KIT 79879-3 Digital View, KIT 79879-3 Datasheet - Page 27

• Manufacturer Part Number: KIT 79879-3
• Description: Display Development Tools CONTR KIT SVH-1920 22.5"NL192120AC25-02
• Manufacturer: Digital View

Specifications of KIT 79879-3

• Product Category: Display Development Tools
• Rohs: yes

Design Guideline for making VR circuitry :
CNB1 – Backlight inverter connector: JST B5B-XH-A (Matching type : XHP-5)
CNC1 – Control switch, JST B12B-XH-A (Matching type : XHP-12)
Example for circuit design :
The VR for brightness depends on the inverter. The main power load for On/Off is handled by a relay on the controller.
1.)Choose RPOT = 10K
2.) Tie BVR_A to GND
3.) Circuit analysis gives BVR_WIP as the
following (see Figure 1)
BVR_WIP = 5 x (Rbc/10.47)
where BVR_WIP is in Volts.
And Rbc is the resistance from the wiper arm
to bottom of pot in Kohms.
To evaluate, plug in different values of Rbc :
So this circuit could provide Brightness
adjust voltage ranging from 0V to 5V.
PIN
PIN
2.5 K
7.5 K
10
11
12
10 K
1
2
3
4
5
Rbc
1
2
3
4
5
6
7
8
9
5 K
0
BVR_WIP
BVR_WIP
SYMBOL
SYMBOL
+/RIGHT
BLCTRL
SEL_DN
SEL_UP
SW_ON
BVR_A
PSWIN
BVR_A
BVR_B
-/LEFT
MENU
VBKL
GND
GND
NC
BVR_WIP
1.2 V
2.4 V
3.6 V
4.8 V
0 V
Signal description / Notes :
1) R1 : 470ohm on board
2) RPOT is an external potentiometer (in-line dip
style) that can be plugged directly into CNC1 pins
3,4,5. RPOT must be supplied / installed by user.
3) BVR_B : Voltage tapped from “top” of
potentiometer, the node of R1 and RPOT.
4) BVR_WIP : Voltage tapped from wiper arm of
RPOT.
5) BVR_A : Voltage tapped from “bottom” of
RPOT.
Note : BVR_A voltage is left floating on the
controller board. To use this circuit, you need
to tie this point to a potential (usually GND,
available at CNC1 pin 6).
Backlight Brightness VR pin B (470 ohm resistor to +5V Vcc)
27
On/Off control (enable) – see JB2 & JB3
+12V/24VDC, backlight power supply
Backlight Brightness R pin WIP
Backlight Brightness VR pin A
Brightness VR - WIP
OSD Select down
Brightness VR A
DESCRIPTION
DESCRIPTION
Power button A
Power button B
OSD Select up
No connection
OSD +/Right
OSD menu
OSD -/Left
Ground
Ground