ADT7482
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4
Table 5. ELECTRICAL CHARACTERISTICS (T
A
= −40C to +120C, V
DD
= 3.0 V to 3.6 V, unless otherwise noted.)
Parameter
Test Conditions Min Typ Max Unit
Power Supply
Supply Voltage, V
DD
3.0 3.30 3.6 V
Average Operating Supply Current, I
DD
0.0625 Conversions/Sec Rate (Note 1) − 240 350
mA
Standby Mode − 5.0 30
mA
Undervoltage Lockout Threshold V
DD
Input, Disables ADC, Rising Edge − 2.55 − V
Power-On Reset Threshold 1.0 − 2.5 V
Temperature-to-Digital Converter
Local Sensor Accuracy
0C T
A
+70C
0C T
A
+85C
−40C T
A
+100C
−
−
−
−
−
−
1.0
1.5
2.5
C
Resolution − 1.0 − C
Remote Diode Sensor Accuracy (Note 2) 0C T
A
+70C, −55C T
D
+150C
0C T
A
+85C, −55C T
D
+150C
−40C T
A
+100C, −55C T
D
+150C
−
−
−
−
−
−
1.0
1.5
2.5
C
Resolution − 0.25 − C
Remote Sensor Source Current High Level (Note 3)
Mid Level (Note 3)
Low Level (Note 2)
−
−
−
220
82
13.5
−
−
−
mA
Maximum Series Resistance Cancelled Resistance Split Evenly on D+ and D− Lines − 1.5 −
kW
Conversion Time
From Stop Bit to Conversion Complete
(All Channels) One-shot Mode with
Averaging Switched On
− 71 93 ms
One-shot Mode with Averaging Off
(Conversion Rate = 16, 32, or 64
Conversions per Second)
− 11.5 15 ms
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 Interface (Note 3 and 4)
Logic Input High Voltage, V
IH
SCLK, SDATA 2.1 − − 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 11 for conversion rates.
2. Guaranteed by characterization, but not production tested.
3. Guaranteed by design, but not production tested.
4. See the Timing Specifications section for more information.
5. Disabled by default. For details on enabling the SMBus, see the Serial Bus Interface section.
