ml2251 Oki Semiconductor, ml2251 Datasheet - Page 25

• Manufacturer Part Number: ml2251
• Description: 2-channel Mixing Oki Adpcm Algorithm-based Speech Synthesis Lsi
• Manufacturer: Oki Semiconductor

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.
Initial state at the reset input
At the reset input, status of each output pins is described in the table below.
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
Output pin
BUSY1
BUSY2
NCR1
NCR2
Channel
XT
CH1
CH2
1 M Ω approx.
“H” level
“H” level
“H” level
“H” level
Status
XT
NCR1
NCR2
Channel status
Output pin
REGOUT
AOUT
To master clock inside the device
DAO
VBG
XT
BUSY1
BUSY2
Hi-z level
“L” level
“L” level
“L” level
“L” level
Status
FEDL2250DIGEST-06
ML2250 family
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