ROHM BU8313K, BU8311KS, BU8310AK Datasheet

Communication ICs

Panel interface

BU8310AK / BU8311KS / BU8313K

The BU8310AK, BU8311KS, and BU8313K are large-scale integrated circuits for telephones, which enable a serial in­put/output interface between the key input required for telephone panel boards and LED control functions. They reduce
the number of wiring harnesses needed between the main board in the telephone and the panel board, and take some
of the processing load off the main CPU.

Applications
Telephones and cordless telephones

Features

1) Keypad matrix interface
Key input is output as 16-bit serial data.

1

Internal chattering prevention circuit built into the

2

key input circuit.

2) LED interface
LED control commands input as 16-bit serial data.

1

Bits with a pattern generator and pattern register

2

can be assigned three independent flashing pat­terns in addition to being lighted or off.
Power consumption can be reduced using RST

3

pin input.
LED on and off control can be initiated using ENA

4

pin input or by commands setting all LEDs valid or
invalid.

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Communication ICs BU8310AK / BU8311KS / BU8313K

Block diagram

278

Communication ICs BU8310AK / BU8311KS / BU8313K

279

Communication ICs BU8310AK / BU8311KS / BU8313K

FAbsolute maximum ratings (Ta = 25_C)

FRecommended operating conditions

FPin descriptions

280