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SM1125ABV Datenblatt(PDF) 5 Page - Nippon Precision Circuits Inc

Teilenummer SM1125ABV
Bauteilbeschribung  Multimelody IC for Pagers
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Hersteller  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM1125ABV Datenblatt(HTML) 5 Page - Nippon Precision Circuits Inc

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SM1125ABV
SEIKO NPC CORPORATION —5
FUNCTIONAL DESCRIPTION
Control Functions
Reference clock
SM1125ABV has built-in RC oscillator circuit (oscillation frequency: 38.4kHz typ).
Power-saving function
The built-in RC oscillator is stopped when not in playback mode (when ST is LOW), preventing unwanted cur-
rent flow.
Playback control
The ST pin controls the start of playback. While ST is HIGH, the melody is played repeatedly, and when ST
goes LOW, playback stops. Melodies are selected by input serial data on pins SI and SC, as shown in table 1.
The final 4 serial data bits in any input data string form the valid selection data, and this data is retained even
after playback. If serial data is input during playback, the data is ignored and playback continues.
Serial data selection
Figure 1. Oscillator circuit operation
Pin SC should be LOW when either a LOW-to-HIGH or HIGH-to-LOW transition occurs on pin ST.
Figure 2. Serial data input timing
Table 1. Serial data melody select
B3
B2
B1
B0
ST
Melody
B3
B2
B1
B0
ST
Melody
LLLL
L
→ H
1st melody
L
H
H
L
L
→ H
7th melody
LLL
H
L
→ H
2nd melody
L
H
H
H
L
→ H
8th melody
L
LHL
L
→ H
3rd melody
H
L
L
L
L
→ H
9th melody
LL
H
H
L
→ H
4th melody
H
L
L
H
L
→ H
10th melody
LHL
L
L
→ H
5th melody
HLHL
L
→ H
11th melody
LHLH
L
→ H
6th melody
H
L
H
H
L
→ H
12th melody
Melody plays repeatedly when ST is HIGH, and stops immediately when ST goes LOW.
Figure 3. Melody repetition timing
ST
OSC
RC Oscillator
SI
SC
ST
MTO
?? B3 B2 B1 B0
?
?? ?
Invalid
Data
Valid
Data
Invalid
Data
SI
SC
ST
MTO
#n1 Data
#n2 Data
#n1 Play
#n1 Play
#n1 Play
#n2 Play


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