ADT7310TRZ Analog Devices Inc, ADT7310TRZ Datasheet

IC TEMP SENSOR 16BIT SPI 8SOIC

ADT7310TRZ

Manufacturer Part Number
ADT7310TRZ
Description
IC TEMP SENSOR 16BIT SPI 8SOIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of ADT7310TRZ

Function
Temp Monitoring System (Sensor)
Topology
ADC (Sigma Delta), Oscillator, Register Bank
Sensor Type
Internal
Sensing Temperature
-55°C ~ 150°C
Output Type
SPI™
Output Alarm
Yes
Output Fan
No
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-55°C ~ 150°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Ic Output Type
Digital
Sensing Accuracy Range
± 0.5°C
Supply Current
230µA
Supply Voltage Range
2.7V To 5.5V
Resolution (bits)
16bit
Sensor Case Style
SOIC
No. Of Pins
8
Temperature Sensor Function
Temp Sensor
Package Type
SOIC N
Operating Temperature (max)
150C
Operating Temperature Classification
Military
Operating Supply Voltage (min)
2.7V
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ADT7310TRZ
Manufacturer:
ADI
Quantity:
1
Part Number:
ADT7310TRZ-REEL7
Manufacturer:
AD
Quantity:
2 100
FEATURES
13- or 16-bit user selectable temperature-to-digital converter
Temperature accuracy ±0.5°C from −40°C to +105°C
No temperature calibration/correction required by user
Power saving 1 sample per second (SPS) mode
Fast first conversion on power-up of 6 ms
SPI-compatible interface
Operating temperature from −55°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: 7μW typical at 3.3 V
8-lead narrow SOIC RoHS-compliant package
APPLICATIONS
Medical equipment
Environmental control systems
Computer thermal monitoring
Thermal protection
Industrial process control
Power system monitors
Hand-held applications
Rev. 0
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.
DOUT
SCLK
DIN
CS
4
1
2
3
TEMPERATURE
REGISTER
REGISTER
REGISTER
VALUE
T
T
HYST
HIGH
CONFIGURATION
AND STATUS
REGISTERS
REGISTER
REGISTER
T
T
CRIT
LOW
FUNCTIONAL BLOCK DIAGRAM
TEMPERATURE
REFERENCE
INTERNAL
SENSOR
Figure 1.
Digital SPI Temperature Sensor
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The ADT7310 is a high accuracy digital temperature sensor
in a narrow SOIC 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 (Register Address 0x01).
The ADT7310 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
typically 210 μA. The ADT7310 has a shutdown mode that
powers down the device and offers a shutdown current of
typically 2 μA. The ADT7310 is rated for operation over the
−55°C to +150°C temperature range.
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.
OSCILLATOR
MODULATOR
INTERNAL
FILTER
LOGIC
Σ-Δ
±0.5°C Accurate, 16-Bit
T
T
T
©2009 Analog Devices, Inc. All rights reserved.
CRIT
HIGH
LOW
ADT7310
7
8
6
5
CT
INT
GND
V
ADT7310
DD
www.analog.com

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ADT7310TRZ Summary of contents

Page 1

FEATURES 13- or 16-bit user selectable temperature-to-digital converter Temperature accuracy ±0.5°C from −40°C to +105°C No temperature calibration/correction required by user Power saving 1 sample per second (SPS) mode Fast first conversion on power- SPI-compatible interface Operating ...

Page 2

ADT7310 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 SPI Timing Specifications ........................................................... 4 Absolute Maximum Ratings ............................................................ 5 ESD Caution .................................................................................. 5 ...

Page 3

SPECIFICATIONS T = −55°C to +150° 2 5.5 V; unless otherwise noted Table 1. Parameter Min TEMPERATURE SENSOR AND ADC 1 Accuracy ADC Resolution Temperature Resolution 13 Bit 16 Bit Temperature Conversion Time Fast ...

Page 4

ADT7310 SPI TIMING SPECIFICATIONS T = −55°C to +150° 2 5.5 V, unless otherwise noted. All input signals are specified with rise time ( (10 and timed from a ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 3. Parameter V to GND DD DIN Input Voltage to GND DOUT Voltage to GND SCLK Input Voltage to GND CS Input Voltage to GND CT and INT Output Voltage to GND ESD Rating (Human Body ...

Page 6

ADT7310 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 SCLK Serial Clock Input. The serial clock is used to clock in and clock out data to and from any register of the ADT7310. ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS 1.0 0.8 0.6 MAX ACCURACY LIMITS 0.4 0.2 0 –0.2 –0.4 –0.6 MAX ACCURACY LIMITS –0.8 –1.0 –60 –40 – TEMPERATURE (°C) Figure 6. Temperature Accuracy 1.0 0.8 MAX ACCURACY ...

