DM115B [SITI]
8-Bit CONSTANT CURRENT LED DRIVERS with 3.3v ~ 5v supply voltage; 8位恒流LED驱动器， 3.3V 〜5V电源电压
| 型号： | DM115B |
| 厂家： | 
SILICON TOUCH TECHNOLOGY INC. |
| 描述： | 8-Bit CONSTANT CURRENT LED DRIVERS with 3.3v ~ 5v supply voltage |
| 文件： | 总17页 (文件大小：234K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DM115B
Version
: A.001
Issue Date : 2007/02/07
File Name
: SP-DM115B-A.001
Total Pages : 17
8-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.
.
.
Tel
：
886-3-5645656
Fax：886-3-5645626
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
DM115B
8-Bit CONSTANT CURRENT LED DRIVERS with
3.3v ~ 5v Supply Voltage
General Description
The DM115B is the constant current driver specifically designed for LED display applications.
The value of constant current can be varied using an external resistor. The devices include an 8-bit
shift register, latches, and constant current drivers on a single Silicon CMOS chip.
Features
z
z
z
z
z
z
Maximum Output Voltage: 17V
Maximum Clock Frequency: 25MHz (Cascade Operation)
Power Supply Voltage:
CMOS Compatible Input
Package:
3.3V to 5.0V
PDIP16, SOP16, SSOP16
Package and Pin Layout:
Pin layout and functionality are similar to those of the ST2221A.
(Each characteristic value is different.)
z
Constant Current Matching: (Ta = 25°C、VDD = 5.0V)
Chip-to-Chip: ± 10.0%
Bit-to-Bit: ± 4.0% @ IOUT = 20 ~ 60mA
± 6.0% @ IOUT = 5 ~ 20mA
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 1
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Pin Connection (Top view)
VDD
GND
SERIAL-IN
CLOCK
LATCH
OUT0
1
2
3
4
5
6
7
16
15
14
13
12
11
10
9
R-EXT
SERIAL-OUT
ENABLE
OUT7
OUT1
OUT6
OUT2
OUT5
OUT4
OUT3
8
Block Diagram
OUT7
OUT1
OUT0
I-REG.
R-EXT
ENABLE
Q
Q
Q
ST
D
ST
D
ST
Q
D
LATCH
D
Q
D
Q
D
SERIAL-OUT
SERIAL-IN
CK
CK
CK
CLOCK
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 2
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Timing Diagram
3.3/5V
CLOCK
0V
3.3/5V
SERIAL IN
LATCH
0V
3.3/5V
0V
3.3/5V
0V
ENABLE
OUT0
OUT1
Off
On
Off
Off
OUT2
On
OUT7
Off
3.3/5V
0V
SERIAL-OUT
(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 (OUT0~7) 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.
Pin Description
PIN No.
PIN NAME
GND
SERIAL-IN
CLOCK
FUNCTION
1
2
3
GND terminal
Input terminal of a data shift register
Input terminal of a clock for shift register
Input terminal for data strobe
4
LATCH
5~12
13
14
15
16
OUT0~7
ENABLE
Output terminals
Input terminal for output enable (active low)
SERIAL-OUT Output terminal of a data shift register
R-EXT
VDD
Input terminal of an external resistor
3.3/5V Supply voltage terminal
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 3
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Equivalent Circuit of Inputs and Outputs
1. ENABLE terminal
2. LATCH terminal
VDD
VDD
RIN(up)
INPUT
INPUT
GND
RIN(down)
GND
3. CLOCK, SERIAL-IN terminal
4. SERIAL-OUT terminal
VDD
VDD
INPUT
GND
SERIAL_OUT
GND
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 4
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Maximum Ratings (Ta = 25°C, Tj(max) = 150°C)
CHARACTERISTIC
Supply Voltage
SYMBOL
VDD
RATING
0 ~ 7.0
UNIT
V
Input Voltage
VIN
-0.4 ~ VDD+0.4
V
Output Current
IOUT
60
mA
Output Voltage
VOUT
fCLK
-0.3 ~ 17
25
V
Clock Frequency
MHz
GND Terminal Current
Power Dissipation
IGND
500
mA
W
1.64 ( PDIP-16 : Ta=25°C)
1.08 ( SOP-16 : Ta=25°C)
0.8 ( SSOP-16 : Ta=25°C) single-layer
1.47 ( SSOP-16 : Ta=25°C) 4-layer
76 ( PDIP-16 )
PD
115 ( SOP-16 )
Thermal Resistance
Storage Temperature
Rth(j-a)
Tstg
°C/W
°C
155 ( SSOP-16 ) single-layer
85 (SSOP-16) 4-layer
-55 ~ 150
Recommended Operating Condition
CHARACTERISTIC SYMBOL
CONDITION
⎯
MIN.
3.0
⎯
TYP.
⎯
⎯
⎯
⎯
⎯
⎯
MAX.
