NKK SWITCHES LCD 64x32 User manual
LCD 64x32 Logic Boards User Manual
LCD 64x32 Logic Boards User Manual Rev H.docx
www.nkkswitches.com • engineering@nkkswitches.com
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LCD 64x32 Logic
Boards User Manual
Revision H
All Rights Reserved Worldwide
NKK Switches makes no warranty for the use of these products and assumes no responsibility for any errors,
which may appear in this document, nor does it make a commitment to update the information contained herein.
SmartDisplay is trademark of NKK Switches.
LCD 64x32 Logic Boards User Manual
LCD 64x32 Logic Boards User Manual Rev H.docx
www.nkkswitches.com • engineering@nkkswitches.com
Page 2 of 24
0423
TABLE OF
CONTENTS
Contents
1. What are Logic Boards?...........................................................................................................................3
2. Standard Part Numbers...........................................................................................................................3
3. Connectors.................................................................................................................................................4
4. How to Control Logic Board Mounted LCD 64x32 Switches ............................................................6
5. Board Dimensions ....................................................................................................................................8
6. Schematics ...............................................................................................................................................13
7. Key Terms & Definitions.......................................................................................................................19
Warranty......................................................................................................................................................20
LCD 64x32 Logic Boards User Manual
LCD 64x32 Logic Boards User Manual Rev H.docx
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1.What are Logic Boards?
Logic boards are switch panels that have glue logic to convert addressing and switch scanning to serial. A logic
board can be designed for any number of switches. Logic boards can be daisy-chained using a 14-pin ribbon
cable allowing for a variable number of switches to be controlled from one port of a controller. The daisy-chain
capability allows switches to be mounted at any desired location on a control panel. Switches/displays can be
soldered directly to the logic boards or mounted on sockets for removability.
2.Standard Part Numbers
The logic boards listed below are standard production parts. There are additional prototype boards that are not
listed. NKK Switches will work with customers to design and build custom logic boards in any desired
specification.
Item
Part# with
Socket and
switch
Part# with
switch
Description
1
IS-L02A1-CS
IS-L02A1-S
Logic Board, LCD 64x32 RGB, IS15EBFP4RGB, 2SW. Side by side
stackable
2
IS-L02G1-CS
IS-L02G1-S
LOGIC BOARD, 1x2, LCD 64x32 RGB, IS15EBFP4RGB-09YN,
2SW. Side by side stackable
3
IS-L02H2-CS
IS-L02H2-S
LOGIC BOARD, 1x2, LCD 64x32 RGB, IS15ESBFP4RGB, 2SW.
Side by side stackable
4
IS-L04G2-CS
IS-L04G2-S
LOGIC BOARD, 2x2, LCD 64x32 RGB, IS15EBFP4RGB-09YN,
4SW. Side by side stackable
5
IS-L16G2-CS
IS-L16G2-S
LOGIC BOARD, 4x4, LCD 64x32 RGB, IS15EBFP4RGB-09YN,
16SW. Side by side stackable
There is a signal booster for when too many logic boards are connected in a daisy-chain or when very long cables
are used for interconnecting.
Item
Part#
Description
1
IS-LBUF01
Signal booster for both LCD36x24 and LCD64x32
Note: Make sure the power is off when connecting or disconnecting logic boards to or from a
controller or each other.
Note: Connecting logic boards improperly could damage either/both the logic boards and
controller.
LCD 64x32 Logic Boards User Manual
LCD 64x32 Logic Boards User Manual Rev H.docx
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3.Connectors
The SmartDisplay controller connects to the J1 header of the first logic board via a 14-pin ribbon cable. The
J2 header of the first logic board connects to the J1 header of the second logic board and so on. The switch
numbering starts with switch one on the first logic board. The first switch of the next logic board will be one
number higher than the last switchof the previous logic board and so on.
Illustration 1, Logic board connections
Note: Attaching the ribbon cable without the red line on pin 1 on
each of the headers may cause damage to the controller or the
logic board.
Ribbon Cables
These cables are used for logic board connections. Custom length cables can be made to order.
