AD7415 Temperature Sensors Datasheet

AD7415 Datasheet, PDF, Equivalent


Part Number

AD7415

Description

10-Bit Digital Temperature Sensors

Manufacture

Analog Devices

Total Page 20 Pages
Datasheet
Download AD7415 Datasheet


AD7415
FEATURES
10-bit temperature-to-digital converter
Temperature range: −40°C to +125°C
Typical accuracy of ±0.5°C at +40°C
SMBus/I2C®-compatible serial interface
3 μA power-down current
Temperature conversion time: 29 μs typ
Space-saving 6-lead (AD7414) and 5-lead (AD7415)
SOT-23 packages
Pin selectable addressing via AS
Overtemperature indicator (AD7414 Only)
SMBus alert function (AD7414 only)
4 versions allow 8 I2C addresses (AD7414)
2 versions allow 6 I2C addresses (AD7415)
APPLICATIONS
Hard disk drives
Personal computers
Electronic test equipment
Office equipment
Domestic appliances
Process control
Cellular phones
GENERAL DESCRIPTION
The AD7414/AD7415 are complete temperature monitoring
systems in 6-lead and 5-lead SOT-23 packages. They contain a
band gap temperature sensor and a 10-bit ADC to monitor and
digitize the temperature reading to a resolution of 0.25°C.
The AD7414/AD7415 provide a 2-wire serial interface that is
compatible with SMBus and I2C interfaces. The parts come in four
versions: the AD7414/AD7415-0, AD7414/AD7415-1, AD7414-2,
and AD7414-3. The AD7414/AD7415-0 and AD7414/AD7415-1
versions provide a choice of three different SMBus addresses for
each version. All four AD7414 versions give the possibility of eight
different I2C addresses while the two AD7415 versions allow up to
six I2C addresses to be used.
The AD7414/AD7415’s 2.7 V supply voltage, low supply current,
serial interface, and small package size make them ideal for a
variety of applications, including personal computers, office
equipment, cellular phones, and domestic appliances.
In the AD7414, on-chip registers can be programmed with high
and low temperature limits, and an open-drain overtemperature
indicator output (ALERT) becomes active when a programmed
Rev. F
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.
±0.5°C Accurate, 10-Bit Digital
Temperature Sensors in SOT-23
AD7414/AD7415
FUNCTIONAL BLOCK DIAGRAM
GND
BAND GAP
TEMPERATURE
SENSOR
CONFIGURATION
REGISTER
THIGH SETPOINT
REGISTER
TLOW SETPOINT
REGISTER
10-BIT
ANALOG-DIGITAL
CONVERTER
TEMPERATURE
VALUE
REGISTER
SETPOINT
COMPARATOR
VDD
ALERT
AS
GND
AD7414
SMBus/I2C
INTERFACE
AD7415
BAND GAP
TEMPERATURE
SENSOR
10-BIT
ANALOG-DIGITAL
CONVERTER
SCL
SDA
VDD
CONFIGURATION
REGISTER
TEMPERATURE
VALUE
REGISTER
AS
SMBus/I2C
INTERFACE
Figure 1.
SCL
SDA
limit is exceeded. A configuration register allows programming of
the state of the ALERT output (active high or active low). This
output can be used as an interrupt or as an SMBus alert.
PRODUCT HIGHLIGHTS
1. On-chip temperature sensor. The sensor allows an accurate
measurement of the ambient temperature to be made. It is
capable of ±0.5°C temperature accuracy.
2. SMBus/I2C-compatible serial interface. The interface offers pin
selectable choice of three addresses per version of the
AD7414/AD7415, eight address options in total for the AD7414,
and six in total for the AD7415.
3. Supply voltage of 2.7 V to 5.5 V.
4. Space-saving 5-lead and 6-lead SOT-23 packages.
5. 10-bit temperature reading to 0.25°C resolution.
6. Overtemperature indicator. This indicator can be software
disabled. It is used as an interrupt of SMBus alert.
7. One-shot and automatic temperature conversion rates.
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 ©2001–2010 Analog Devices, Inc. All rights reserved.

