HT7050A-1 Просмотр технического описания (PDF) - Holtek Semiconductor

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HT7050A-1

TinyPower™ Voltage Detector

Holtek Semiconductor 

· with 5V voltage regulator

5 V V o lta g e r e g u la to r

V IN

H T 7 1 5 0 -1 5 V

GND

V DD

V OUT

H T 7 0 4 4 A -1

V SS

HT70xxA-1

Malfunction Analysis

The following circuit demonstrates the way a circuit

analyzes malfunctions by monitoring the variation or

spike noise of power supply voltage.

V DD

V OUT

H T 7 0 x x A -1

V SS

V SS

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

V IN

RA

V DD

V OUT

H T 7 0 x x A -1

RB

V SS

V SS

Detectable

voltage

=

RA + RB

RB

´

VDET

Hysteresis

width

=

RA + RB

RB

´

VHYS

· Varying the detectable voltage with a diode

V IN

V f1

V f2

V DD

V OUT

H T 7 0 x x A -1

V SS

V SS

Detectable Voltage = Vf1+Vf2+VDET

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.

V DD

S o la r

V OUT

C e ll T r

BATT

Load

H T 7 0 x x A -1

V SS

Rev. 2.00

8

April 30, 2013

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