TECHNICAL DATA
LED Driver IC
Description
IK2108A
The IK2108A are anode-grid LED display drives 5.0V~18.0V with output size – 8 digits x
14 segments to 12 digits x 10 segments and addition key scan function.
Serial interface provides connection with microprocessor.
Features
• Operation voltage for digital part: 3.0V ~ 5.5V
• Operation voltage for output LEDs: 5.0V ~ 18.0V
• 7-step individual dimming control for each grid
• OSC: built in (with external resistor) 500kHz @ R=12.1kΩ
• Pulse segment current: 27mA @ 8 digits x 14 segments
39mA @ 12 digits x 10 segments
• Key scanning: 10x3 matrix
• Serial Interface
• Operation Temperature : -40 ~ 85°C
Application
• Washing machine,refregerator, microwave oven, conditioner and other
SOP-32
LQFP-32
ORDERING INFORMATION
Device
IK2108ADW
IK2108ADWT
IK2108ALQ
Operating
Temperature Range
T
A
= -40 to 85 C
Package
SOP 32
SOP 32
LQFP-32
Shipping
Tube
Tape&Reel
Tape&Reel
Pin Description IK2108A (32Pins)
RCUR
DI/O
CLK
STB
K1
K2
K3
VDD
GND
SG1/KS1
SG2/KS2
SG3/KS3
SG4/KS4
SG5/KS5
SG6/KS6
SG7/KS7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
GR1
GR2
GR3
GR4
GR5
GR6
GR7
GR8
VCC
SG14/GR9
SG13/GR10
SG12/GR11
SG11/GR12
SG10/KS10
SG9/KS9
SG8/KS8
IK2108A
28
27
26
25
24
23
22
21
20
19
18
17
1
May 2012, Ver. 03
IK2108A
Pin №
Pin Name
I/O
Description
SOP-32
LQFP-
32
30
RCUR
I/O
A resistor is connected to this pin to determine the output
currents and oscillation frequency.
Data Input - Output Pin
This pin inputs serial data at the rising edge of the shift clock
(starting from the bit)
Data Output Pin - N-Channel, Open-Drain
This pin outputs serial data at the falling edge of the shift clock
Clock Input Pin
This pin reads serial data at the rising edge and output data at
the falling edge.
Serial Interface Strobe Pin
The data input after the STB has fallen is processed as a
command.
When this pin is HIGH, CLK is ignored.
Key Data Input Pins
The data sent to these pins are latched at the end of the display
cycle. (Internal Pull-Up Resistor)
Power Supply for Digital Part
Power Supply for Output Part
Segment Output Pins (N-channel open drain)
Also acts as the Key Source
Segment / Grid Output Pins
Grid Output Pins (P-Channel, Open Drain)
Ground Pin
1
DI/O
I/O
2
31
CLK
I
3
32
STB
I
4
1
K1 to K3
VDD
VCC
SG1/KS1 to
SG10/KS10
SG11/GR12 to
SG14/GR9
GR8 to GR1
GND
I
-
-
O
O
O
-
5-7
8
24
10-19
20-23
25-32
9
2-4
5
21
7-16
17-20
22-29
6
BLOCK DIAGRAM
Control
DI/O
CLK
STB
Serial
Data
Interface
Display
Memory
OSC
Timing
Generator
Segment
Driver/
Key Scan
Output/
Grid
Driver
Dimming
Circuit
RCUR
R
GND
Current
Reference
Key Matrix
Memory
Voltage
Reference
SG1/KS1
SG2/KS2
SG3/KS3
SG4/KS4
SG5/KS5
SG6/KS6
SG7/KS7
SG8/KS8
SG9/KS9
SG10/KS10
SG11/GR12
SG12/GR11
SG13/GR10
SG14/GR9
GR8
GR7
GR6
GR5
GR4
GR3
GR2
GR1
K1 K2 K3
VDD VCC GND
2
May 2012, Ver. 03
IK2108A
INPUT / OUTPUT CONFIGURATIONS
The schematic diagrams of the input and output circuits of the logic section are shown below.
Input Pins: CLK, STB
VDD
GND
Input Pins: K1, K2, K3
Output Pins: GR1 to GR8
3
May 2012, Ver. 03
IK2108A
Output Pins: SG1/KS1 to SG10/KS10
GND
Output Pins: SG11/GR12 to SG14/GR9
Input-Output Pin: DI/O
4
May 2012, Ver. 03
IK2108A
FUNCTIONAL DESCRIPTION
Commands
A command is the first byte (b0 to b7) inputted to IK2108A via DI/O Pin after STB Pin has changed
from ”HIGH” to “LOW” state. If for some reason the STB Pin is set “HIGH” while data or commands
are being transmitted, the serial communication is initialized, and the data commands being
transmitted are considered invalid.
COMMAND 1: DISPLAY MODE SETTING COMMANDS
IK2108A provides 5 display modes setting as shown in the diagram below. As stated earlier a
command is the first one byte (b0 to b7) transmitted to IK2108A via the DI/O Pin when STB is “LOW”.
However, for these commands, Bit 5 to Bit 8 (b4 to b7) are given a value of “0”.
The Display Mode Setting Commands determine the number of segments and grids are used (14 to
10 segments, 8 to 12 grids). A display commands “ON” must be executed in order to resume display.
If the same mode setting is selected, no command execution is take place, therefore, nothing happens.
The Display Mode Setting Commands are also used to turn ON or OFF the display. Please refer to the
diagram below.
When the power is turned ON, the display is turned OFF (b3 is “0”) and the mode 111 is selected (b2
to b0 are “1”).
Display Mode Settings:
011: 12 Grids, (10 Segments)
100: 11 Grids, (11 Segments)
101: 10 Grids, (12 Segments)
110: 9 Grids, (13 Segments)
111: 8 Grids, (14 Segments)
5
May 2012, Ver. 03
MCU
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