Lcd Panel Control Circuit - Tripp Lite SU60KX Manual

2 Theory of Operation (continued)

2.11 LCD Panel Control Circuit

Located at NH-SYS-M board (System MCU and Control Circuit)
CONTRAST
LcdD0
(32)
LcdD2
(34)
LcdD4
(36)
LcdD6
(38)
CM 72 CM 73 CM 74
RM 126
KEY_ESC
ESC
G1
RM 133
KEY_DOWN
DOWN
G1
RM 140
KEY_OFF
OFF
G1
RM 147
KEY_UP
UP
G1
RM 152
KEY_ENT
ENT
G1
(a) MCU detects the status of EPO button (on LCD display panel) via "EPO" (85) (low active). When the EPO button is activated, UPS will shut
down the output and turn off the inverter. When the EPO button is released, UPS will stay in bypass mode.
(b) MCU can control the LCD backlight via "U-lcmBL" (62).
(c) MCU can adjust the contrast of LCD by PWM control via "U-lcmCA" (2).
TO LCD
CNM 5
VLED 1 2 VLED
LED0 3 4 LED1
LED2 5 6 LED3
LED4 7 8 LED5
OFF 9 10 ENT
ESC 11 12 UP
DOWN 13 14 BKLIT
NO+ 15 16 G1
17 18 LcdDATA
LcdWR 19 20 LcdCS
21 22
23 24
25 26
27 28
G1 29 30 G1
CM 75 CM 76
G1
KEY_ESC
(8)
U-LED0
(73)
CM 85 RM 127
U-LED1
(74)
U-LED2
(75)
U-LED3
(76)
U-LED4
(77)
U-LED5
(78)
CENTRAL_OK
(70)
KEY_DOWN
(9)
CM 91
RM 135
+12VS
U-LcmBL
(62)
KEY_OFF
(22)
RM 143
CM 96
5VS
KEY_UP
(10)
CM 103
RM 149
KEY_ENT
(7)
RM 154
CM 110
RM 155
(2) U-LcmCA
LcdD1
(33)
LcdD3
(35)
LcdD5
(37)
LcdD7
(39)
(50)
CM 77 CM 78 CM 79
(49)
UM 5
8 9
G1 GND COM
7 10
7B 7C LED0
6 11
6B 6C LED1
5 12
5B 5C LED2
4 13
4B 4C LED3
3 14
3B 3C LED4
(63)
2 15
2B 2C LED5
1 16
1B 1C BYP_OK
RM 134
BKLIT
RM 137
RM 138
QM 9
RM 139
G1 G1
RM 144
CM 121
RM 148
EPO
NO+
(85)
CM 104
G1
+12VS G1
CM 113
2
1
1 CONTRAST
3
CM 112
UM7A
LM324AD
G1 G1
59
S tan d-Alon e
LED 0 N ORM AL LED
LED 1 BYPAS S LED
LED 2 FAU LT LED
LED 3 BATTERY LED
LED 4 N C
LED 5 N C
RM 116
U-LcdDATA
LcdDATA
CM 67
ZDM 1
G1
RM 121
U-LcdCS
LcdCS
CM 80
ZDM 2
G1
RM 132
U-LcdWR
LcdWR
CM 90
ZDM 3
G1
HSM 1
1
HS
UM 10
+12VS VLED
RM 158
1 3
Vin +5V
CM 118
CM 120
G1
CM 119