Teledyne M300EM operation manual Keypad Decoder, Key-Depress-Detectcircuit

Models: M300E M300EM

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Theory of Operation

Teledyne API – Technical Manual - Model 300E Family CO Analyzers

KEYPAD DECODER

Each key on the front panel communicates with a decoder IC via a separate analog line. When a key is depressed the decoder chip notices the change of state of the associated signal; latches and holds the state of all eight lines (in effect creating an 8-bit data word); alerts the key-depress-detect circuit (a flip-flop IC); translates the 8-bit word into serial data and; sends this to the I2C interface chip.

KEY-DEPRESS-DETECT CIRCUIT

This circuit flips the state of one of the inputs to the I2C interface chip causing it to send an interrupt signal to the

CPU

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04288D DCN5752

Page 256
Image 256
Teledyne M300EM operation manual Keypad Decoder, Key-Depress-Detectcircuit