CF1155 series

NIPPON PRECISION CIRCUITS—3

FUNCTIONAL DESCRIPTION

Melody Modes

The CF1155 series melody mode is determined by the bonding options and levels on the mode control inputs

shown in the following table.

Level hold 1

When both OSH and LH go HIGH, melody play starts and continues while both are held HIGH. When both

inputs go open circuit or LOW, melody play stops, even if during mid melody.

Note that both OSH and LH inputs should be switched simultaneously using a single switch. If there is timing

difference between the two inputs, then LH has priority.

O S H

L H

Melod y mode

HIGH

HIGH

L evel hold 1

L O W

HIGH

L evel hold 2

HIGH

L O W

One-shot

L O W

L O W

Non-play

1 TUNE

Oscillator

REPEAT

REPEAT

OUT

LH

OSH

500k

Ω

135k

Ω

135k

Ω

Pull-down resistance

(2-pin parallel resistance)