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SM1125 Datenblatt(PDF) 5 Page - Nippon Precision Circuits Inc

Teilenummer SM1125
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

SM1125 Datenblatt(HTML) 5 Page - Nippon Precision Circuits Inc

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SM1125 series
SEIKO NPC CORPORATION —5
FUNCTIONAL DESCRIPTION
Control Functions
Reference clock
SM1125 series devices are available in external clock input versions and built-in RC oscillator versions, set by
master-slice option. In the case of the built-in RC oscillator option, an external resistor and capacitor is
required for the oscillator function.
SM1125 series can operate at 12 selectable reference clock frequencies. All melodies playback at the fixed
speed set by the reference clock frequency. External clock input versions operate at one of 12 selectable clock
frequencies, as shown in table 1. Built-in RC oscillator versions operate at one of 4 selectable oscillator fre-
quencies—32.768kHz, 37.5kHz, 38.4kHz (standard frequency) and 48.0kHz.
In external clock input versions, the external reference clock input is used during playback mode only and is
otherwise ignored. If a clock signal is input when not in playback mode (when ST is LOW), the gate circuit
switches to cutoff the external reference clock signal from entering the device, preventing unwanted current
flow.
In built-in RC oscillator versions, the oscillator is stopped when not in playback mode (when ST is LOW), pre-
venting unwanted current flow.
Table 1. Reference clock frequencies
Frequency
system
Selectable frequencies
32.768kHz
32.768kHz
65.536kHz
131.072kHz
37.5kHz
37.5kHz
75.0kHz
150.0kHz
38.4kHz
38.4kHz
76.8kHz
153.6kHz
48.0kHz
48.0kHz
96.0kHz
192.0kHz
Figure 1. External clock input version: Input during playback mode only
Figure 2. External clock input version: Input during non-playback mode
Figure 3. Built-in RC oscillator version
ST
OSC
ST
OSC
ST
OSC
CR
Oscillator


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