UNIT
V
Supply Voltage
VDD
VOUT
TOPR
IO
5.5
17
Output Voltage
⎯
⎯
V
Operating temperature
-40
85
℃
OUTn
⎯
⎯
⎯
60
Output Current
Input Voltage
mA
V
IOH
SERIAL-OUT
SERIAL-OUT
1.0
-1.0
IOL
VIH
VIL
⎯
⎯
0.7VDD
⎯
VDD+0.3
0.3VDD
-0.3
⎯
LATCH Pulse Width
CLOCK Pulse Width
Set-up Time for DATA
Hold Time for DATA
tw LAT
tw CLK
15
15
10
5
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
ns
ns
VDD = 3.0 ~ 5.5 V
tsetup(D)
thold(D)
ns
ns
Set-up Time for LATCH tsetup(L)
15
⎯
⎯
⎯
⎯
ns
Clock Frequency
fCLK
PD
2 chips cascade operation
Ta = 85°C(PDIP-16)
Ta = 85°C(SOP-16)
Ta = 85°C(SSOP-16)
25
MHz
0.85
0.56
0.41
Power Dissipation
W
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 5
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Electrical Characteristics (VDD = 5.0 V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
Input Voltage “H” Level
Input Voltage “L” Level
Output Leakage Current
SYMBOL
VIH
CONDITION
MIN.
0.7VDD
GND
⎯
TYP.
⎯
⎯
⎯
⎯
⎯
⎯
⎯
MAX.
VDD
UNIT
V
⎯
⎯
VIL
0.3VDD
1.0
IOH
VOH = 17 V
uA
VOL
VOH
VOL
VOH
IOL = 1.0 mA, VDD=5V
IOH = -1.0 mA, VDD=5V
IOL = 1.0 mA, VDD=3.3V
IOH = -1.0 mA, VDD=3.3V
VOUT = 1.2V
⎯
4.6
0.4
⎯
0.4
⎯
Output Voltage ( S - OUT)
V
⎯
2.7
Output Current (Bit-Bit)
ΔIout
REXT = 780Ω
⎯
±1.5
±4
%
(1 channel on)
VOUT = 1.2V
(1 channel on)
Output Current
(Chip-Chip)
Iout
REXT = 780Ω
18.0
20.0
22.0
mA
Output Voltage Regulation
Pull-Up Resistor
% / Vout
RIN(up)
Vdd = 3.3V ~ 5.0V
⎯
200
100
⎯
0.1
400
200
5.0
0.5
600
300
⎯
% / V
KΩ
KΩ
⎯
⎯
Pull-Down Resistor
RIN(down)
REXT = OPEN, all outputs off
Idd (off)
VDD=5V
Supply Current “OFF”
Supply Current “ON”
Supply Current “OFF”
REXT = 300Ω, OUT0~7 = off
⎯
11.0
⎯
mA
mA
Idd (on)
VDD=5V
REXT = 300Ω, OUT0~7 = on
⎯
11.0
⎯
Idd (off)
REXT = OPEN, all outputs off
⎯
⎯
1.1
7.2
⎯
⎯
VDD=3.3V
REXT = 300Ω, OUT0~7 = off
Idd (on)
VDD=3.3V
REXT = 300Ω, OUT0~7 = on
⎯
7.2
⎯
Supply Current “ON”
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 6
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Switching Characteristics (Ta = 25 °C unless otherwise noted)
CHARACTERISTIC
SYMBOL
tpLH
CONDITION
VDD=5.0V
VIH=VDD
VIL=GND
REXT=630Ω
VL=5.0V
MIN.
⎯
TYP.
66
MAX.
132
UNIT
ns
Propagation
ENABLE-OUT0
CLK-SOUT
Delay Time
(“L” to “H”)
Propagation
Delay Time
(“H” to “L”)
⎯
16
20
ENABLE-OUT0
CLK-SOUT
⎯
⎯
81
16
162
20
ns
tpHL
RL=150Ω
CL=15pF
Output Current Rise Time
Output Current Fall Time
tor
tof
⎯
⎯
30
32
60
50
ns
ns
Note: (Delay between outputs)
The DM115B also incorporated the delay unit between outputs. The delay time is 4 ns(typ.), out7 has no delay,
out5 has 4 ns delay, out 3 has 8 ns delay, and then out 1, out 0, out 2, out 4, out6. The delay is to prevent large current
impulse.
