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| 型号： | ICL7665ACPA |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC VOLT DETEC DUAL OVR/UND 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： | 0°C ~ 70°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
Figure 5
V IN
1) Select a value for R11, usually between 10k ? and
10M ? .
R31
R32
2) Calculate R21:
( )
( )
R21
V+
HYST1 HYST2
ICL7665
SET1 SET2
R22
V L – V SET
R21 = R11 ——————
V SET
3) Calculate R31:
V L – 1.3V
= R11 —————
1.3
( )
OVERVOLTAGE
R11
OUT1
GND
OUT2
UNDERVOLTAGE
R12
V U – V L
R31 = R11 —————
V SET
4) As in the other circuits, all three resistor values may
be scaled up or down in value without changing V U
( ) ( )
OUT1
V L1 V U1
OUT2
V L2 V U2
V IN
Figure 5. Threshold Detector, V IN = V+
Figure 4
1) Choose a resistor value for R11. Typical values are
in the 10k ? to 10M ? range.
2) Calculate R21 for the desired upper trip point, V U,
using the formula:
V U - V SET V U – 1.3V
R21 = R11 —————— = R11 —————
V SET 1.3V
3) Calculate R31 for the desired amount of hysteresis:
(R21) (V+ – V SET ) (R21) (V+ – 1.3V)
R31 = ————————— = —————————
V U – V L V U – V L
or, if V+ = V IN :
(R21) (V L – V SET ) (R21) (V L – 1.3V)
R31 = ————————— = —————————
V U – V L V U – V L
4) The trip voltages are not affected by the absolute
value of the resistors, as long as the impedances
are high enough that the resistance of R31 is
much greater than the HYST output’s resistance,
and the current through R31 is much higher than
the HYST output’s leakage current. Normally, R31
will be in the 100k ? to 22M ? range. Multiplying or
dividing all three resistors by the same factor will
not affect the trip voltages.
and V L . V U and V L depend only on the ratio of the
three resistors, if the absolute values are such that
the hysteresis output resistance and the leakage
currents of the V SET input and hysteresis output can
be ignored.
__________Applications Information
Fault Monitor for a Single Supply
Figure 6 shows a typical over/undervoltage fault monitor
for a single supply. In this case, the upper trip points (con-
trolling OUT1) are centered on 5.5V, with 100mV of hys-
teresis (V U = 5.55V, V L = 5.45V); and the lower trip points
(controlling OUT2) are centered on 4.5V, also with 100mV
of hysteresis. OUT1 and OUT2 are connected together in
a wire-OR configuration to generate a power-OK signal.
Multiple-Supply Fault Monitor
The ICL7665 can simultaneously monitor several power
supplies, as shown in Figure 7. The easiest way to calculate
the resistor values is to note that when the V SET input is at
the trip point (1.3V), the current through R11 is 1.3V / R11.
The sum of the currents through R21A, R21B and R31 must
equal this current when the two input voltages are at the
desired low-voltage detection point. Ordinarily, R21A and
R21B are chosen so that the current through the two resis-
tors is equal. Note that, since the voltage at the ICL7665
V SET input depends on the voltage of both supplies being
monitored, there will be some interaction between the low-
voltage trip points for the two supplies. In this example,
OUT1 will go low when either supply is 10% below nominal
(assuming the other supply is at the nominal voltage), or
when both supplies are 5% or more below their nominal
voltage. R31 sets the hysteresis, in this case, to about 43mV
at the 5V supply or 170mV at the 15V supply. The second
section of ICL7665 can be used to detect overvoltage or, as
shown in Figure 7, can be used to detect the absence of
negative supplies. Note that the trip points for OUT2 depend
on both the voltages of the negative power supplies and
the actual voltage of the +5V supply.
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICL7665ACPA+ | 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 |
| ICL7665ACPA-2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| ICL7665ACSA | 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 |
| ICL7665ACSA+ | 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 |
| ICL7665ACSA+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 |
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