ADT7461A
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS T
A
= −40°C to +125°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)
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 − 2.5 V
Temperature−To−Digital Converter
Local Sensor Accuracy
0°C ≤ T
A
≤ +70°C
0°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +100°C
− − ±1.0
±1.5
±2.5
°C
Resolution − 1.0 − °C
Remote Diode Sensor Accuracy 0°C ≤ T
A
≤ +70°C, −55°C ≤ T
D
(Note 2) ≤ +150°C
0°C ≤ T
A
≤ +85°C, −55°C ≤ T
D
(Note 2) ≤ +150°C
−40°C ≤ T
A
≤ +100°C, −55°C ≤ T
D
(Note 2) ≤ +150°C
− − ±1.0
±1.5
±2.5
°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 Interface (Note 3 and 4)
Logic Input High Voltage, V
IH
SCLK, SDATA 3.0 V ≤ V
DD
≤ 3.6 V 2.1 − − V
Logic Input Low Voltage, V
IL
SCLK, SDATA 3.0 V ≤ V
DD
≤ 3.6 V − − 0.8 V
Hysteresis − 500 − mV
SDA Output Low Voltage, V
OL
− − 0.4 mA
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 5 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 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.
