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MIC281-4BM6 PDF Datasheet浏览和下载

型号:
MIC281-4BM6
PDF下载:
下载PDF文件 在线浏览文档
内容描述:
低成本IttyBitty热传感器IttyBitty [Low-Cost IttyBitty Thermal Sensor IttyBitty]
文件大小:
174 K
文件页数:
12 Pages
品牌Logo:
品牌名称:
MICREL [ MICREL SEMICONDUCTOR ]



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MIC281
Micrel
MIC281
Low-Cost IttyBitty™ Thermal Sensor IttyBitty®
REV 11/04
General Description
The MIC281 is a digital thermal sensor capable of measuring
the temperature of a remote PN junction. It is optimized for
applications favoring low cost and small size. The remote
junction may be an inexpensive commodity transistor, e.g.,
2N3906, or an embedded thermal diode such as found in
Intel Pentium* II/III/IV CPUs, AMD Athlon* CPUs, and Xilinx
Virtex* FPGAs.
The MIC281 is 100% software and hardware backward com-
patible with the MIC280 and features the same industry-leading
noise performance and small size. The advanced integrating
A/D converter and analog front-end reduce errors due to noise
for maximum accuracy and minimum guardbanding.
A 2-wire SMBus 2.0-compatible serial interface is provided for
host communication. The clock and data pins are 5V-tolerant
regardless of the value of V
DD
. They will not clamp the bus
lines low even if the device is powered down.
Superior performance, low power, and small size make the
MIC281 an excellent choice for cost-sensitive thermal man-
agement applications.
Features
• Remote temperature measurement using embedded
thermal diodes or commodity transistors
Accurate remote sensing
±3°C max., 0°C to 100°C
• Excellent noise rejection
• I
2
C and SMBus 2.0 compatible serial interface
• SMBus timeout to prevent bus lockup
• Voltage tolerant I/Os
• Low power shutdown mode
• Failsafe response to diode faults
• 3.0V to 3.6V power supply range
• IttyBitty™ SOT23-6 Package
Applications
Desktop, server and notebook computers
Set-top boxes
Game consoles
Appliances
Typical Application
3.3V
10k
pull-ups
5
TO
SERIAL BUS
HOST
4
MIC281
DATA
CLK
NC
VDD
T1
GND
1
3
2
0.1µF
2000pF
CPU DIODE
MIC281 Typical Application
IttyBitty is a registered trademark of Micrel, Inc.
*All trademarks are the property of their respective owners.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2004
1
MIC281