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Description

The MSSI121/241/241B is an one time programmable CMOS VLSI ASIC that can memorize voice for 7-12 / 13-24 seconds using 6-bit MOSEL qualified coding method (MPCM). Most of the necessary circuit are built in like oscillator, ROM, DAC and interface logic. Versatile functions can be performed with minimum external components. Customer voice data will be edited and built in by MOSEL writer in an instant time base.

Features

■ Single power supply can operate at 2.4V through 6V.

■ Current output can drive 8 ohm speaker with a transistor, Vout can drive buzzer directly.

■ The voice content is stored for 7-12 seconds for SI121 ( 13-24 for SI241/241B ) including mute

■ and is single section / phrase and single trigger.

■ Automatic power down.

■ A phrase is composed of repetitive sections.

■ Interrupt function (INTP) stops the audio output at once.

■ An LED function with 3Hz flash is provided to tell the audio status.

■ Repeat pin was provided to keep audio output repeating.

■ Built-in power on play function and is programmable.

■ Programmable option for either Retrigger or not.

■ Programmable option for either Level or Edge trigger type.

■ Programmable option for either Holdable or Unholdable output type.

■ Programmable option for repeat times up to 8 times.

■ Programmable option for either LED display or STOP pulse on LED/STP pin.

■ SI121 can be programmed by MSM9159, MSM9156, MSM9140 & MSM9139.

■ SI241/241B can be programmed by MSM9159, MSM9140.

■ A STOP pulse comes out when audio signal is finished.

■ CDS input interface with 10ms debounce is provided for trigger pin, REP pin and INTP pin.