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 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, MSM9141S, MSM9140 & MSM9139.
■ 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.