HT6751A datasheet(4/5 Pages) HOLTEK

4 / 5 page

Application Circuits

HT6751A/B

August 7, 2000

In normal state and standby mode

–

Charge pump circuit is in off state

–

Oscillator circuit is in off state

–

Standby current is below 2mA

–

For HT6751A, the oscillator circuit and

charge pump circuit is on until IN1 or IN2

or IN3 is low input

–

For HT6751B, the oscillator circuit and

charge pump circuit is on until IN1 or IN2

or IN3 is high input

The system enters thermal shutdown mode

(current is limited below 500mA) when the

temperature of the internal sensor is

greater than Junction Temperature and

then release this mode until the tempera-

ture of the internal sensor below (Junction

Temperatue >150°C). The system can ac-

cept IN1/IN2/IN3 signal when in thermal

shutdown mode.

IN 1

IN 2

IN 3

OU T 1

OU T 2

VS S

VD D

1. 5 C hannel

fo r

m C/ A S I C

OU T 3

V DD

Ex t e r n a l

H T 6751A / B

V M

IN 1

IN 2

IN 3

OU T 1

OU T 2

VS S

VD D

1 C han nel

fo r

m C/ A S I C

H T 6751A

V DD

V M

V DD

IN 1

IN 2

IN 3

OU T 1

OU T 2

VS S

VD D

1 C han nel

fo r

m C/ A S I C

H T 6751B

V DD

V M

IN 1

IN 2

IN 3

OU T 1

OU T 2

VS S

VD D

H T 6751A

V DD

V M

V DD

Fo r w a r d

Re v e r s e

Br a k e

IN 1

IN 2

IN 3

V S S

VD D

V DD

V M

Fo r w a r d

Re v e r s e

Br a k e

H T 6751B

OU T 1

OU T 2

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