NCT72
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4
Table 5. ELECTRICAL CHARACTERISTICS (T
A
= −40C to +125C, V
DD
= 2.8 V to 3.6 V, unless otherwise noted)
Parameter
Conditions Min Typ Max Unit
Power Supply
Supply Voltage, V
DD
2.8 3.30 3.6 V
Average Operating Supply Current, I
DD
0.0625 Conversions/Sec Rate (Note 1)
Standby Mode
−
−
240
5.0
350
30
mA
Undervoltage Lockout Threshold V
DD
Input, Disables ADC, Rising Edge − 2.55 − V
Power-on Reset Threshold 1.0 − 2.56 V
Temperature-to-digital Converter
Local Sensor Accuracy
3.0 V to 3.6 V
0C T
A
+70C
0C T
A
+85C
−
−
−
−
1.0
1.5
C
Local Sensor Accuracy
2.8 V to 3.6 V
−20C T
A
+110C
− − 2.5
C
Resolution − 1.0 − C
Remote Diode Sensor Accuracy
3.0 V to 3.6 V
0C T
A
+70C, −55C T
D
(Note 2) +150C
0C T
A
+85C, −55C T
D
(Note 2) +150C
−40C T
A
+100C, −55C T
D
(Note 2) +150C
−
−
−
−
−
−
1.0
1.5
2.5
C
Remote Diode Sensor Accuracy
2.8 V to 3.6 V
0C T
A
+70C, −20C T
D
+110C
−20C T
A
+110C, T
D
= +40C
−
−
−
−
1.5
2.25
C
Resolution − 0.25 − C
Remote Sensor Source Current High Level (Note 3)
Middle Level (Note 3)
Low Level (Note 3)
−
−
−
220
82
13.5
−
−
−
mA
Conversion Time
From Stop Bit to Conversion Complete, One-shot
Mode with Averaging Switched On
− 40 52 ms
One-shot Mode with Averaging Off
(That Is, Conversion Rate = 16-, 32-, or
64-conversions per Second)
− 6.0 8.0 ms
Maximum Series Resistance Cancelled Resistance split evenly on both the D+ and D– inputs − 1.5 −
kW
Open-drain Digital Outputs (THERM, ALERT/THERM2)
Output Low Voltage, V
OL
I
OUT
= −6.0 mA − − 0.4 V
High Level Output Leakage Current, I
OH
V
OUT
=V
DD
− 0.1 1.0
mA
SMBus/I
2
C Interface (Note 3 and 4)
Logic Input High Voltage, V
IH
SCLK, SDATA 1.4 − − V
Logic Input Low Voltage, V
IL
SCLK, SDATA − − 0.8 V
Hysteresis − 500 − mV
SDA Output Low Voltage, V
OL
I
OUT
= −6.0 mA − − 0.4 V
Logic Input Current, I
IH
, I
IL
−1.0 − +1.0
mA
SMBus Input Capacitance, SCLK, SDATA − 5.0 − pF
SMBus Clock Frequency − − 400 kHz
SMBus Timeout (Note 5) User Programmable − 25 64 ms
SCLK Falling Edge to SDATA Valid Time Master Clocking in Data − − 1.0
ms
1. See Table 9 for information on other conversion rates.
2. Guaranteed by characterization, but not production tested.
3. Guaranteed by design, but not production tested.
4. See SMBus/I
2
C Timing Specifications section for more information.
5. Disabled by default. Detailed procedures to enable it are in the Serial Bus Interface section of the datasheet.