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 7
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Test Circuit
DC characteristic
IDD
VDD
OUT0
ENABLE
IOL
CLOCK
LATCH
IIL ,IIH
OUT7
SERIAL-IN
R-EXT GND
VIL ,VIH
SERIAL-OUT
I ref
AC characteristic
RL
VDD
VIL ,VIH
OUT0
ENABLE
CLOCK
CL
SW-
LATCH
MATRIX
RL
CL
OUT7
SERIAL-IN
SERIAL-OUT
R-EXT GND
CL
VL
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 8
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Timing Diagram
1. CLOCK-SERIAL OUT, OUTn
tr
tf
twCLK
twCLK
90%
50%
10%
90%
50%
10%
50%
CLOCK
tsetup
thold
50%
50%
SERIAL-IN
tof
tor
90%
90%
50%
10%
50%
10%
OUTn (current)
tpLH
tpHL
50%
50%
SERIAL-OUT
tpHL
tpLH
2. CLOCK-LATCH
50%
CLOCK
SERIAL-IN
“L” level = DATA HOLD
tw(LAT)
50%
50%
LATCH
tsetup(L)
3. ENABLE-OUTn (Current)
ENABLE
50%
50%
tpHL
tpLH
50%
50%
OUTn
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 9
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Output Current vs. External Resistor
70
60
50
40
30
20
10
0
0
200 400 600 800 1000 1200 1400 1600 1800
Rext (Ohm)
Iout ≈ 1.3V / Rext * 12.5
Output Current Performance vs. Output Voltage
60
55
50
45
40
35
30
25
20
15
10
5
0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Vout (V)
1 1.1 1.2 1.3 1.4 1.5
Note: In order to obtain a good constant current output, a suitable output voltage is necessary. Users can get
related information about the minimum output voltage from the above graph.
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 10
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Pd - Ta
1.80
1.60
DIP
1.40
1.20
SOP
1.00
SSOP
0.80
0.60
0.40
0.20
0.00
0
20
40
60
80
Ta
100 120 140 160
Imax - Ta ( DM115 )
70
60
50
40
30
20
10
0
DIP
SOP
SSOP
0
20
40
60
80
Ta
100
120
140
160
Note
As the power dissipation of a semiconductor chip is limited its package and ambient temperature,
this device requires a maximum output current be calculated for a given operating condition. The
maximum allowable power consumption (Pd (max)) of this device is calculated as follows:
(Tj(junction temperature) (max) - Ta (ambient temperature) )(°C)
Pd(max)(Watt) =
Rth (°C /Watt)
Based on the Pd (max), the maximum allowable current can be calculated as follows:
Iout = ( Pd – VDD‧IDD) / ( # outputs‧Vo‧Duty )
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 11
Vo
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
System Configuration Example
[1] Output current (IOUT
)
Sink current is set by the external resistor as shown in figure (Iout vs. Rext).
[2] LED supply voltage (VLED) setup
VLED = VCE ( Tr Vsat ) + Vf ( LED forward voltage ) + VO ( IC supply voltage)
To prevent too much power dissipated by the device due to higher VLED , an additional R can
be used to reduce the Vout when the outputs consume current:
V L E D
= 3 ~ 4 (V )
V D D
S C A N
O U T 0
E N A B L E
C L O C K
L A T C H
R
O U T 7
S E R IA L -IN
S E R IA L -O U T
R -E X T G N D
C P U
O U T 0
E N A B L E
C L O C K
L A T C H
O U T 7
S E R IA L -IN
S E R IA L -O U T
R -E X T G N D
V
LED −V
(max)• Bit(max)
f
−V
O
(min)
R =
IO
Note
This device has only one ground pin shared by signal, output sink current, and power ground.
It is advisable to pattern the ground layout with minimized inductance such that the switching
noise induced by the input signals and the output sink current would not cause chip malfunction. To
prevent the drivers’ outputs from damage by overshoot stress, it is also advisable not to turn off the
drivers and scan transistors simultaneously.
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 12
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Package Outline
PDIP16
Unit: mm
16
9
8
1
19.69MAX
19.18±0.51
0.4572
1.524
2.54
0.635±0.254
Weight : 1.11g(Typ.)
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 13
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Package Outline
SOP16
Unit: mm
16
9
8
1
0.56
0.51
1.27
10
1.27
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 14
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
Package Outline
SSOP16
Unit: mm
9
16
8
1
0.229
0.3Max
0.635
4.9
0.635
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 15
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM115B
The products listed herein are designed for ordinary electronic applications, such as
electrical appliances, audio-visual equipment, communications devices and so on.
Hence, it is advisable that the devices should not be used in medical instruments,
surgical implants, aerospace machinery, nuclear power control systems,
disaster/crime-prevention equipment and the like. Misusing those products may
directly or indirectly endanger human life, or cause injury and property loss.
Silicon Touch Technology, Inc. will not take any responsibilities regarding the
misusage of the products mentioned above. Anyone who purchases any products
described herein with the above-mentioned intention or with such misused
applications should accept full responsibility and indemnify. Silicon Touch
Technology, Inc. and its distributors and all their officers and employees shall defend
jointly and severally against any and all claims and litigation and all damages, cost
and expenses associated with such intention and manipulation.
8-BIT CONSTANT CURRENT LED DRIVERS with 3.3V~5V supply voltage
Version:A.001
Page 16
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