LC75700T View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LC75700T

Key Scan IC

SANYO -> Panasonic 

LC75700T

Example: When control data “KP1 and KP2 = 0, KC1 to KC5 = 0, KC6 = 1” are executed.

(i.e.key scanning with only KS6 high.)

[L] KS1

[L] KS2

[L] KS3

[L] KS4

[L] KS5

[H] KS6

KI1

KI2

KI3

KI4

KI5

When any one of these keys is pressed, the

oscillator on the OSC pin is started and the

keys are scanned.

*3

*3. These diodes are required to reliabled recognize multiple key presses of keys on the KS6 line when state with

only KS6 high, as in the above example. That is, these diodes prevent incorrect operations due to sneak currents

in the KS6 key scan output signal keys on the KS1 to KS5 lines are pressed at the same time.

Key input

(KS6 line)

Key scan

615T[s]

CE

Serial data transfer Serial data transfer

DI

615T[s]

Key address (63H) Serial data transfer

Key address

1

T= fosc

DO

Key data read

Key data read

Key data read request

Key data read request

Multiple Key Presses

Although this LSI is capable of key scanning without inserting diodes for dual key presses, triple key presses on the

KI1 to KI5 input pin lines, or multiple key presses on the KS1 to KS6 output pin lines, multiple presses other than these

cases may result in keys that were not pressed recognized as having been pressed. Therefore, a diode must be inserted

in series with each key.Applications that do not recognize multiple key presses of three or more keys should check the

key data for three or more 1 bits and ignore such data.

No. 7632-11/16

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