CF5761 series
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.
T1
Function
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).
Snooze time, auto-stop time
1
: 281.25ms (CF5761EA, LB, NB) or 562.5ms (CF5761MB) in step output alarm mode, and
140.625ms in other modes.
256Hz output (normal operation)
HIGH
Open circuit
1. The auto-stop time applies only to CF5761 versions that support the auto-stop function. See the series lineup table.
TYPICAL APPLICATION CIRCUITS
Piezo-electric speaker
Electromagnetic speaker
C
G
X'tal
C
G
X'tal
XT
XTN
VDD
XT
XTN
VDD
AI
AO1
SN
AO2
SEL
O1
AO3
VSS
AI
AO1
SN
AO2
SEL
O1
AO3
VSS
M
O2
M
O2
Motor bell
Melody alarm
C
G
X'tal
C
G
Motorbell
X'tal
M
XT
XTN
VDD
XT
XTN
VDD
VDD
AI
AO1
SN
AO2
SEL
O1
AO3
SEL
O1
AO3
VSS
F
VSS
SN
Melody IC
AO2
AI
AO1
M
O2
VSS
M
O2
SEIKO NPC CORPORATION —9
NPC [ NIPPON PRECISION CIRCUITS INC ]
