ML9222 データシートの表示（PDF） - Oki Electric Industry

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ML9222

32-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, ADC and Keyscan

Oki Electric Industry 

¡ Semiconductor

FEDL9222-02

ML9222

The rotary encoder switch function.

As figure 1 shows, the rotary encoder switch circuit is consisted of Phase detection, Interrupt

generation, Up/down counter, Direction latch and Parallel-in serial-out shift register.

A

B

Phase Detection

UP DOWN

Interrupt

Generation

for INT

UP/DOWN Counter

Q3 Q2 Q1

Direction Latch

R1

P-in/S-out Shift Registor

Output data

Fig.1 The Rotary Encoder Switch Circuit

1) Phase detection

1-1) Clockwise

The input A and B have a chattering absorption circuit of 620ns (typ.). When signal A and B input

as fig. 2, the phase detection circuit outputs UP signal after the chattering absorption period. At

this time, the output INT also goes to high level, so this signal can be used as an interrupt. The

INT stays High level until the switch data-output mode is selected.

A

chattering absorption time

B

UP (internal)

INT

Fig.2 The Input and Output Timing in Case of Clockwise.

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