Ope-Pane Circuit - Citizen CL-E720DT Technical Manual

(4) Ope-pane circuit

The circuit consists of 1 LED (Green/Red), 4 switches (PAUSE, FEED, STOP and MENU) and
1 LCD.
The LCD is controlled by the signals send from the FPGA (U5). The backlight of LCD is
controlled by LCD/BKL-WHITE and LCD/BKL-ORANGE signals sent from the CPU (U1A).
The signals output from the switches are sent to the CPU.
The LED controlling signals are sent from the CPU and fed to the LED D201 via Q4 and Q5,
and the green LED (for power display) and red LED (for error display) are driven, respectively.
LCDDAT
LCDSCK
From
LCDCD
U5 (FPGA)
nLCDRST
nLCDCS
LCD/BKL_WHITE
LCD/BKL_ORANGE
nSW0
nSW1
To/From
nSW2
U1A (CPU)
nSW3
LED0_G
LED1_R
* In power saving mode, +3VIO and +5VIO are not supplied. For details refer to
Power supply
+3VIO
+5VIO
Q4
DTC114TM
Q5
DTC114TM
[SA Main PCB]
circuit".
BL-W
J3 J201
1
1
+3VIO
2
2
+5VIO
3
3 LCD/SI
4 4 LCD/SCLK
LCD/CD
5 5
4 4
6
6
LCD/RST
7 LCD/nCS
7
LCD/BL-W
8
8
LCD/BL-O
9
9
10 10
SW/PAUSE
11
11 SW/FEED
12
12
SW/STOP
13
13
SW/MENU
14
14 LED/GREEN
LED/RED
15 15
16 16
17 17
[SA Opepane PCB]
2-29
Chapter 2 Operating Principles
2-2.
Operation of Control Parts
+5VIO
PAD201
Q201
Anode
R208
DTC114EM
PAD202
Cathode
(White)
PAD203
BL-O
Cathode
Q202
(Orange)
DTC114EM
+3VIO
J202
LCD
SW202
PAUSE
SW201
FEED
SW203
STOP
SW204
MENU
+5VIO
LED
R209
Green (Power)
R210
Red (Error)
D201
"2-2-6(1)
LCD
Backlight
CL-E720DT