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SAM2655

1- MAIN FEATURES

The SAM2655 provides a new generation of integrated solutions for electronic musical

instruments. The SAM2655 includes all key circuitry into a single silicon chip:

- sound synthesizer/processor

- 16-bit control processor

- interface with keyboards, switches, sliders, LEDs, LCD display, etc

- audio CODEC

The synthesis/sound processing core of the SAM2655 is taken from the SAM2000

series, whose quality has already been demonstrated through a lot of different musical

products: E.Pianos, home keyboards, professional keyboards, classical organs, sound

expanders. The maximum polyphony is 64 voices without effects. A typical application

will be 38-voice polyphony with reverb, chorus, 4-band equalizer and surround.

The SAM2655 is directly compatible with most available musical keyboards. This

includes configuration options for spring or rubber type contacts, common anode or

common cathode type matrix. A 64 µs timing accuracy for velocity detection provides a

very reliable dynamic response even with low cost unweighted keyboards. The time

between contacts is coded with 256 steps on a logarithmic time scale, then converted

by software to a 128-step MIDI scale according to the type of keyboard and a selected

keyboard sensitivity.

The SAM2655 can handle directly up to 176 switches. Switches, organized in matrix

form, require only a serial diode. Up to 88 LEDs can be directly controlled by the

SAM2655 in a time multiplexed way. Additional LEDs can be connected through

additional external shift registers using the GPIO lines (general purpose I/O) of the

SAM2655. The built-in analog to digital converter of the SAM2655 allows connecting

continuous controllers like pitch-bend wheel, modulation, volume sliders, tempo sliders,

etc. Up to 16 sliders can be connected.

The SAM2655 can be directly connected to most LCD displays through an 8-bit

dedicated data bus and 3 control signals.

SAM2655

 Keyboards

 Switches

 Leds

 LCD display

 Sliders

 Midi in/out

 Serial flash

 Mike In

ROM

Typical Application

Audio OUT

(Stereo)