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ICL7665A PDF预览

ICL7665A

更新时间： 2024-01-03 06:01:42
品牌 Logo 应用领域
美信 - MAXIM 监视器
页数 文件大小 规格书
12页 116K
描述
µ.P Voltage Monitor with Dual Over/Undervoltage Detection

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ICL7665A 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：, CAN8,.2Reach Compliance Code：unknown
风险等级：5.92JESD-30 代码：O-MBCY-W8
JESD-609代码：e0端子数量：8
最高工作温度：70 °C最低工作温度：-20 °C
封装主体材料：METAL封装等效代码：CAN8,.2
封装形状：ROUND封装形式：CYLINDRICAL
电源：5 V认证状态：Not Qualified
子类别：Power Management Circuits最大供电电流 (Isup)：0.015 mA
标称供电电压 (Vsup)：5 V技术：CMOS
温度等级：COMMERCIAL端子面层：Tin/Lead (Sn/Pb)
端子形式：WIRE端子位置：BOTTOM
Base Number Matches：1

ICL7665A 数据手册

 浏览型号ICL7665A的Datasheet PDF文件第4页浏览型号ICL7665A的Datasheet PDF文件第5页浏览型号ICL7665A的Datasheet PDF文件第6页浏览型号ICL7665A的Datasheet PDF文件第8页浏览型号ICL7665A的Datasheet PDF文件第9页浏览型号ICL7665A的Datasheet PDF文件第10页 
Mic ro p ro c e s s o r Vo lt a g e Mo n it o r w it h  
Du a l Ove r/Un d e rvo lt a g e De t e c t io n  
ICL765  
V
IN1  
V+  
V
IN2  
V
IN1  
V+  
V
IN2  
OUT1  
OUT2  
OUT1  
SET1  
OUT2  
R22  
R12  
R21  
R11  
R22  
R21  
R11  
ICL7665  
HYST1  
R31  
R32  
ICL7665  
HYST2  
SET1  
SET2  
SET2  
R12  
V+  
0V  
OUT1  
OUT1  
0V  
V+  
V
L1  
V
U1  
V
OUT2  
V
IN1  
V
IN1  
V
TRIP1  
OUT2  
V
TRIP2  
IN2  
V
V
L2 U2  
V
IN2  
Figure 3. Simple Threshold Detector  
Figure 4. Threshold Detector with Hysteresis  
the difference between the upper and lower trip points)  
keeps noise or small variations in the input signal from  
repeatedly switching the output when the input signal  
remains near the trip point for a long period of time.  
Ba s ic Ove r/Un d e rvo lt a g e  
De t e c t io n Circ u it s  
Figures 3, 4, and 5 show the three basic voltage detec-  
tion circuits.  
The third basic circuit, Figure 5, is suitable only when the  
voltage to be detected is also the power-supply voltage for  
the ICL7665. This circuit has the advantage that all of the  
current flowing through the input divider resistors flows  
through the hysteresis resistor. This allows the use of  
higher-value resistors, without hysteresis output leakage  
having an appreciable effect on the trip point.  
The simplest circuit, depicted in Figure 3, does not  
have any hysteresis. The comparator trip-point formulas  
can easily be derived by observing that the comparator  
changes state when the V  
input is 1.3V. The exter-  
SET  
nal resistors form a voltage divider that attenuates the  
input signal. This ensures that the V terminal is at  
SET  
1.3V when the input voltage is at the desired compara-  
tor trip point. Since the bias current of the comparator  
is only a fraction of a nanoamp, the current in the volt-  
age divider can be less than one microamp without los-  
ing accuracy due to bias currents. The ICL7665A has a  
2% threshold accuracy at +25°C, and a typical temper-  
ature coefficient of 100ppm/°C including comparator  
offset drift, eliminating the need for external poten-  
tiometers in most applications.  
Resistor-Value Calculations  
Figure 3  
1) Choose a value for R11. This value determines the  
amount of current flowing though the input divider,  
equal to V  
/ R11. R11 can typically be in the  
SET  
range of 10kΩ to 10MΩ.  
2) Calculate R21 based on R11 and the desired trip  
point:  
Figure 4 adds another resistor to each voltage detector.  
This third resistor supplies current from the HYST out-  
put whenever the V  
old . As the formula s s how, this hys te re s is re s is tor  
affects only the lower trip point. Hysteresis (defined as  
input is above the 1.3V thresh-  
SET  
V
– V  
V
– 1.3V  
TRIP  
SET  
TRIP  
R21 = R11 ——————— = R11 ——————  
(
)
(
)
V
1.3V  
SET  
_______________________________________________________________________________________  
7
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