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HT7039A-2 Datasheet(PDF) 8 Page - Holtek Semiconductor Inc

Part No. HT7039A-2
Description  TinyPowerTM Voltage Detector
Download  17 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7039A-2 Datasheet(HTML) 8 Page - Holtek Semiconductor Inc

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HT70xxA-2
Rev. 1.00
8
February 10, 2012
· with 5V voltage regulator
Change of Detectable Voltage
If the required voltage is not found in the standard
product selection table, it is possible to change it by
using external resistance dividers or diodes.
· Varying the detectable voltage with a resistance di-
vider
Detectable voltage =
R+ R
R
AB
B
´ VDET
Hysteresis width =
R+ R
R
AB
B
´ VHYS
· Varying the detectable voltage with a diode
Detectable Voltage = Vf1+Vf2+VDET
Malfunction Analysis
The following circuit demonstrates the way a circuit
analyzes malfunctions by monitoring the variation or
spike noise of power supply voltage.
Charge Monitoring Circuit
The following circuit shows a charged monitor for
protection against battery deterioration by
overcharging. When the voltage of the battery is higher
than the set detectable voltage, the transistor turns on to
bypass the charge current, protecting the battery from
overcharging.
H T 7 0 4 4 A - 2
V S S
V D D
H T 7 1 5 0 - 1
V O U T
V I N
G N D
5 V
5 V V o l t a g e r e g u l a t o r
H T 7 0 X X A - 2
V S S
V I N
V S S
V O U T
V D D
R A
R B
H T 7 0 X X A - 2
V D D
V I N
V S S
V f 1
V f 2
V O U T
V S S
H T 7 0 X X A - 2
V O U T
V S S
V D D
V S S
H T 7 0 X X A - 2
V D D
V O U T
V S S
L o a d
B A T T
S o l a r
C e l l
T r


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