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ADT7408 データシート(PDF) 1 Page - Analog Devices

部品番号. ADT7408
部品情報  -2 C Accurate, 12-Bit Digital Temperature Sensor
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ホームページ  http://www.analog.com
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ADT7408 Datasheet(HTML) 1 Page - Analog Devices

 
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±2°C Accurate, 12-Bit Digital
Temperature Sensor
ADT7408
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
©2006 Analog Devices, Inc. All rights reserved.
FEATURES
12-bit temperature-to-digital converter
±2°C accuracy
Operation from −20°C to +125°C
Operation from 3 V to 3.6 V
240
μA typical average supply current
Selectable 1.5°C, 3°C, 6°C hysteresis
SMBus-/I2C®-compatible interface
Dual-purpose event pin: comparator or interrupt
8-lead LFCSP_VD, 3 mm × 3 mm (JEDEC MO-229 VEED-4)
package
Complies with JEDEC standard JC-42.4 memory module
Thermal sensor component specification
APPLICATIONS
Memory module temperature monitoring
Isolated sensors
Environmental control systems
Computer thermal monitoring
Thermal protection
Industrial process control
Power system monitors
FUNCTIONAL BLOCK DIAGRAM
12- / 10-Bit
ADDRESS
POINTER
REGISTER
EVENT#
∑-∆
DIGITAL COMPARATOR
DECIMATOR
A1
A0
A2
SMBus/I²C INTERFACE
ADT7408
Vss
SDA
SCL
FACTORY
RESERVED
REGISTER
TEMPERATURE
REGISTER
MANUFACTURER’S
ID REGISTER
CRITICAL TEMP
REGISTER
ALARM TEMP
LOWER
BOUNDARY TRIP
REGISTER
ALARM TEMP
UPPER
BOUNDARY TRIP
REGISTER
CONFIGURATION
REGISTER
CAPABILITY
REGISTER
REFERENCE
TEMPERATURE
SENSOR
CLK
AND TIMING
GENERATION
1-BIT
VDD
6
5
4
1
2
3
7
8
+
LPF
1-BIT
DAC
+
Figure 1.
GENERAL DESCRIPTION
The ADT7408 is the first digital temperature sensor that complies
with JEDEC standard JC-42.4 for the mobile platform memory
module. The ADT7408 contains a band gap temperature sensor
and a 12-bit ADC to monitor and digitize the temperature to a
resolution of 0.0625°C.
There is an open-drain EVENT# output that is active when the
monitoring temperature exceeds a critical programmable limit or
when the temperature falls above or below an alarm window.
This pin can operate in either comparator or interrupt mode.
There are three slave device address pins that allow up to eight
ADT7408s to be used in a system that monitors temperature of
various components and subsystems.
The ADT7408 is specified for operation at supply voltages from
3.0 V to 3.6 V. Operating at 3.3 V, the average supply current is
less than 240 μA typical. The ADT7408 offers a shutdown mode
that powers down the device and gives a shutdown current of 3 μA
typical. The ADT7408 is rated for operation over the −20°C to
+125°C temperature range. The ADT7408 is available in a lead-
free, 8-lead LFCSP_VD, 3 mm × 3 mm (JEDEC MO-229 VEED-4)
package.


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