DM134B
、
DM135B
Version
:
A.001
Issue Date
:
2004/4/29
File Name
:
SP-DM134B,135B-A.001.doc
Total Pages:
18
16-Bit Constant Current LED Drivers with
3.3v ~ 5v Supply Voltage
新竹市科學園區展業一路
9
號
7
樓之 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park,
Hsin-Chu, Taiwan 300, R.O.C.
Fax：886-3-5645626
Tel：886-3-5645656
點晶科技股½有限公司
SILICON TOUCH TECHNOLOGY INC.
DM134B
、
DM135B
DM134B、DM135B
、
16-Bit Constant Current LED Drivers with
3.3v ~ 5v Supply Voltage
General Description
The DM134B、DM135B are constant current drivers specifically designed for LED display
applications. The value of constant current can be varied using an external resistor. The devices
include a 16-bit shift register, latches, and constant current drivers on a single Silicon CMOS
chip.
Features
3.3V~5V CMOS Compatible Input
Maximum Clock Frequency: 25MHz (Cascade Operation)
Maximum Output Voltage: 17V
Package:
DIP24, SOP24, SSOP24, QFN32
Package and Pin Layout:
Pin layout and functionality are similar to those of the ST2221C.
(Each characteristic value is different.)
Constant Current Matching: (Ta = 25°C、V
DD
= 5.0V)
Chip-to-Chip:
±
10.0%
Bit-to-Bit:
DM134B:± 4.0% @ I
OUT
= 30 ~ 90mA
±
6.0% @ I
OUT
= 20 ~ 30mA
DM135B:± 4.0% @ I
OUT
= 20 ~ 60mA
±
6.0% @ I
OUT
= 5 ~ 20mA
16-Bit Constant Current LED Drivers
-1-
Version
：
A.001
Preliminary
點晶科技股½有限公司
SILICON TOUCH TECHNOLOGY INC.
DM134B
、
DM135B
Pin Connection
(Top view)
DIP24、SOP24、SSOP24
GND
SERIAL-IN
CLOCK
LATCH
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
DD
R-EXT
SERIAL-OUT
ENABLE
OUT15
OUT14
OUT13
OUT12
OUT11
OUT10
OUT9
OUT8
Pin Connection
(Bottom view)
QFN32
ENABLE
OUT13
26
SERIAL_OUT
OUT14
OUT12
24
23
22
21
20
19
18
17
16
25
OUT15
28
REXT
GND
27
29
30
31
32
OUT11
OUT10
OUT9
OUT8
OUT7
OUT6
OUT5
OUT4
1
2
3
GND
GND
VDD
VDD
GND
GND
GND
GND
Thermal PAD
4
5
6
7
15
14
13
12
11
10
8
9
16-Bit Constant Current LED Drivers
OUT3
OUT2
OUT1
Preliminary
OUT0
GND
LATCH
SERIAL_IN
CLOCK
-2-
Version
：
A.001
點晶科技股½有限公司
SILICON TOUCH TECHNOLOGY INC.
DM134B
、
DM135B
Block Diagram
OUT0
R-EXT
I-REG.
OUT1
OUT15
ENABLE
Q
ST D
Q
ST D
Q
ST D
LATCH
SERIAL-IN
CLOCK
D
CK
Q
D
CK
Q
D
CK
Q
SERIAL-OUT
Timing Diagram
16
Clocks
CLOCK
SERIAL_IN
LATCH
ENABLE
SERIAL_OUT
OUT0
OUT1
OUT2
OUT3
5V
0V
5V
0V
5V
0V
5V
0V
Previous Data
5V
0V
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OUT13
OUT14
OUT15
ON
OFF
ON
OFF
ON
OFF
(Note) Latches are level sensitive (not edge triggered).
LATCH-terminal = H level, latches become transparent; LATCH-terminal = L level, latches hold data.
ENABLE-terminal = H level, all outputs (OUT0~15) are off.
An external resistor is connected between R-EXT and GND for setting up the value of constant current.
SERIAL-OUT changes state on the rising edges of clock.
16-Bit Constant Current LED Drivers
-3-
Version
：
A.001
Preliminary
點晶科技股½有限公司
SILICON TOUCH TECHNOLOGY INC.
DM134B
、
DM135B
Pin Description
PIN No.
1
2
3
4
5~20
21
22
23
24
PIN NAME
GND
SERIAL-IN
CLOCK
LATCH
OUT0~15
ENABLE
SERIAL-OUT
R-EXT
V
DD
FUNCTION
Ground terminal
Input terminal of a data shift register
Input terminal of a clock for shift register
Input terminal of data strobe
Output terminals
Input terminal of output enable (active low)
Output terminal of a data shift register
Input terminal of an external resistor
5V Supply voltage terminal
Equivalent Circuit of Inputs and Outputs
1. ENABLE terminal
V
DD
RIN (up)
2. LATCH terminal
V
DD
ENABLE
LATCH
RIN
GND
GND
3. CLOCK, SERIAL-IN terminal
V
DD
4. SERIAL-OUT terminal
V
DD
CLOCK,
SERIAL-IN
SERIAL-OUT
GND
GND
16-Bit Constant Current LED Drivers
-4-
Version
：
A.001
Preliminary
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