ADT7481
http://onsemi.com
4
Table 5. ELECTRICAL CHARACTERISTICS (T
A
= −40°C to +120°C, V
DD
= 3.0 V to 3.6 V, unless otherwise noted)
Parameter
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) − 3.0 4.0 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 (Note 2)
0°C ≤ T
A
≤ +70°C
0°C ≤ T
A
≤ +85°C
−40 ≤ T
A
≤ +100°C
−
−
−
−
−
−
±1
±1.5
±2.5
°C
Resolution − 1.0 − °C
Remote Diode Sensor Accuracy (Note 2) 0°C ≤ T
A
≤ +70°C, −55°C ≤ T
D
(Note 3) ≤ +150°C
0°C ≤ T
A
≤ +85°C, −55°C ≤ T
D
(Note 3) ≤ +150°C
−40°C ≤ T
A
≤ +100°C, −55°C ≤ T
D
(Note 3) ≤ +150°C
−
−
−
−
−
−
±1
±1.5
±2.5
°C
Resolution − 0.25 − °C
Remote Sensor Source Current
High Level (Note 4) − 233 −
mA
Low Level (Note 4) − 14 −
mA
Conversion Time
From Stop Bit to Conversion Complete (Both
Channels) One-shot Mode with Averaging
Switched On
− 73 94 ms
One-shot Mode with Averaging Off
(Conversion Rate = 16, 32, or 64 Conversions
per Second)
− 11 14 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 (Notes 4 and 5)
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 6) User Programmable − 25 32 ms
SCLK Falling Edge to SDATA Valid Time Master Clocking in Data − − 1.0
ms
1. See Table 11 for information on other conversion rates.
2. Averaging enabled.
3. Guaranteed by characterization, not production tested.
4. Guaranteed by design, not production tested.
5. See Timing Specifications section for more information.
6. Disabled by default. See the Serial Bus Interface section for details to enable it.