AD7415
AD7414/AD7415
TABLE OF CONTENTS
Specifications .....................................................................................3 
Absolute Maximum Ratings ............................................................5 
ESD Caution ..................................................................................5 
Pin Configurations and Function Descriptions............................6 
Theory of Operation .........................................................................7 
Circuit Information ......................................................................7 
Functional Description.................................................................7 
Measurement Technique..............................................................7 
Temperature Data Format............................................................8 
Internal Register Structure...............................................................9 
Address Pointer Register ..............................................................9 
Configuration Register (Address 0X01) .....................................9 
Temperature Value Register (Address 0X00) ...........................10 
AD7414 THIGH Register (Address 0X02) ...................................10 
AD7414 TLOW Register (Address 0X03) ....................................10 
REVISION HISTORY
11/10—Rev. E to Rev. F
Added Data Hold Time, t7 Parameter, Table 1 ..............................4
Changes to Figure 2...........................................................................4
Updated to Outline Dimensions ...................................................16
Changes to Ordering Guide...........................................................18
4/05—Rev. D to Rev. E
Updated Format.................................................................. Universal
Changes to Absolute Maximum Ratings........................................6
Changes to Figure 6...........................................................................7
Changes to Ordering Guide...........................................................17
9/04—Rev. C to Rev. D.
Changes to Absolute Maximum Ratings........................................3
Updated Ordering Guide .................................................................4
8/03—Rev. B to Rev. C.
Change to Temperature Range ......................................... Universal
Updated Features...............................................................................1
Updated Specifications .....................................................................2
Updated Absolute Maximum Ratings ............................................3
Updated Ordering Guide .................................................................4
Serial Interface.................................................................................12 
Serial Bus Address.......................................................................12 
Write Mode ..................................................................................12 
Read Mode ...................................................................................12 
SMBUS ALERT.............................................................................13 
Power-On Defaults .....................................................................13 
Operating Modes ........................................................................13 
Power vs. Throughput ................................................................14 
Mounting the AD7414/AD7415 ...............................................14 
Supply Decoupling......................................................................14 
Temperature Accuracy vs. Supply.............................................15 
Typical Temperature Error Graph ............................................15 
Outline Dimensions........................................................................16 
Ordering Guide ...........................................................................18 
Updated Circuit Information ..........................................................5
Updated Temperature Data Format................................................6
Updated Temperature Value Register.............................................8
Updated Figure 14...........................................................................11
Updated Outline Dimensions........................................................12
11/02—Rev. A to Rev. B.
Changes to Absolute Maximum Ratings........................................3
10/02—Rev. 0 to Rev. A.
Changes to Specifications ................................................................2
Changes to Pin Function Descriptions ..........................................3
Changes to Absolute Maximum Ratings........................................3
Ordering Guide Updated .................................................................4
Change to Figure 2 ............................................................................5
Added to Typical Temperature
Error Graph section ........................................................................11
Added Figure 15 ..............................................................................11
Outline Dimensions updated ........................................................12
7/01—Revision 0: Initial Version
Rev. F | Page 2 of 20


Features FEATURES 10-bit temperature-to-digital c onverter Temperature range: −40°C to +125°C Typical accuracy of ±0.5°C a t +40°C SMBus/I2C®-compatible serial interface 3 μA power-down current Temp erature conversion time: 29 μs typ Spa ce-saving 6-lead (AD7414) and 5-lead (A D7415) SOT-23 packages Pin selectable a ddressing via AS Overtemperature indica tor (AD7414 Only) SMBus alert function (AD7414 only) 4 versions allow 8 I2C ad dresses (AD7414) 2 versions allow 6 I2C addresses (AD7415) APPLICATIONS Hard d isk drives Personal computers Electroni c test equipment Office equipment Domes tic appliances Process control Cellular phones GENERAL DESCRIPTION The AD7414/ AD7415 are complete temperature monitor ing systems in 6-lead and 5-lead SOT-23 packages. They contain a band gap temp erature sensor and a 10-bit ADC to moni tor and digitize the temperature readin g to a resolution of 0.25°C. The AD741 4/AD7415 provide a 2-wire serial interf ace that is compatible with SMBus and I2C interfaces. The parts.
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