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ADT7301 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADT7301
Beschreibung 13-Bit/ 0.5C Accurate/ MicroPower Digital Temperature Sensor in 6-Lead SOT-23
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 14 Seiten
ADT7301 Datasheet, Funktion
13-Bit, ±0.5°C Accurate, MicroPower Digital
Temperature Sensor in 6-Lead SOT-23
Preliminary Technical Data
ADT7301
FEATURES
13-bit temperature-to-digital converter
−40°C to +150°C operating temperature range
±0.5°C typical accuracy
0.03125°C temperature resolution
Shutdown current of 1 µA
Power dissipation of 0.631 mW at VDD = 3.3 V
SPI- and DSP-compatible serial interface
Shutdown mode
Space-saving SOT-23 and MSOP packages
APPLICATIONS
Medical equipment
Automotive:
Environmental controls
Oil temperature
Hydraulic systems
Cell phones
Hard disk drives
Personal computers
Electronic test equipment
Office equipment
Domestic appliances
Process control
GENERAL DESCRIPTION
The ADT7301 is a complete temperature monitoring system
available in SOT-23 and MSOP packages. It contains a band gap
temperature sensor and a 13-bit ADC to monitor and digitize
the temperature reading to a resolution of 0.03125°C.
The ADT7301 has a flexible serial interface that allows easy
interfacing to most microcontrollers. The interface is compat-
ible with SPI®, QSPI™, and MICROWIRE™ protocols as well as
DSPs. The part features a standby mode that is controlled via
the serial interface. The ADT7301’s wide supply voltage range,
low supply current, and SPI compatible interface make it ideal
for a variety of applications, including personal computers,
office equipment, automotive, and domestic appliances. The
ADT7301 is rated for operation over the -40°C to +150°C
temperature range. It is not recommended to operate the device
at temperatures above +125°C for greater than a total of 5%
(5,000 hours) of the lifetime of the device. Any exposure
beyond this limit will affect device reliability.
Rev. PrJ
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or 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. Trademarks and
registered trademarks are the property of their respective owners.
FUNCTIONAL BLOCK DIAGRAM
GND
BAND GAP
TEMPERATURE
SENSOR
ADT7301
13-BIT
ANALOG/DIGITAL
CONVERTER
TEMPERATURE
VALUE
REGISTER
VDD
SERIAL
BUS
INTERFACE
CS
SCLK
DIN
DOUT
Figure 1. Functional Block Diagram
PRODUCT HIGHLIGHTS
1. The ADT7301 has an on-chip temperature sensor that
allows an accurate measurement of the ambient tempera-
ture. The measurable temperature range is −40°C to
+150°C.
2. Supply voltage of 2.7 V to 5.5 V.
3. Space-saving 6-lead SOT-23 and 8-lead MSOP packages.
4. Temperature accuracy of ±0.5°C.
5. 13-bit temperature reading to 0.03125°C resolution.
6. The ADT7301 features a shutdown mode that reduces the
power consumption to 4.88 µW with VDD = 3.3 V @ 1 SPS.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.






ADT7301 Datasheet, Funktion
ADT7301
Preliminary Technical Data
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
GND
DIN
VDD
16
ADT7301
2 TOP VIEW 5
(Not to Scale)
34
DOUT
CS
SCLK
NC 1
8 NC
ADT7301
DOUT 2
7 GND
TOP VIEW
(Not to Scale)
CS 3
6 DIN
Figure 4. SOT-23
SCLK 4
5 VDD
Figure 5. MSOP
Table 4. Pin Function Description
Mnemonic
GND
DIN
SOT-23
Pin No.
1
2
VDD
SCLK
3
4
CS 5
DOUT
6
Description
Analog and Digital Ground.
Serial Data Input. Serial data to be loaded to the part’s control register is provided on this input. Data is clocked
into the control register on the rising edge of SCLK.
Positive Supply Voltage, 2.7 V to 5.5 V.
Serial Clock Input. This is the clock input for the serial port. The serial clock is used to clock data out of the
ADT7301’s temperature value register and to clock data into the ADT7301’s control register.
Chip Select Input. Logic input. The device is selected when this input is low. The SCLK input is disabled when
this pin is high.
Serial Data Output. Logic output. Data is clocked out of the temperature value register at this pin. Data is
clocked out on the falling edge of SCLK.
Rev. PrJ | Page 6 of 14

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ADT7301 pdf, datenblatt
ADT7301
ADT7301 to ADSP-21xx Interface
Figure 17 shows an interface between the ADT7301 and the
ADSP-21xx DSP processor. To ensure correct operation of the
interface, the SPORT control register should be set up as
follows:
TFSW = RFSW = 1, alternate framing
INVRFS = INVTFS = 1, active low framing signal
DTYPE = 00, right justify data
SLEN = 1111, 16-bit data-words
ISCLK = 1, internal serial clock
TFSR = RFS = 1, frame every word
IRFS = 0, RFS configured as input
ITFS = 1, TFS configured as output
The interface requires an inverter between the SCLK line of the
ADSP-21xx and the SCLK input of the ADT7301. The ADSP-
21xx has the TFS and RFS of the SPORT tied together, with TFS
set as an output and RFS set as an input. The DSP operates in
alternate framing mode, and the SPORT control register is set
up as described previously.
ADT7301*
SCLK
DOUT
DIN
ADSP-21xx*
SCK
DR
DT
CS RFS
TFS
*ADDITIONAL PINS OMITTED FOR CLARITY
Figure 17. ADT7301 to ADSP-21 Interface
Preliminary Technical Data
MOUNTING THE ADT7301
The ADT7301 can be used for surface- or air-temperature
sensing applications. If the device is cemented to a surface with
thermally conductive adhesive, the die temperature will be
within about 0.1°C of the surface temperature, thanks to the
ADT7301’s low power consumption. Care should be taken to
insulate the back and leads of the device from the air if the
ambient air temperature is different from the surface tempera-
ture being measured.
The ground pin provides the best thermal path to the die, so the
temperature of the die will be close to that of the printed circuit
ground track. Care should be taken to ensure that this is in
good thermal contact with the surface being measured.
As with any IC, the ADT7301 and its associated wiring and
circuits must be kept free from moisture to prevent leakage and
corrosion, particularly in cold conditions where condensation is
more likely to occur. Water-resistant varnishes and conformal
coatings can be used for protection. The small size of the
ADT7301 allows it to be mounted inside sealed metal probes,
which provide a safe environment for the device.
SUPPLY DECOUPLING
The ADT7301 should be decoupled with a 0.1 µF ceramic
capacitor between VDD and GND. This is particularly important
if the ADT7301 is mounted remote from the power supply.
Rev. PrJ | Page 12 of 14

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