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| 型号： | LM89EVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 1/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION LM89 |
| 标准包装： | 1 |
| 传感器类型： | 温度 |
| 传感范围： | 0°C ~ 125°C |
| 接口： | SMBus（2 线/I²C） |
| 灵敏度： | ±1°C |
| 电源电压： | 3 V ~ 3.6 V |
| 嵌入式： | 否 |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | LM89 |
| 相关产品： | LM89CIM-ND - IC TEMP SENSOR DGTL 8-SOIC LM89CIMX-ND - IC TEMP SENSOR DGTL 8-SOIC LM89CIMM-ND - IC TEMP SENSOR DGTL 8-MSOP LM89CIMMX-ND - IC TEMP SENSOR DGTL 8-MSOP |
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SNIS128C – AUGUST 2002 – REVISED MARCH 2013
LM89 ±0.75°C Accurate, Remote Diode and Local Digital Temperature Sensor
With Two-Wire Interface
Check for Samples: LM89
1
FEATURES
DESCRIPTION
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Accurately Senses Die Temperature of Remote
ICs or Diode Junctions
Offset Register Allows Sensing a Variety of
Thermal Diodes Accurately
On-Board Local Temperature Sensing
10-Bit Plus Sign Remote Diode Temperature
Data Format, 0.125°C Resolution
T_CRIT_A Output Useful for System Shutdown
ALERT Output Supports SMBus 2.0 Protocol
SMBus 2.0 Compatible Interface, Supports
TIMEOUT
8-Pin VSSOP and SOIC Packages
The LM89 is an 11-bit digital temperature sensor with
a 2-wire System Management Bus (SMBus) serial
interface. The LM89 accurately measures its own
temperature as well as the temperature of an external
device, such as processor thermal diode or diode-
connected transistor such as the 2N3904. The
temperature of any ASIC can be accurately
determined using the LM89 as long as a dedicated
diode (semiconductor junction) is available on the
target die. The LM89 remote sensor accuracy of
±0.75°C is factory trimmed for the series resistance
and 1.0021 typical nonideality factor of the
IntelPentium 4 and the Mobile Pentium 4 Processor-
M thermal diode. The LM89 has an Offset register to
allow measuring other diodes without requiring
APPLICATIONS
continuous software management. Visit www.ti.com
to obtain the latest data for new processors.
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Processor/Computer System Thermal
Management
(For Example, Laptop, Desktop, Workstations,
Server)
Electronic Test Equipment
Office Electronics
The LM89 and the LM89-1 have the same functions
but different SMBus slave addresses. This allows for
one of each to be on the bus at the same time.
Activation of the ALERT output occurs when any
temperature goes outside a preprogrammed window
set by the HIGH and LOW temperature limit registers
or exceeds the T_CRIT temperature limit. Activation
KEY SPECIFICATIONS
of the T_CRIT_A occurs when any temperature
exceeds the T_CRIT programmed limit. The LM89 is
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Supply Voltage: 3.0 V to 3.6 V
Supply Current: 0.8 mA (typ)
Local Temp Accuracy (includes quantization
error)
– T A = 25°C to 125°C ±3.0 °C (max)
Remote Diode Temp Accuracy (includes
pin and register compatible with the LM86, LM90,
Analog Devices ADM1032 and Maxim MAX6657/8.
quantization error)
– T A = 30°C, T D = 80°C ±0.75 °C (max)
– T A = 30°C to 50°C, T D = 60°C to 100°C ±1.0
°C (max)
– T A = 0°C to 85°C, T D = 25°C to 125°C ±3.0 °C
(max)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright ? 2002–2013, Texas Instruments Incorporated
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