LC75886PWH-H Datasheet LC75886PWH-H, LC75886PW-H | P25-P27

LC75886PW

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25

3. Pin states during the reset period

Pin State during reset

S1/P1 to S4/P4 L *5

S5 to S53 L

COM1 to COM3 L

COM4/S54 L *6

KS1/S55, KS2/S56 L *5

KS3 to KS6 L *7

P5/S57 L *8

OSC Z *9

DO H *10

Note: *5. These output pins are forcibly set to the segment output function and held low.

*6. This output pin is forcibly set to the common output function and held low.

*7. These output pins are forcibly held fixed at the low level.

*8. This output pin is forcibly set to the general-purpose output port function and held low.

*9. This I/O pin is forcibly set to the high-impedance state.

*10.Since this output pin is an open-drain output, a pull-up resistor of between 1 and 10 k is required. This

pin remains high during the reset period even if a key data read operation is performed.

Notes on the OSC Pin Peripheral Circuit

1. RC oscillator operationg mode (Control data bit OC = 0)

When RC oscillator operationg mode is selected, an external resistor R

OSC

and an external capacitor C

OSC

must be

connected between the OSC pin and GND.

2. External clock operating mode (Control data bit OC = 1 )

When selecting the external clock operating mode, connect a current protection resistor Rg (4.7 to 47 k) between

the OSC pin and the external clock output pin (external oscillator). Determine the value of the resistance according to

the maximum allowable current value of the external clock output pin. Also make sure that the waveform of the

external clock is not excessively distorted.

OSC

External clock output pin

Rg

External oscillator

Note: Allowable current value at external clock output pin 

V

DD

Rg

OSC

C

OSC

R

OSC

LC75886PW

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26

Sample Application Circuit 1

1/4 duty, 1/3 bias (for use with normal panels)

Note: *11. Add a capacitor to the power supply line so that the power supply voltage V

DD

rise time when power is

applied and the power supply voltage V

DD

fall time when power drops are both at least 1 ms, as the

LC75886PW is reset by the V

DET

.

*12. If the

RES

pin is not used for system reset, it must be connected to the power supply V

DD

.

*13. When RC oscillator operating mode is used, the external resistor R

OSC

and the external capacitor C

OSC

must be connected between the OSC pin and GND, and when external clock operating mode is selected the

current protection resistor Rg (4.7 to 47 k) must be connected between the OSC pin and the external clock

output pin (external oscillator). (See the section on the OSC pin peripheral circuit.)

*14. The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 to 10 k)

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

*15. The pins to be connected to the controller (CE, CL, DI, DO,

RES

) can handle 3.3 V or 5 V.

Used with the

backlight controller

or other circuit.

C0.047F

To the controller

From the

controller

+5V

*11

C

*14

V

DD

S53

S54/COM4

S5

P4/S4

P2/S2

P1/S1

COM3

(P2)

(P3)

(S55)

(S56)

P5

COM1

OSC

COM2

DO

DI

CL

*12

Key matrix

(up to 30 keys)

RES

CE

V

DD

1

V

DD

2

TEST

V

SS

S

5

6

/

K

S

2

S

5

/

K

S

1

K

S

3

K

S

4

K

I

1

K

I

2

K

I

3

K

I

4

K

I

5

(Genenal-purpose

output port

)

LCD panel (up to 224 segments)

K

S

5

K

S

6

C

*13

P3/S3

(P4)

(P1)

*15

P5/S57

(S57)

To the controller

power supply

LC75886PW

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27

Sample Application Circuit 2

1/4 duty, 1/3bias (for use with large panels)

Note: *11. Add a capacitor to the power supply line so that the power supply voltage V

DD

rise time when power is

applied and the power supply voltage V

DD

fall time when power drops are both at least 1 ms, as the

LC75886PW is reset by the V

DET

.

*12. If the

RES

pin is not used for system reset, it must be connected to the power supply V

DD

.

*13. When RC oscillator operating mode is used, the external resistor R

OSC

and the external capacitor C

OSC

must be connected between the OSC pin and GND, and when external clock operating mode is selected the

current protection resistor Rg (4.7 to 47 k) must be connected between the OSC pin and the external clock

output pin (external oscillator). (See the section on the OSC pin peripheral circuit.)

*14. The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 to 10 k)

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

*15. The pins to be connected to the controller (CE, CL, DI, DO,

RES

) can handle 3.3 V or 5 V.

TEST

V

SS

+5V

C

R

V

DD

1

V

DD

2

V

DD

*11

10kR1k

C0.047F

To the controller

From the

controller

*14

S53

S54/COM4

S5

P4/S4

P2/S2

P1/S1

COM3

(P2)

(P3)

(S55)

(S56)

P5

COM1

OSC

COM2

DO

DI

CL

*12

Key matrix

(up to 30 keys)

RES

CE

S

5

6

/

K

S

2

S

5

/

K

S

1

K

S

3

K

S

4

K

I

1

K

I

2

K

I

3

K

I

4

K

I

5

Used with the

backlight controller

or other circuit.

(Genenal-purpose

output port)

LCD panel (up to 224 segments)

K

S

5

K

S

6

*13

P3/S3

(P4)

(P1)

*15

P5/S57

(S57)

To the controller

power supply

LC75886PWH-H

LC75886PWH-H

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