ML22Q54 OKI [OKI electronic componets], ML22Q54 Datasheet - Page 22

• Manufacturer Part Number: ML22Q54
• Description: 2-Channel Mixing Oki ADPCM Algorithm-Based Speech Synthesis LSI
• Manufacturer: OKI [OKI electronic componets]

Power Down Function
In power down state, the power down function in the device stops the internal operation and oscillation, sets
AOUT to GND, and minimizes the static Idd.
When an external clock is in use, input “L” level to the XT pin, so that current does not flow into the oscillation
circuit.
Figure below shows the equivalent circuit of XT and XT pins.
Channel Status
Channel status is of 2 types: NCRn and BUSYn.
NCRn = “H” indicates that it is possible to input the PLAY, START and MUON commands for the phrase to be
played back next for channel n.
BUSYn = “H” indicates a state in which channel n has not performed voice processing. BUSYn = “L” indicates a
state in which channel n is performing voice processing.
Meanwhile, after a command is input, the NCR and BUSY signals of all channels are at “L” level during the
processing of the command.
OKI Semiconductor
RESET
Channel
XT
CH1
CH2
1 M approx.
XT
NCR1
NCR2
Channel status
To master clock inside the device
BUSY1
BUSY2
ML2252/54-XXX, ML22Q54
FEDL2250DIGEST-01
22/31