ml2216 Oki Semiconductor, ml2216 Datasheet - Page 28

• Manufacturer Part Number: ml2216
• Description: Oki Adpcm2 Algorithm-based Speech Synthesis Lsi
• Manufacturer: Oki Semiconductor

3. PDWN1 Command
The PDWN1 command is used to shift the ML2216 from command standby state (both NCR and BUSY are “H”) to
the power down state.
To resume speech synthesis processing after the ML2216 has shifted to the power down state, first input the PUP1 or
PUP2 command and then input the PLAY command.
After PDWN1 command input and after an elapse of the PDWN1command processing time, the oscillation stops
and the AOUT output abruptly changes from 1V level to GND level. This abrupt change in the AOUT output will
cause to generate pop noise if the AOUT output is not processed outside. To suppress pop noise, input the PDWN2
command.
Regulator and speaker amplifier output stop operation After PDWN1 command input and after an elapse of the
PDWN1command processing time. At this time, SPP output will be in a “Hi-Z” state in order to prevent a pop noise.
OKI Semiconductor
• command
status
REGO
VBG·SG
AOUT
BUSY
XT·XT
0
NCR
SPM
SCK
SPP
CS
DI
0
1
Command
standby
0
Oscillating
−
−
Processing
command
1V
1/2VDD
1/2VDD
−
−
Power down
Oscillation
stopped
GND
GND
GND
Hi-Z
ML2216/ML22P16
FEDL2216FULL-03
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