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ADT14GS

更新时间: 2024-11-08 22:05:23
品牌 Logo 应用领域
亚德诺 - ADI 传感器换能器输出元件监控
页数 文件大小 规格书
16页 340K
描述
Quad Setpoint, Programmable Temperature Monitor and Controller

ADT14GS 数据手册

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Quad Setpoint, Programmable  
Temperature Monitor and Controller  
a
ADT14  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Four Programmable Temperature Setpoints  
Programmable Thermal Hysteresis  
Accuracy ؎3؇C Typ from –40؇C to +125؇C  
Temperature Output Scale Factor = 5 mV/K  
Resistor Programmable Temperature Setpoints  
5 mA Open-Collector Setpoint Outputs  
Internal 2.5 V Reference  
2.5V  
HYSTERESIS  
V
REF  
SETPOINT  
OUTPUT 1  
SET 1  
CURRENT  
MIRROR  
SETPOINT  
OUTPUT 2  
600 A Max Quiescent Current at +5 V  
SET 2  
APPLICATIONS  
Power Supply Monitor and Control System  
Multiple Fan Controller System  
Workstation Thermal Management System  
SETPOINT  
OUTPUT 3  
SET 3  
WINDOW  
COMPARATORS  
SETPOINT  
OUTPUT 4  
SET 4  
GENERAL DESCRIPTION  
The ADT14 is a temperature sensor and controller that generates  
an output voltage proportional to temperature and provides four  
temperature trip points. The four trip points, or temperature  
setpoints, and their hysteresis are determined by voltage levels set  
by the user. An on-chip voltage reference provides an easy method  
for setting the temperature trip points.  
HYSTERESIS  
VOLTAGE  
VOLTAGE  
REFERENCE  
AND  
V+  
VPTAT  
SENSOR  
TEMPERATURE  
OUTPUT  
ADT14  
GND  
The ADT14 consists of a bandgap voltage reference combined  
with four matched comparators. The reference provides both a  
temperature-stable 2.5 V output, and a voltage proportional to  
absolute temperature (VPTAT) which has a precise temperature  
coefficient of 5 mV/K = 5 mV/(°C +273.15). The VPTAT out-  
put is nominally 1.49 V at +25°C. The comparators determine  
whether the VPTAT output is above the voltages set up by  
external resistive dividers (temperature trip points) and generate  
an open-collector output signal when one of their respective  
thresholds has been exceeded.  
PIN CONFIGURATIONS  
DIP & SO  
OUTPUT 1  
SETPOINT 1  
NC  
OUTPUT 4  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
SETPOINT 4  
2.5V REFERENCE  
V+  
ADT14  
NC  
TOP VIEW  
(Not to Scale)  
GROUND  
VPTAT  
NC  
Hysteresis is programmed by a user-selected voltage at the hys-  
teresis pin. This voltage adjusts the hysteresis current which is  
used to generate a hysteresis offset voltage. The comparator’s  
noninverting inputs are connected in parallel, which guarantees  
that there is no hysteresis overlap and eliminates erratic transi-  
tions between adjacent trip zones.  
HYSTERESIS  
SETPOINT 3  
OUTPUT 3  
SETPOINT 2  
OUTPUT 2  
NC = NO CONNECT  
Using a proprietary thin-film resistor process in conjunction  
with production laser trimming, a temperature accuracy of ±3°C  
at 25°C is guaranteed. The open-collector outputs are capable  
of sinking 5 mA, and provide TTL/CMOS logic compatibility  
with an external pull-up resistor. Operating from a single 5 V  
supply, the quiescent current is 600 µA max.  
The ADT14 is available in the 16-lead epoxy DIP and SO  
(small outline) packages.  
REV. 0  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, nor for any infringements of patents or other rights of third parties  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 617/329-4700  
Fax: 617/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1997  

ADT14GS 替代型号

型号 品牌 替代类型 描述 数据表
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