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参数资料
| 型号： | ICL7665AEPA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC VOLT MONITOR LP W/DET 8-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效 |
| 复位超时： | 最小 <1 ms |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
Microprocessor Voltage Monitor with
Dual Over/Undervoltage Detection
V IN1
V+
V IN2
V IN1
V+
V IN2
R21
OUT1
OUT2
ICL7665
R22
R21
R31
OUT1 OUT2
ICL7665
HYST1 HYST2
R32
R22
R11
SET1
SET2
R12
R11
SET1
SET2
R12
V+
OUT1
OUT1
V IN1
V TRIP1
V IN1
V L1
V U1
0V
V+
OUT2
OUT2
V IN2
V TRIP2
0V
V IN2
V L2 V U2
( ) ( )
Figure 3. Simple Threshold Detector
Basic Over/Undervoltage
Detection Circuits
Figures 3, 4, and 5 show the three basic voltage detec-
tion circuits.
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 SET input is 1.3V. The exter-
nal resistors form a voltage divider that attenuates the
input signal. This ensures that the V SET terminal is at
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.
Figure 4 adds another resistor to each voltage detector.
This third resistor supplies current from the HYST out-
put whenever the V SET input is above the 1.3V thresh-
old. As the formulas show, this hysteresis resistor
affects only the lower trip point. Hysteresis (defined as
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.
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.
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 SET / R11. R11 can typically be in the
range of 10k ? to 10M ? .
2) Calculate R21 based on R11 and the desired trip
point:
V TRIP – V SET V TRIP – 1.3V
R21 = R11 ——————— = R11 ——————
V SET 1.3V
_______________________________________________________________________________________
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICL7665AEPA+ | 功能描述:电压监测器/监控器 uP V Monitor w/Dual Over/Under V Detect RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| ICL7665AESA | 功能描述:电压监测器/监控器 Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| ICL7665AESA+ | 功能描述:电压监测器/监控器 uP V Monitor w/Dual Over/Under V Detect RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| ICL7665AESA+T | 功能描述:电压监测器/监控器 uP V Monitor w/Dual Over/Under V Detect RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
| ICL7665AESA-T | 功能描述:电压监测器/监控器 RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
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