CF5761 series

SEIKO NPC CORPORATION —9

Test Function

The CF5761 series have a test mode of operation where the output cycles are compressed. T1 has a built-in

chattering elimination circuit to prevent incorrect operation due to input chatter. When T1 goes HIGH for an

interval of 31.25ms or greater, test mode is invoked. When T1 becomes open circuit, normal mode operation

resumes immediately and a 256Hz signal is output on T1.

TYPICAL APPLICATION CIRCUITS

T1

Function

HIGH

Motor outputs: In step movement devices, the output runs 16 times faster with normal pulsewidth. In sweep movement devices,

the output runs 16 times faster with 50% duty pulsewidth.

Alarm outputs: Alarm operates at the same frequency with modulation frequency 16 times faster and step output changes 8 times

faster (CF5761EA, LB, NB) or 4 times faster (CF5761MB).

140.625ms in other modes.

1. The auto-stop time applies only to CF5761 versions that support the auto-stop function. See the series lineup table.

Open circuit

256Hz output (normal operation)

Piezo-electric speaker

Electromagnetic speaker

Motor bell

Melody alarm

XTN

X'tal

AO1

VDD

XT

AO2

AI

SN

SEL

AO3

VSS

O1

O2

M

XTN

X'tal

AO1

VDD

XT

AO2

AI

SN

SEL

AO3

VSS

O1

O2

M

XTN

X'tal

AO1

VDD

XT

AO2

AI

SN

SEL

AO3

VSS

O1

O2

M

M

Motorbell

XTN

X'tal

AO1

VDD

XT

AO2

AI

SN

SEL

AO3

VSS

O1

O2

M

VSS

F

VDD

Melody IC