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W681307 Datasheet, PDF (48/160 Pages) Winbond – USB1.1 CODEC Microprocessor Control Unit with 32KB Mask ROM and 4KB RAM | |||
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W681307
8.4
PIEZO Tone Generator
8.4.1
Overview
The PIEZO signal can generated by the Ringer Tone generator, this subsection describe the PIEZO-driving clock from the Ringer tone
generator, shown in Figure 8-4.
8.4.2
Functionality
VCC
PCM1/RT0
INDUCTOR
R
DIODE
C
R
Piezo
R
SNDR
Figure 8-4 Piezo tone circuit
The PCM1/RTO pin generates the driving signal to obtain higher voltage. When set register 0x144B[0], will enable the functionality of
Piezo, 0x144B[1] select the frequency of 108KHz or 216KHz for driving signal. The register 0x144C[7:0] output the twice number of
clock for up conversion the voltage. The Soundertone and SounderVol register controls the melody of piezo.
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Publication Release Date: May, 2007
Revision 1.3
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