sm1125abv Nippon Precision Circuits Inc, (NPC), sm1125abv Datasheet - Page 2

• Manufacturer Part Number: sm1125abv
• Description: Multimelody Pagers
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

BLOCK DIAGRAM
PIN DESCRIPTION
Number
1
2
3
4
5
6
7
8
OSC
SC
ST
SI
Name
TEST
OSC
MTO
VDD
VSS
SC
ST
SI
Tempo Counter
Tempo Latch
OSC
I/O
O
–
–
I
I
I
I
I
Control
Circuit
Divider
1/128
External resistor and capacitor connection pins
Playback control serial interface data input
Playback control serial interface clock input
Playback start/stop control signal input
Test input pin. Leave open or tie to VSS. (pull-down resistance built-in)
Playback melody signal output
Supply pin (+)
Ground pin
SM1125ABV
Rhythm
Counter
1/2 or 1/4
Counter
Address
Counter
Address
ROM
Scale
Scale
ROM
Main
Multi-
Plexer
Latch
Start
Function
SW2
SEIKO NPC CORPORATION —2
VSS
MTO
TEST
VDD