LC75700T View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LC75700T

Key Scan IC

SANYO -> Panasonic 

LC75700T

3. Output pin states during a reset

Output pins

State during a reset

KS1 to KS3

L

KS4/P4 to KS6/P2

L

P1

L

DO

H *4

*4. Since this output pin is an open-drain output, a pull-up resistor of between 1 and 10 kΩ is required. This pin remains high during the reset period even if a

key data read operation is performed.

Sample Application Circuit

+5 V

VDD

OSC

P1

VSS

(P1)

(P2) (General-purpose output ports)

(P3)

Used with the backlight

(P4)

controller or other circuit.

From the controller

To the controller

To the controller

power supply

*6

RES *5

CE

CL

DI

DO

KS6/P2

*7 KS5/P3

KS4/P4

KS3

KS2

KS1

KI5

KI4

KI3

KI2

KI1

Key matrix

(up to 30 keys)

Note:*5. When the power is first applied, it must be initialized by RES = "L".

*6. The DO pin,being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 and 10 kΩ) appropriate

for the capacitance of the external wiring so that signal waveforms are not degraded.

*7. Each of The KS4/P4 to KS6/P2 pins must be set to either the key scan output port or the general-purpose output port.

No. 7632-13/16

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