|
|
PDF ADT7420 Data sheet ( Hoja de datos )
| Número de pieza | ADT7420 | |
| Descripción | 16-Bit Digital I2C Temperature Sensor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ADT7420 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
|
No Preview Available !
Preliminary Technical Data
±0.25°C Accurate, 16-Bit Digitalwww.DataSheet4U.com
I2C Temperature Sensor
ADT7420
FEATURES
GENERAL DESCRIPTION
Temperature accuracy: ±0.25°C from −20°C to +105°C
13- or 16-bit user selectable temperature-to-digital converter
Low drift silicon temperature sensor
No temperature calibration/correction required by user
Power saving 1 sample per second (SPS) mode
Fast first conversion on power-up of 6 ms
I2C-compatible interface
Operating temperature: −40°C to +150°C
Operating voltage: 2.7 V to 5.5 V
Critical overtemperature indicator
Programmable overtemperature/undertemperature interrupt
Low power consumption: 700 µW typical at 3.3 V
Shutdown mode for lower power: 7 µW typical at 3.3 V
16-lead RoHS-compliant LFCSP package
APPLICATIONS
RTD and thermistor replacement
Medical equipment
Cold junction compensation
Industrial control and test
Food transportation and storage
Environmental monitoring and HVAC
The ADT7420 is a high accuracy digital temperature sensor
offering breakthrough performance over a wide industrial
range, housed in an LFCSP package. It contains a band gap
temperature reference and a 13-bit ADC to monitor and digitize
the temperature to a 0.0625°C resolution. The ADC resolution,
by default, is set to 13 bits (0.0625°C). This can be changed to
16 bits (0.0078°C) by setting Bit 7 in the configuration register
to 1 (Register Address 0x03).
The ADT7420 is guaranteed to operate over supply voltages from
2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is typi-
cally 210 μA. The ADT7420 has a shutdown mode that powers
down the device and offers a shutdown current of typically 2 μA.
The ADT7420 is rated for operation over the −40°C to +150°C
temperature range.
Pin A0 and Pin A1 are available for address selection, giving the
ADT7420 four possible I2C addresses. The CT pin is an open-
drain output that becomes active when the temperature exceeds
a programmable critical temperature limit. The default critical
temperature limit is 147°C. The INT pin is also an open-drain
output that becomes active when the temperature exceeds a
programmable limit. The INT and CT pins can operate in either
comparator or interrupt mode.
FUNCTIONAL BLOCK DIAGRAM
VDD
12
TEMPERATURE
VALUE
REGISTER
ADT7420
CONFIGURATION
REGISTER
TCRIT
REGISTER
INTERNAL
OSCILLATOR
TCRIT
10 CT
THIGH
REGISTER
TLOW
REGISTER
THYST
REGISTER
STATUS
REGISTER
INTERNAL
REFERENCE
TEMPERATURE
SENSOR
Σ-Δ
MODULATOR
THIGH
9 INT
ID
REGISTER
SOFTWARE
RESET
REGISTER
POINTER
REGISTER
FILTER
LOGIC
TLOW
A0 3
A1 4
I2C INTERFACE
11
GND
Figure 1.
1 SCL
2 SDA
Rev. PrA
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.
1 page  
Preliminary Technical Data
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
VDD to GND
SDA Voltage to GND
SCL Output Voltage to GND
A0 Input Voltage to GND
A1 Input Voltage to GND
CT and INT Output Voltage to GND
ESD Rating (Human Body Model)
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature, TJMAX
16-Lead LFCSP (CP-16-17)
Power Dissipation1
Thermal Impedance3
θJA, Junction-to-Ambient (Still Air)
θJC, Junction-to-Case
IR Reflow Soldering
Peak Temperature (RoHS-Compliant
Package)
Time at Peak Temperature
Ramp-Up Rate
Ramp-Down Rate
Time from 25°C to Peak Temperature
Rating
−0.3 V to +7 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
2.0 kV
−40°C to +150°C
−65°C to +160°C
150°C
WMAX = (TJMAX − TA2)/θJA
121°C/W
56°C/W
220°C
260°C (0°C)
20 sec to 40 sec
3°C/sec maximum
−6°C/sec maximum
8 minutes maximum
1 Values relate to package being used on a standard 2-layer PCB. This gives a
worst-case θJA and θJC.
2 TA = ambient temperature.
3 Junction-to-case resistance is applicable to components featuring a
preferential flow direction, for example, components mounted on a heat
sink. Junction-to-ambient is more useful for air-cooled, PCB-mounted
components.
ADT7420www.DataSheet4U.com
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. PrA | Page 5 of
5 Page 
Preliminary Technical Data
SHUTDOWN
The ADT7420 can be placed in shutdown mode by writing 1
to Bit 5 and 1 to Bit 6 of the configuration register (Register
Address 0x03), in which case the entire IC is shut down and
no further conversions are initiated until the ADT7420 is
taken out of shutdown mode. The ADT7420 can be taken
out of shutdown mode by writing 0 to Bit 5 and 0 to Bit 6 in
the configuration register (Register Address 0x03). The
ADT7420 typically takes 1 ms (with a 0.1 µF decoupling
capacitor) to come out of shutdown mode. The conversion
result from the last conversion prior to shutdown can still be
read from the ADT7420 even when it is in shutdown mode.
When the part is taken out of shutdown mode, the internal
clock is started and a conversion is initiated.
ADT7420www.DataSheet4U.com
FAULT QUEUE
Bit 0 and Bit 1 of the configuration register (Register Address
0x03) are used to set up a fault queue. The queue can facilitate up
to four fault events to prevent false tripping of the INT and CT pins
when the ADT7420 is used in a noisy temperature environment.
The number of faults set in the queue must occur consecutively
to set the INT and CT outputs. For example, if the number of
faults set in the queue is four, then four consecutive temperature
conversions must occur with each result exceeding a temperature
limit in any of the limit registers before the INT and CT pins are
activated. If two consecutive temperature conversions exceed a
temperature limit and the third conversion does not, the fault
count is reset back to zero.
Rev. PrA | Page 11 of
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADT7420.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ADT7420 | 16-Bit Digital I2C Temperature Sensor | Analog Devices |
| ADT7421 | Temperature Sensor W/ Beta Correction |  ON Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |