SITI DM11A

DM11A
Version
: A.003
Issue Date : 2008/03/10
File Name : SP-DM11A-A.003.doc
Total Pages : 20
8-bit Constant Current LED Driver
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.
DM11A
DM11A
8-bit Constant Current LED Driver
General Description
DM11A is a constant-current sink driver specifically designed for LED display applications.
The device incorporates shift registers, data latches, and constant current circuitry on the silicon
CMOS chip. The maximum output current value of all 8 channels is adjustable by a single external
resistor.
Features
z
Constant-current outputs: 3mA to 60mA adjustable by one external resistor
z
Maximum output voltage: 17V
z
Maximum clock frequency: 25MHz
z
Power supply voltage: 3.3V to 5V
z
In-rush current control
z
Output slew rate control (Tr/Tf, over/under shoot)
z
Bit-to-bit skew : ± 3 % (max.)
z
Package and pin assignment compatible to conventional LED drivers (DM114/5/6)
Chip-to-chip skew : ± 6 % (max.)
Applications
z
Indoor/Outdoor LED Video Display
z
LED Variable Message Signs (VMS) System
Package Types
z
PDIP16, SOP16, SOP16B, SSOP16
8-bit Constant Current LED Driver
Version:A.003
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Page 1
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Block Diagram
OUT 0
OUT 1
OUT 7
Delay Unit
[0]
Delay Unit
[1]
Delay Unit
[7]
VDD
GND
EN
Constant-current Constant-current
Constant-current
Driver [0]
Driver [1]
Driver [7]
LAT
Latch Register
[0]
Latch Register
[1]
Latch Register
[7]
DAI
Shift Register
[0]
Shift Register
[1]
Shift Register
[7]
REXT
DAO
DCK
8-bit Constant Current LED Driver
Version:A.003
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Page 2
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Pin Connection
Pin Description
PIN No.
PIN NAME
1
GND
Ground terminal.
2
DAI
Serial data input terminal.
3
DCK
Synchronous clock input terminal for serial data transfer.
Data is sampled at the rising edge of DCK.
4
LAT
Input terminal of data strobe. Data on shift register goes
through at the high level of LAT (level trigger). Otherwise,
data is latched.
5~12
OUT0~7
13
EN
14
DAO
Serial data output terminal.
15
REXT
External resistors connected between REXT and GND for
output current value setting.
16
VCC
Supply voltage terminal.
8-bit Constant Current LED Driver
FUNCTION
Sink constant-current outputs (open-drain).
Output enable terminal:
‘H’ for all outputs are turned off ,
‘L’ for all outputs are active.
Version:A.003
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Page 3
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Equivalent Circuit of Inputs and Outputs
1. DCK, DAI, LAT, EN terminals
2. DAO terminals
8-bit Constant Current LED Driver
Version:A.003
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Page 4
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Maximum Ratings (Ta=25°C, Tj(max) = 120°C)
CHARACTERISTIC
SYMBOL
RATING
UNIT
Supply Voltage
VDD
-0.3 ~ 7.0
V
Input Voltage
VIN
-0.3 ~ VDD+0.3
V
Output Current
IOUT
60
mA
Output Voltage
VOUT
-0.3 ~ 17
V
Input Clock Frequency
FDCK
25
MHz
GND Terminal Current
IGND
1500
mA
1.12 ( PDIP16 : Ta=25°C)
Power Dissipation
(4 layer PCB)
1.17 ( SOP16 : Ta=25°C)
PD
W
1.06 ( SOP16B : Ta=25°C)
0.82 ( SSOP16 : Ta=25°C)
85.0 (PDIP16 )
Thermal Resistance
81.2 (SOP16 )
Rth(j-a)
°C/W
90 (SOP16B )
115.9 (SSOP16 )
Operating Temperature
Top
-40 ~ 85
°C
Storage Temperature
Tstg
-55 ~ 150
°C
Recommended Operating Condition
CHARACTERISTIC
SYMBOL
CONDITION
MIN.
TYP.
MAX.
UNIT
VDD
⎯
3.3
5.0
5.5
V
1.0
⎯
0.5VDD
⎯
⎯
17
Supply Voltage
Output Voltage
Output Voltage
VOUT
VOUT
Output Current
Driver On
*2
Driver Off
IO
OUTn
5
⎯
60
IOH
VOH = VDD – 0.2 V
⎯
⎯
+1.2
IOL
VOL = 0.2 V
⎯
⎯
-1.4
VIH
Input Voltage
*1
VIL
VDD = 3.3 V ~ 5.5V
⎯
VDD
0.0
⎯
0.2VDD
FDCK
⎯
⎯
25
LAT Pulse Width
tw LAT
15
⎯
⎯
DCK Pulse Width
tw DCK
15
⎯
⎯
10
⎯
⎯
10
⎯
⎯
Single Chip Operation
Set-up Time for DAI
tsetup(D)
Hold Time for DAI
thold(D)
Set-up Time for LAT
tsetup(L)
10
⎯
⎯
Hold Time for LAT
thold(L)
10
⎯
⎯
*1
*2
VDD = 5.0V
mA
0.8VDD
Input Clock Frequency
V
V
MHz
ns
Notice that the power dissipation is limited to its package and ambient temperature.
The driver output voltage including any overshoot stress has to be compliant with the maximum voltage (17V).
8-bit Constant Current LED Driver
Version:A.003
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Page 5
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Electrical Characteristics (VDD = 5.0 V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
MIN.
TYP.
MAX.
Input Voltage “H” Level
VIH
CMOS logic level
0.8VDD
⎯
VDD
Input Voltage “L” Level
VIL
CMOS logics2 level
GND
⎯
0.2VDD
Output Leakage Current
IOL
VOH = 17 V
⎯
⎯
±1.0
VOL
IOL = 1.5 mA
⎯
⎯
0.2
VOH
IOH= 1.4 mA
VDD-0.2
⎯
⎯
⎯
⎯
±3
%
±6
%
Output Voltage (DAO)
Output Current Skew
(Channel-to-Channel)
*1
Output Current Skew
(Chip-to-Chip)
*2
Output Voltage Regulation
Supply Voltage Regulation
Supply Current
*3
IOL1
UNIT
V
uA
V
VOUT = 1.0 V
Rrext = 2.2KΩ
IOL2
Rrext = 2.2KΩ
VOUT = 1 V ~ 3 V
⎯
% / VDD
Rrext = 2.2 KΩ
⎯
±1
±4
IDD(off)
power on
all pins are open
unless VDD and GND
2
3
4
IDD(off)
input signal is static
Rrext = 2.9 KΩ
all outputs turn off
4
5
6
IDD(on)
input signal is static
Rrext = 2.9 KΩ
all outputs turn on
4
5
6
IDD(off)
input signal is static
Rrext = 1.05K Ω
all outputs turn off
8
9
10
IDD(on)
input signal is static
Rrext = 1.05K Ω
all outputs turn on
8
9
10
% / VOUT
±0.1
±0.5
%/V
mA
*1
Channel-to-channel skew is defined as the ratio between (any Iout – average Iout) and average Iout, where average
Iout = (Imax + Imin) / 2.
*2
Chip-to-Chip skew is defined as the range into which any output current of any IC falls.
*3
IO excluded.
8-bit Constant Current LED Driver
Version:A.003
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Page 6
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Switching Characteristics (VDD = 5.0V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
MIN.
TYP.
MAX.
46
52
58
48
49
50
EN-to-OUT0
Propagation Delay
tpLH
LAT-to-OUT0
(‘L’ to ‘H’)
Propagation Delay
DCK-to-DAO
VIH = VDD
19
20
21
EN-to-OUT0
VIL = GND
19
22
32
Rrext = 2.2KΩ
72
75
79
VL = 5.0 V
19
19.5
21
31
33.5
36
LAT-to-OUT0
(‘H’ to ‘L’)
tpHL
DCK-to-DAO
Output Current Rise Time
tor
Output Current Fall Time
tof
5
6
7
Output Delay Time (OUT(n)-to-OUT(n+1))
tod
4
5
9
*1
CL
= 13 pF
UNIT
ns
Switching Characteristics (VDD = 3.3V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
MIN.
TYP.
MAX.
46
51
57
EN-to-OUT0
Propagation Delay
LAT-to-OUT0
(‘L’ to ‘H’)
Propagation Delay
tpLH
20
21.5
23
DCK-to-DAO
VIH = VDD
11
12
13
EN-to-OUT0
VIL = GND
22
23
24
Rrext = 2.2KΩ
46
49
53
VL = 5.0 V
11
11.5
12
31
35
39
LAT-to-OUT0
(‘H’ to ‘L’)
*1
CONDITION
tpHL
DCK-to-DAO
Output Current Rise Time
tor
Output Current Fall Time
tof
9
10
11
Output Delay Time (OUT(n)-to-OUT(n+1))
tod
5
10
11
*1
CL
= 13 pF
UNIT
CL means the probe capacitance of oscilloscope.
8-bit Constant Current LED Driver
Version:A.003
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Page 7
ns
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Timing Diagram
1. DCK-DAI, DAO
2. DCK-LAT
3. LAT-OUT0
8-bit Constant Current LED Driver
Version:A.003
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Page 8
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
4. EN-OUT0
5. OUTn+1-OUTn
8-bit Constant Current LED Driver
Version:A.003
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Page 9
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Constant-Current Output
Constant-current value of each output channel is set by an external resistor connected between
the REXT pin and GND. Varying the resistor value can adjust the current scale ranging from 3mA to
60mA. The reference voltage of REXT terminal (Vrext) is approximately 1.25V. The output current
value is calculated roughly by the following equation:
Iout(mA)
5
10
20
30
40
50
M
48.85
48.15
47
46
44.88
43.43
Iout(mA)
Output Current as a Function of Rrext value
60
55
50
45
40
35
30
25
20
15
10
5
0
Iout (mA) ~
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Vrext (V)
× M
Rrext (KΩ)
16
17
18
19
20
21
22
Rext （kΩ）
Iout(mA)
Output Current as a Function of Output Voltage
60
55
50
45
40
35
30
25
20
15
10
5
0
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
Vout(V)
In order to obtain a good performance of constant-current output, a suitable output voltage is
necessary. Users can get related information about the minimum output voltage above.
8-bit Constant Current LED Driver
Version:A.003
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Page 10
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Serial Data Interface
The serial-in data (DAI) will be clocked into 8 bit shift register synchronized on the rising edge
of the clock (DCK). The data ‘1’ represents the corresponding current output ‘ON’, while the data
‘0’ stands for ‘OFF’. The data will be transferred into the 8 bit latch register when the strobe signal
(LAT) is ‘H’ (level trigger); otherwise, the data will be held. The trigger timing of the serial-out data
(DAO) will be shifted out on synchronization to the rising edge of the clock. All outputs are turned
off while enable terminal (EN) is kept at high level. And they are active when EN shifts to low.
8-bit Constant Current LED Driver
Version:A.003
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Page 11
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Outputs Delay
Large in-rush currents will occur when the system activates all the outputs at once. To reduce
this effect, DM11A is designed to have a constant unit of delay (around 2.5ns) between outputs. The
delay sequence for every output goes like this: OUT0 (no delay) Æ OUT7 Æ OUT1 Æ OUT6 Æ
OUT2 Æ OUT5 Æ OUT3 Æ OUT4 (the largest delay).
