Casio SF-5600AR Specifications download pdf (Page 17)

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OFF

SWO

CPU

MAIN SWITCH

VDD

"L"

KAC

KIO

(Pin36)

(Pin62)

(Pin54)

(Pin53)

6) Main switch and power on switch

When the main switch is set to on position, SW terminal of CPU becomes "L", then CPU will send "L"

signal to KAC terminal to enable the system power on. The KI0 terminal is "H" when VDD is applied to

CPU. Therefore, when pressing the power on switch, CPU will generate a clock pulse (2 MHz) for start

up the system.

When the PDN terminal will be receiving "L" level, GATE ARRAY will send "L" signal from KON termi-

nal for cutting the line of power on switch.

HD62076C03

from IC4

(Pin35)

VOB

VIN

"L"

V2ON

CPU

GND

(Pin45)

(Pin24)

(Pin28) (Pin31)

When the system is start up, CPU will send "H" signal to VIN terminal of gate array from V2ON termi-

nal. Then, gate array will send "L" signal from VOB terminal to turn ON the transistor Q2 and Q1 for

LCD drive voltages.

HD62076C03

"H"

SSC2571F0A

GATE ARRAY

(Pin2)

(Pin1)

VR1

VDD

C20

V1~V4

(Pin3)

7) Power supply for LCD

PDN

GATE ARRAY

SSC2571F0A

KON

(Pin26)

(Pin3)

"L"

"H"

POWER ON SWITCH

4S66F

1 ... 16 17 18 ... 33

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Casio SF-5600AR Specifications Page 17

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