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DM13A
Version : A.003 Issue Date : 2007/12/12 File Name : SP-DM13A-A.003.doc Total Pages : 20
16-bit Constant Current LED Driver
9 7 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park, Hsin-Chu, Taiwan 300, R.O.C. Tel886-3-5645656 Fax886-3-5645626

SILICON TOUCH TECHNOLOGY INC.
DM13A
DM13A
16-bit Constant Current LED Driver
General Description DM13A 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 16 channels is adjustable by a single external resistor.
Features Constant-current outputs: 3mA to 60mA adjustable by one external resistor Maximum output voltage: 17V Maximum clock frequency: 25MHz Power supply voltage: 3.3V to 5V In-rush current control Bit-to-bit skew : 3 % Chip-to-chip skew : 6 %
Package and pin assignment compatible to conventional LED drivers (ST2221C, DM134/5/6)
Applications Indoor/Outdoor LED Video Display LED Variable Message Signs (VMS) System
Package Types PDIP24, SOP24, SOP24B, SSOP24
16-bit Constant Current LED Driver
Version:A.003
Page 1
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Block Diagram
16-bit Constant Current LED Driver
Version:A.003
Page 2
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Pin Connection
GND DAI DCK LAT OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7
1 2 3 4 5 6 7 8 9 10 11 12 (top view) 24 23
VDD REXT DAO EN OUT15 OUT14 OUT13 OUT12 OUT11 OUT10 OUT9 OUT8
DIP24 SOP24 SSOP24 TSSOP24
22 21 20 19 18 17 16 15 14 13
Pin Description
PIN No. DIP24/SOP24/SSOP24: 1 PIN NAME GND Ground terminal. FUNCTION
DIP24/SOP24/SSOP24: 2
DAI
Serial data input terminal.
DIP24/SOP24/SSOP24: 3
DCK
Synchronous clock input terminal for serial data transfer. Data is sampled at the rising edge of DCK. Input terminal of data strobe. Data on shift register goes through at the high level of LAT (level trigger). Otherwise, data is latched.
DIP24/SOP24/SSOP24: 4
LAT
DIP24/SOP24/SSOP24: 5~20
OUT0~15 Sink constant-current outputs (open-drain). Output enable terminal: `H' for all outputs are turned off , `L' for all outputs are active. Serial data output terminal.
DIP24/SOP24/SSOP24: 21
EN
DIP24/SOP24/SSOP24: 22
DAO
DIP24/SOP24/SSOP24: 23 DIP24/SOP24/SSOP24: 24
REXT
External resistors connected between REXT and GND for output current value setting.
VDD
Supply voltage terminal.
16-bit Constant Current LED Driver
Version:A.003
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Equivalent Circuit of Inputs and Outputs
1. DCK, DAI, LAT, EN terminals
2. DAO terminals
16-bit Constant Current LED Driver
Version:A.003
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Maximum Ratings*1(Ta=25C, Tj(max) = 150C)
CHARACTERISTIC Supply Voltage Input Voltage Output Current Output Voltage Input Clock Frequency GND Terminal Current Power Dissipation (4 layer PCB) SYMBOL VDD VIN IOUT VOUT FDCK IGND RATING -0.3 ~ 7.0 -0.3 ~ VDD+0.3 70 -0.3 ~ 17 25 1500 1.90 ( PDIP24 : Ta=25C) PD 1.20 ( SOP24 : Ta=25C) TBD( SOP24B : Ta=25C) 1.05 ( SSOP24 : Ta=25C) 50.0 (PDIP24 ) Thermal Resistance Rth(j-a) TBD ( SOP24B) 79.2 (SOP24 ) 90.2 (SSOP24 ) Operating Temperature Storage Temperature Top Tstg -40 ~ 85 -55 ~ 150 C C C/W W UNIT V V mA V MHz mA
Recommended Operating Condition
CHARACTERISTIC Supply Voltage Output Voltage Output Voltage Output Current SYMBOL VDD VOUT VOUT IO IOH IOL Input Voltage Input Clock Frequency LAT Pulse Width DCK Pulse Width Set-up Time for DAI Hold Time for DAI Set-up Time for LAT Hold Time for LAT VIH VIL FDCK tw LAT tw DCK tsetup(D) thold(D) tsetup(L) thold(L) VDD = 5.0V CONDITION Driver On Driver Off OUTn VOH = VDD - 0.2 V VOL = 0.2 V VDD = 3.3 V ~ 5.5V Single Chip Operation
