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參數(shù)資料
| 型號： | LM64 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 【1∑C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO’s |
| 中文描述： | 【1ΣC遠程二極管溫度傳感器，PWM風扇控制和5個GPIO的 |
| 文件頁數(shù)： | 1/29頁 |
| 文件大?。?/td> | 363K |
| 代理商： | LM64 |
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LM64
±
1C Remote Diode Temperature Sensor with PWM Fan
Control and 5 GPIO’s
General Description
The LM64 is a remote diode temperature sensor with PWM
fan control. The LM64 accurately measures its own tempera-
ture and that of a remote diode. The LM64 remote tempera-
ture accuracy is factory trimmed for a MMBT3904 diode-
connected
transistor
with
a
16C
offset
for
high
temperatures. T
ACTUAL DIODE JUNCTION
= T
LM64
+ 16C
The LM64 features a PWM, open-drain, fan control output, 5
GPIO (General Purpose Input/Output) and 5 GPD (General
Purpose Default) pins. The 8-step Lookup Table allows for a
non-linear fan speed vs. temperature transfer function often
used to quiet acoustic fan noise.
Features
n
Accurately senses remote and local diode temperatures
n
Integrated PWM fan speed control output
n
Programmable 8-step Lookup Table for quieting fans
n
ALERT and T_Crit open-drain outputs
n
Tachometer input for measuring fan RPM
n
10 bit plus sign remote diode temperature data format,
with 0.125C resolution
n
SMBus 2.0 compatible interface, supports TIMEOUT
n
5 General Purpose Input/Output pins
n
5 General Purpose Default input pins
n
24-pin LLP package
Key Specifications
n
Remote Diode Temperature Accuracy (includes
quantization error)
Ambient Temp
30C to 50C
0C to 85C
Diode Temp
120C to 140C
25C to 140C
Max Error
±
1.0C (max)
±
3.0C (max)
n
Local Temp Accuracy (includes quantization error)
Ambient Temp
25C to 125C
Max Error
±
3.0C (max)
n
Power Supply Requirements
Supply DC Voltage
Supply DC Current
3.0 V to 3.6 V
1.1 mA (typ)
Applications
n
Computer Processor Thermal Management
n
Graphics Processor Thermal Management
n
Voltage Regulator Modules
n
Electronic Instrumentation
n
Power Supplies
n
Projectors
Connection Diagram
20065501
December 2003
L
1
2003 National Semiconductor Corporation
DS200655
www.national.com
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