Global Brightness Control
DM13A has no built-in global brightness control feature. In order to obtain a lower resolution
of global brightness control effect, two methods could be utilized. One is providing PWM signal
synchronized on latch pulse to modulate the output enable terminal (EN pin). The other is to adjust
the Rrext value or voltage drop across the external resistor. Please see the reference circuit below:
8-bit Constant Current LED Driver
Version:A.003
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Page 12
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Power Dissipation
The power dissipation of a semiconductor chip is limited to its package and ambient
temperature, in which the device requires the maximum output current calculated for given
operating conditions. The maximum allowable power consumption can be calculated by the
following equation:
Tj(junction temperature)(max)(°C)– Ta(ambient temperature)(°C)
Pd(max)(Watt) =
Rth(junction-to-air thermal resistance)(°C/Watt)
The relationship between power dissipation and operating temperature can be referred to the figure
below:
2
Power Dissipation Pd(W)
Rth(SOP16)=81.2°C/W
SOP16
Rth(PDIP16)=85.0°C/W
PDIP16
1.5
Rth(SOP16B)=90°C/W
SOP16B
1
Rth(SSOP16)=115.9°C/W
SSOP16
0.5
0
0
20
40
60
80
100
120
140
160
Ambient Temperature Ta(℃)
The power consumption of IC can be determined by the following equation and should be less than
the maximum allowable power dissipation:
Pd(W) = VCC(V)
IDD(A) + Vout0
8-bit Constant Current LED Driver
Iout0
Duty0 +
+ Vout7
Iout7
Version:A.003
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Duty7 < Pd(max)(W)
Page 13
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Typical Application
8-bit Constant Current LED Driver
Version:A.003
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Page 14
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Package Outline Dimension
PDIP16
E1
E
eB
θ°
D
A2
A Seating
L
A1
b
b1
S
e
DIMENSION IN MM
SYMBOL MIN
DIMENSION IN INCH
TYP
MAX
MIN
TYP
MAX
A
-
-
5.334
-
-
0.21
A1
0.381
-
-
0.015
-
-
A2
3.175
3.302
3.429
0.125
0.130
0.135
b
1.300
1.500
1.700 0.05118
0.059 0.06693
b1
0.400
0.480
0.560 0.01575
0.019 0.02205
D
18.669 19.495 20.320
0.735
0.768
0.8
E
7.366
7.620
7.874
0.29
0.300
0.31
E1
6.223
6.812
7.400
0.245
0.268 0.29134
e
2.290
2.540
2.790 0.09016
0.100 0.10984
eB
8.509
9.017
9.525
0.335
0.355
0.375
L
2.540
3.175
3.810
0.1
0.125
0.15
S
-
-
1.120
-
-
0.04409
θ°
0
7
15
0
8-bit Constant Current LED Driver
0.276 0.59055
Version:A.003
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Page 15
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Package Outline Dimension
SSOP16
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN
TYP
MAX
MIN
TYP
MAX
A
1.346
-
1.753
0.053
-
0.069
A1
0.102
-
0.254
0.004
-
0.010
A2
1.245
-
1.499
0.049
-
0.059
b
0.203
-
0.305
0.008
-
0.012
c
0.178
-
0.254
0.007
-
0.010
D
4.801
4.902
5.004
0.189
0.193
0.197
E
5.791
5.994
6.198
0.228
0.236
0.244
e
0.635 BSC
0.635 BSC
E1
3.810
3.912
3.988
0.150
0.154
0.157
L
0.406
-
1.270
0.016
-
0.050
θ°
0
-
8
0
-
8
8-bit Constant Current LED Driver
Version:A.003
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Page 16
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Package Outline Dimension
SOP16B
(300mil)
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN
TYP
MAX
MIN
TYP
MIN
A
2.362
-
2.642
0.093
-
0.104
A1
0.102
-
0.305
0.004
-
0.012
b
0.406 BSC
0.406 BSC
c
0.203 BSC
0.203 BSC
D
10.109
-
10.490
0.398
-
0.413
E
7.391
-
7.595
0.291
-
0.299
e
1.270 BSC
1.270 BSC
H
10.008
-
10.643
0.394
-
0.419
L
0.406
-
1.270
0.016
-
0.050
θ°
0
-
8
0
-
8
8-bit Constant Current LED Driver
Version:A.003
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Page 17
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Package Outline Dimension
SOP16 (exposed pad)
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN
TYP
MAX
MIN
TYP
MAX
A
1.346
-
1.753
0.053
-
0.069
A1
0.051
-
0.152
0.002
-
0.006
b
0.406 BSC
0.406 BSC
c
0.203 BSC
0.203 BSC
D
9.804
-
10.008
0.386
-
0.394
E
3.810
-
3.988
0.150
-
0.157
e
1.270 BSC
1.270 BSC
H
5.791
-
6.198
0.228
-
0.244
L
0.406
-
1.270
0.016
-
0.050
θ°
0
-
8
0
-
8
PAD SIZE1
(95×18E)
E1
1.930
-
2.413
0.076
-
0.095
D1
3.658
-
4.572
0.144
-
0.180
8-bit Constant Current LED Driver
Version:A.003
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Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
Page 18
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
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 Driver
Version:A.003
未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任
Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.
Page 19