ml2216 Oki Semiconductor, ml2216 Datasheet - Page 37

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

11. SPKR Command
SPKR command is used to power down control of speaker amplifier.
When PD bit is the “L” level, speaker amplifier is in a power up state.
When OP bit is the “L” level, it will be in a power up state through the stable time for about 2ms.
When OP bit is the “H” level, it will be in a power up state through the stable time for about 66ms.
However, when the ML2216 is changed into a power down state with PDWN1 and PDWN2 command, speaker
amplifier will also be in a power down state.
When PD bit is the “H” level, speaker amplifier is in a power down state. Speaker amplifier holds a power down
state until it changes PD bit into the “L” level with the SPKR command again, even if it will be in a power up state
with PUP1 and PUP2 command.
After reset release, PD bit and OP bit are set as the state of the “L” level.
Irrespective of OP bit, when PD bit is the “L” level, it will be in a power down state through command processing
time.
The SPKR command can input only NCR=”H” and BUSY=” H”. Note that SPKR command input during power
down, shifting to power up, and shifting to power down will be ignored.
Speaker amplifier power up timing ( at PD bit = “0” )
At OP bit = “0”
OKI Semiconductor
• command
status
BUSY
XT·XT
NCR
SPM
SCK
SPP
CS
SG
1
DI
VOH
VOH
VOL
VOL
GND
Hi-Z
GND
0
Command standby
1
1
−
Oscillating
Suppressing
pop noise
−
t
PUP1
OP
1/2VDD
1/2VDD
PD
Command
standby
ML2216/ML22P16
FEDL2216FULL-03
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