Datasheet

Data Sheet ADT7420
Rev. 0 | Page 3 of 24
SPECIFICATIONS
T
A
= −40°C to +125°C, V
DD
= 2.7 V to 5.5 V, unless otherwise noted.
Table 1.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
TEMPERATURE SENSOR AND ADC
Accuracy
1
0.0017 ±0.20
2
°C T
A
= −10°C to +85°C, V
DD
= 3.0 V
±0.25 °C T
A
= −20°C to +105°C, V
DD
= 2.7 V to 3.3 V
±0.31 °C T
A
= −40°C to +105°C, V
DD
= 3.0 V
±0.35 °C T
A
= −40°C to +105°C, V
DD
= 2.7 V to 3.3 V
±0.50 °C T
A
= −40°C to +125°C, V
DD
= 2.7 V to 3.3 V
±0.50
3
°C
T
A
= −10°C to +105°C, V
DD
= 4.5 V to 5.5 V
±0.66 °C T
A
= −40°C to +125°C, V
DD
= 4.5 V to 5.5 V
−0.85 °C T
A
= +150°C, V
DD
= 4.5 V to 5.5 V
−1.0 °C T
A
= +150°C, V
DD
= 2.7 V to 3.3 V
ADC Resolution 13 Bits Twos complement temperature value of the
sign bit plus 12 ADC bits (power-up default
resolution)
16 Bits Twos complement temperature value of the
sign bit plus 15 ADC bits (Bit 7 = 1 in the
configuration register)
Temperature Resolution
13-Bit 0.0625 °C 13-bit resolution (sign + 12-bit)
16-Bit 0.0078 °C 16-bit resolution (sign + 15-bit)
Temperature Conversion Time 240 ms Continuous conversion and one-shot
conversion modes
Fast Temperature Conversion Time 6 ms First conversion on power-up only
1 SPS Conversion Time 60 ms Conversion time for 1 SPS mode
Temperature Hysteresis
4
±0.002 °C Temperature cycle = 25°C to 125°C and back
to 25°C
Repeatability
5
±0.015 °C T
A
= 25°C
Drift
6
0.0073 °C 500 hour stress test at +150°C with V
DD
= 5.0 V
DC PSRR 0.1 °C/V T
A
= 25°C
DIGITAL OUTPUTS (CT, INT, SDA—OPEN DRAIN)
High Output Leakage Current, I
OH
0.1 5 µA CT and INT pins pulled up to 5.5 V
Output Low Voltage, V
OL
0.4 V I
OL
= 3 mA at 5.5 V, I
OL
= 1 mA at 3.3 V
Output High Voltage, V
OH
0.7 × V
DD
V
Output Capacitance, C
OUT
2
pF
DIGITAL INPUTS (SCL, SDA, A0, A1)
Input Current ±1 µA V
IN
= 0 V to V
DD
Input Low Voltage, V
IL
0.3 × V
DD
V SCL and SDA only
0.4 V A0 and A1 only
Input High Voltage, V
IH
0.7 × V
DD
V SCL and SDA only
2 V A0 and A1 only
SCL, SDA Glitch Rejection 50 ns Input filtering suppresses noise spikes of less
than 50 ns
Pin Capacitance 2 10 pF
POWER REQUIREMENTS
Supply Voltage 2.7 5.5 V
Supply Current
At 3.3 V 210 265 µA Peak current while converting, I
2
C interface
inactive
At 5.5 V 250 300 µA Peak current while converting, I
2
C interface
inactive
1 SPS Current
At 3.3 V
46
µA
V
DD
= 3.3 V, 1 SPS mode, T
A
= 25°C
At 5.5 V 65 µA V
DD
= 5.5 V, 1 SPS mode, T
A
= 25°C