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參數資料
型號: HT7022A
廠商: Holtek Semiconductor Inc.
英文描述: Voltage Detector
中文描述: 電壓檢測器
文件頁數: 8/16頁
文件大小: 162K
代理商: HT7022A
HT70XX
Rev. 1.60
8
January 14, 2003
5V power line monitoring circuit
Generally, a minimum operating voltage of 4.5V is guar-
anteed in a 5V power line system. The HT7044A is rec-
ommended for use as 5V power line monitoring circuit.
5V power line monitor with power-on reset
with 5V voltage regulator
Change of detectable voltage
If the required voltage is not found in the standard prod-
uct selection table, it is possible to change it by using ex-
ternal resistance dividers or diodes.
Varying the detectable voltage with a resistance di-
vider
Detectable voltage =R
R
R
R
A
B
B
V
DET
Hysteresis width =R
R
A
B
B
V
HYS
Varying the detectable voltage with a diode
Detectable Voltage = V
f1
+V
f2
+V
DET
Malfunction analysis
The following circuit demonstrates the way a circuit ana-
lyzes malfunctions by monitoring the variation or spike
noise of power supply voltage.
Charge monitoring circuit
The following circuit shows a charged monitor for pro-
tection against battery deterioration by overcharging.
Whenthevoltageofthebatteryishigherthanthesetde-
tectable voltage, the transistor turns on to bypass the
charge current, protecting the battery from overcharg-
ing.
'
'
(
)
*
(
(
* ! +
+ & * !
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! ,
* !
* *
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參數描述
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HT7022A-1 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:TinyPower Voltage Detector
HT7022A-2 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:TinyPowerTM Voltage Detector
HT7022A-3 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:TinyPowerTM Voltage Detector
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