參數(shù)資料
型號(hào)： ASC7512D8
廠商： Electronic Theatre Controls, Inc.
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMPERATURE SENSOR WITH INTEGRATED FAN CONTROL
中文描述： 數(shù)字溫度傳感器整合了風(fēng)扇控制
文件頁(yè)數(shù)： 32/35頁(yè)
文件大?。?/td> 337K
代理商： ASC7512D8
- 32 -
Andigilog, Inc. 2006
www.andigilog.com
August 2006 - 70A05003
aSC7512
Thermal Considerations
The temperature of the aSC7512 will be close to that of
the PC board on which it is mounted. Conduction through
the leads is the primary path for heat flow. The reported
local sensor is very close to the circuit board temperature
and typically between the board and ambient.
In order to measure PC board temperature in an area of
interest, such as the area around the CPU where voltage
regulator components generate significant heat, a remote
diode-connected transistor should be used. A surface-
mount SOT-23 or SOT-223 is recommended. The small
size is advantageous in minimizing response time
because of its low thermal mass, but at the same time it
has low surface area and a high thermal resistance to
ambient air. A compromise must be achieved between
minimizing thermal mass and increasing the surface area
to lower the junction-to-ambient thermal resistance.
In order to sense temperature of air-flows near board-
mounted heat sources, such as memory modules, the
sensor should be mounted above the PC board. A TO-92
packaged transistor is recommended.
The power consumption of the aSC7512 is relatively low
and should have little self-heating effect on the local
sensor reading. At the highest measurement rate the
dissipation is less than 2mW, resulting in only a few
tenths of a degree rise.
Evaluation Board
The aSC7511/aSC7512EVB provides a platform for
evaluation of the operational characteristics of the
aSC7511 and aSC7512. The board features a graphical
user interface (GUI) to control and monitor all activities
and readings of the aSC7511. The provided software will
run on a Windows XP-based desktop or laptop PC with
a USB port.
In addition to being a self-contained fan speed control
demonstration, it may be connected into an operating
PC’s fan and CPU diode to evaluate various settings
under real operating conditions without the need to adjust
BIOS code. After optimization, the settings may be
programmed into the system.
Features:
Interactive GUI for setting limits and operational
configuration
aSC7512 Automatic Fan Control
Powered and operated from the USB port
Graphical readouts:
Temperature and alarms
Fan RPM
Automatic fan control state
Selectable on-board 2N3904 or wired remote
diode
Headers for 2-, 3- and 4-wire fans
Customizable Log file of readings
Saving of register setting configurations
LED indicator of pin state
Optional use of external 12V fan power for
higher current fans
Optional connection to off-board SMBus clients
Application Diagrams
The aSC7512 may be easily adapted to two-, three- or 4-
wire fans for precise, wider-range fan speed control when
compared to variable DC drive. Pin 6 may optionally be
used as
ALERT
, pulled up to 3.3V with a 10K resistor to
warn the system of an extreme condition needing
immediate attention in any fan configuration.
Figure 14 aSC7512 2-, 3- and 4-Wire Fan
Connections
Sensor
Sensor
CPU
or FDC637AN
SMBDAT
SMBCLK
2.2K
2.2K
10K
5V
3.3V
Module
D -
VDD
aSC7512
PWM
GND
TACH
SMBDAT
SMBCLK
6
8
7
5
3
1
2
4
Sensor
CPU
SMBDAT
SMBCLK
2.2K
2.2K
10K
5V
12V
Module
D -
VDD
aSC7512
PWM
GND
TACH
SMBDAT
SMBCLK
3
1
2
4
CPU
or FDC637AN
SMBDAT
SMBCLK
2.2K
2.2K
10K
5V
3.3V
Module
D -
VDD
aSC7512
PWM
GND
TACH
SMBDAT
SMBCLK
6
8
7
5
3
1
2
4
6
8
7
5
10K
15K
7.5K
10K
3.3V
3.3V
Remote
Remote
NDT3055L
5V
in Cooling
D +
Remote
in Cooling
D +
NDT3055L
5V
in Cooling
D +
Optional
ALERT
相關(guān)PDF資料
PDF描述
ASC7512M8 DIGITAL TEMPERATURE SENSOR WITH INTEGRATED FAN CONTROL
ASC7521A LOW- OLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR
ASC7521AM8 LOW- OLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR
ASC7531A LOW-VOLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR AND VOLTAGE MONITOR
ASC7531AM10 LOW-VOLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR AND VOLTAGE MONITOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ASC7512M8 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DIGITAL TEMPERATURE SENSOR WITH INTEGRATED FAN CONTROL
ASC7521A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LOW- OLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR
ASC7521AM8 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LOW- OLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR
ASC7531A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LOW-VOLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR AND VOLTAGE MONITOR
ASC7531AM10 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LOW-VOLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR AND VOLTAGE MONITOR
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