Page 8

ADT7310 0.30 I CONTINUOUS CONVERSION DD 0.25 0.20 0.15 0.10 I 1SPS DD 0.05 0 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) Figure 10. Average Operating Supply Current vs. Supply Voltage at 25° ...

Page 9

THEORY OF OPERATION CIRCUIT INFORMATION The ADT7310 is a 13-bit digital temperature sensor that is extendable to 16-bits for greater resolution. An on-board temperature sensor generates a voltage proportional to absolute temperature, which is compared to an internal voltage reference ...

Page 10

ADT7310 CS 0x08 DIN DOUT SCLK Figure 14. Typical SPI One-Shot Write to Configuration Register Followed by a Read from the Temperature Value Register ONE-SHOT MODE Setting Bit and Bit the configuration register ...

Page 11

CT and INT Operation in One-Shot Mode See Figure 15 for more information on one-shot CT pin operation for T overtemperature events when one of the CRIT limits is exceeded. Note that in interrupt mode, a read from any register ...

Page 12

ADT7310 CONTINUOUS READ MODE When the command byte = 01010100 (0x54), the contents of the temperature value register can be read out without requiring repeated writes to the communications register. By sending 16 SCLK clocks to the ADT7310, the contents ...

Page 13

TEMPERATURE DATA FORMAT One LSB of the ADC corresponds to 0.0625°C in 13-bit mode. The ADC can theoretically measure a temperature range of 255°C, but the ADT7310 is guaranteed to measure a low value temperature limit of −55° ...

Page 14

ADT7310 REGISTERS The ADT7310 contains eight registers: • A status register • A configuration register • Five temperature registers • register The status register, temperature value register, and the ID register are read-only. Table 6. ADT7310 Registers Register ...

Page 15

CONFIGURATION REGISTER This 8-bit read/write register stores various configuration modes for the ADT7310, including shutdown, overtemperature and Table 8. Configuration Register (Register Address 0x01) Default Bit Value Type Name [0:1] 00 R/W Fault queue [2] 0 R/W CT pin polarity ...

Page 16

ADT7310 TEMPERATURE VALUE REGISTER The temperature value register stores the temperature measured by the internal temperature sensor. The temperature is stored as a 16-bit twos complement format. The temperature is read back from the temperature value register (Register Address 0x02) ...

Page 17

T SETPOINT REGISTER HYST The T setpoint 8-bit register (Register Address 0x05) stores HYST the temperature hysteresis value for the T temperature limits. The temperature hysteresis value is stored in straight binary format using four LSBs. Increments are possible in ...

Page 18

ADT7310 SERIAL INTERFACE The ADT7310 has a 4-wire serial peripheral interface (SPI). The interface has a data input pin (DIN) for inputting data to the device, a data output pin (DOUT) for reading data back from the device, and a ...

Page 19

WRITING DATA Data is written to the ADT7310 in eight bits or 16 bits, depending on the addressed register. The first byte written to the device is the command byte, with the read/write bit set to 0. The master then ...

Page 20

ADT7310 CS SCLK 8-BIT COMMAND BYTE 0 R/W REGISTER ADDR DIN DOUT READING DATA A read transaction begins when the master writes the command byte to the ADT7310 with the read/write ...

Page 21

INT AND CT OUTPUTS The INT and CT pins are open drain outputs, and both pins require a 10 kΩ pull-up resistor UNDERTEMPERATURE AND OVERTEMPERATURE DETECTION The INT and CT pins have two undertemperature/over- temperature modes: ...

Page 22

ADT7310 (COMPARATOR MODE) POLARITY = ACTIVE LOW (INTERRUPT MODE) POLARITY = ACTIVE LOW (COMPARATOR MODE) POLARITY = ACTIVE HIGH (INTERRUPT MODE) POLARITY = ACTIVE HIGH Figure 23. INT Output Temperature Response Diagram for T TEMPERATURE –13°C –14°C –15°C –16°C –17°C ...

Page 23

APPLICATIONS INFORMATION THERMAL RESPONSE TIME The time required for a temperature sensor to settle to a specified accuracy is a function of the thermal mass of the sensor and the thermal conductivity between the sensor and the object being sensed. ...

Page 24

... Model Temperature Range 2 ADT7310TRZ –55°C to +150°C 2 ADT7310TRZ-REEL –55°C to +150°C 2 ADT7310TRZ-REEL7 –55°C to +150°C 2 EVAL-ADT7310EBZ 1 Maximum accuracy over the −40°C to +105°C temperature range RoHS Compliant Part. ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners ...

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