Item
Part#
Length
Description
1
ISDCB81.2
1.2”
RIBBON CABLE, 14 CONDUCTORS, 28AWG, .050"
2
ISDCB83
3”
RIBBON CABLE, 14 CONDUCTORS, 28AWG, .050"
3
ISDCB88
8”
RIBBON CABLE, 14 CONDUCTORS, 28AWG, .050"
4
ISDCB812
12”
RIBBON CABLE, 14 CONDUCTORS, 28AWG, .050"
5
ISDCB824
24”
RIBBON CABLE, 14 CONDUCTORS, 28AWG, .050"
6
ISDCB836
36”
RIBBON CABLE, 14 CONDUCTORS, 28AWG, .050"
LCD 64x32 Logic Boards User Manual
LCD 64x32 Logic Boards User Manual Rev H.docx
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The logic boards have two connectors:
J1 Input port: 7x2 male header with 0.1” x 0.1” spacing.
This connector connects to a controller port or J2 of the previous logic board in the daisy chain.
Pin
Function
1
Din
Connected to Din of the first shift register
2
GND
Ground
3
CLK
Clock for all shift registers
4
GND
Ground
5
NC
6
Vsup
7V to 12V
7
LP
Latch all shift register outputs to all the drivers
8
NC
9
SCK
Clock of all SmartDisplays
10
NC
11
SDI
Data of all SmartDisplays
12
Vsup
7V to 12V
13
NC
14
SWRD
Switch Read bus for all SmartDisplays
J2 Output port: 7x2 male header with 0.1” x 0.1” spacing.
This connector connects to J1 of the next logic board in the daisy chain.
Pin
Function
1
Dout
Connected to Dout of the last shift register
2
GND
3
CLK
Connected to CLK of J1
4
GND
5
GND
6
Vsup
7V to 12V
7
LP
Connected to LP of J1
8
NC
9
SCK
Connected to SCK of J1
10
GND
11
SDI
Connected to SDI of J1
12
Vsup
7V to 12V
13
GND
14
SWRD
Connected to SWRD of J1
LCD 64x32 Logic Boards User Manual
LCD 64x32 Logic Boards User Manual Rev H.docx
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4.How to Control Logic Board Mounted LCD 64x32 Switches
If you are using NKK controllers, you can skip this section. This section covers details on how to control LCD
64x32 switches mounted on logic boards.
Please note the controller with the same port can control LCD 36x24 switches. If you want the same design to
have the capability to control both type of LCDs, please check the LCD 36x24 logic board user manual as some
of the indicated ground in the below table needs to be changed to meet LCD 36x24 logic board requirements.
Pin
J1 of the first
logic board
Controller connection
1
Din
Microcontroller pin (output)
2
GND
GND
3
CLK
Microcontroller pin (output)
4
GND
GND
5
NC
GND
6
Vsup
7V to 12V. Closer to 7V is better
7
LP
Microcontroller pin (output)
8
NC
GND
9
SCK
Microcontroller pin (output)
10
NC
GND
11
SDI
Microcontroller pin (output)
12
Vsup
7V to 12V. Closer to 7V is better
13
NC
GND
14
SWRD
Microcontroller pin (input) and 2K pull down
resistor to GND
Clock and data can be connected to SPI/UART mode 0 or any pin of a microcontroller. For SCK and SDI signals,
please refer to the application notes for LCD 64x32 switches.
Switch Numbering
On each logic board the first switch is in the upper left-hand corner and continues row by row with the last
switch in the lower right-hand corner. The switch numbering starts with switch one of the first logic board, then
the first switch of the next logic board will be one number higher than the last switch of the previous board.
LCD 64x32 Logic Boards User Manual
LCD 64x32 Logic Boards User Manual Rev H.docx
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0423
Selecting a Switch
The SS (Slave Select) of each switch is connected to the output of the latch driver. The input of the latch driver is
connected to the serial to parallel shift register. One bit is shifted for each switch using Din and CLK. The last bit
shifted will be for switch #1.
To select a switch for communication, bits should be shifted using Din and CLK, so all the switches have a high
bit, except the communication target switch, then toggle the LP of that switch that gets selected. The
communication to the switch is done via SCK and SDI. After communication to the switch is ended, all high bits
are shifted via Din and CLK for all the switches, and LP is toggled so no switch is selected.
Switch Scan
One terminal of each switch is connected to the SWRD (switch read). The output of the serial to parallel
shift register is connected to another switch terminal via a diode. Four bits are shifted for each switch using
Din and CLK. The third bit of the 4 bits shifted is used for the switch scan. The last 4 bits shifted will be for
switch #1.
Switch scan is accomplished by sending low bits via Din and CLK for all the switches except the switch being
scanned, then the SWRD is checked. If the SWRD is low, the switch is not pressed. If the SWRD is high, the
switch is pressed. The switch scans should be more than 10ms apart to prevent de-bouncing reads, and less than
80ms to prevent missing a read.
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