?
?
?
?
?
?
?
?
?
109
329
5,000
10,000
? 10
? 14
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
SMBus Digital Inputs (SCL, SDA)
Input High Voltage, V IH
Input Low Voltage, V IL
Hysteresis
2.0
?
?
?
?
500
?
0.8
?
V
V
mV
Digital I/O (PECI Pin) (Note 2)
V TT , Supply Voltage
Input High Voltage, V IH
Input Low Voltage, V IL
0.95
0.55 ? V TT
(Note 3)
?
?
?
?
1.26
?
0.5 ? V TT
(Note 3)
V
V
V
Hysteresis (Note 2)
High Level Output Source Current,
I SOURCE
Low Level Output Sink Current, I SINK
Signal Noise Immunity, V NOISE
Hysteresis between Input Switching
Levels
V OH = 0.75 ? V TT
V OL = 0.25 ? V TT
Noise Glitches from 10 MHz to
100 MHz, Width Up to 50 ns
0.1 ? V TT
(Note 3)
?
0.5
300
?
?
?
?
?
6.0
1.0
?
mV
mA
mA
mV
p-p
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