*2
MIN. 3.3 1.0 5 0.8VDD 0.0 15 15 10 10 10 10
TYP. 5.0
MAX. 5.5 0.5VDD 17 60 +1.2 -1.4 VDD 0.2VDD 25
UNIT V V
*3
mA
V MHz
ns
Stress beyond those listed under "Maximum Ratings" may cause permanent damage to the device. These are stress ratings only; it's not implied functional operation condition. Exposure to "Maximum Ratings" conditions for extended periods may affect device reliability and life time. *2 Notice that the power dissipation is limited to its package and ambient temperature. *3 The driver output voltage including any overshoot stress has to be compliant with the maximum voltage (17V). 16-bit Constant Current LED Driver Version:A.003 Page 5
*1
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Electrical Characteristics (VDD = 5.0 V, Ta = 25C unless otherwise noted)
CHARACTERISTIC Input Voltage "H" Level Input Voltage "L" Level Output Leakage Current Output Voltage (DAO) VOH Output Current Skew (Channel-to-Channel) Output Current Skew (Chip-to-Chip)
*2 *1
SYMBOL VIH VIL IOL VOL
CONDITION CMOS logic level CMOS logics2 level VOH = 17 V IOL = 1.5 mA IOH= 1.4 mA
MIN. 0.8VDD GND VDD-0.2
TYP.
MAX. VDD 0.2VDD 1.0 0.2 3
UNIT V uA V
IOL1 VOUT = 1.0 V Rrext = 2.2K IOL2 Rrext = 2.2K VOUT = 1 V ~ 3 V Rrext = 2.2 K power on all pins are open unless VDD and GND input signal is static Rrext = 2.9 K all outputs turn off input signal is static Rrext = 2.9 K all outputs turn on input signal is static Rrext = 1.05K all outputs turn off input signal is static Rrext = 1.05K all outputs turn on
%
6
%
Output Voltage Regulation Supply Voltage Regulation
% / VOUT % / VDD IDD(off)

0.1 1 3
0.5 %/V 4 4
IDD(off)
5
6
Supply Current
*3
IDD(on)
5
6
mA
IDD(off)
9
10
IDD(on)
9
10
*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. 16-bit Constant Current LED Driver Version:A.003 Page 6
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Switching Characteristics (VDD = 5.0V, Ta = 25C unless otherwise noted)
CHARACTERISTIC Propagation Delay (`L' to `H') EN-to-OUT0 LAT-to-OUT0 DCK-to-DAO EN-to-OUT0 LAT-to-OUT0 (`H' to `L') Output Current Rise Time Output Current Fall Time Output Delay Time (OUT(n)-to-OUT(n+1)) DCK-to-DAO tor tof tod tpHL tpLH VIH = VDD VIL = GND Rrext = 2.2K VL = 5.0 V CL
*1
SYMBOL
CONDITION
MIN.
TYP. 52 49 20 22 75 19.5 33.5 6 5
MAX.
UNIT
Propagation Delay
ns
= 13 pF
Switching Characteristics (VDD = 3.3V, Ta = 25C unless otherwise noted)
CHARACTERISTIC Propagation Delay (`L' to `H') EN-to-OUT0 LAT-to-OUT0 DCK-to-DAO EN-to-OUT0 LAT-to-OUT0 (`H' to `L') Output Current Rise Time Output Current Fall Time Output Delay Time (OUT(n)-to-OUT(n+1)) DCK-to-DAO tor tof tod tpHL tpLH VIH = VDD VIL = GND Rrext = 2.2K VL = 5.0 V CL
*1
SYMBOL
CONDITION
MIN.
TYP. 51 21.5 12 23 49 11.5 35 10 10
MAX.
UNIT
Propagation Delay
ns
= 13 pF
*1
CL means the probe capacitance of oscilloscope. Version:A.003 Page 7
16-bit Constant Current LED Driver
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Timing Diagram
1. DCK-DAI, DAO
2. DCK-LAT
3. LAT-OUT0
16-bit Constant Current LED Driver
Version:A.003
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SILICON TOUCH TECHNOLOGY INC.
DM13A
4. EN-OUT0
5. OUTn+1-OUTn
16-bit Constant Current LED Driver
Version:A.003
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SILICON TOUCH TECHNOLOGY INC.
DM13A
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 1.2V. The output current value is calculated roughly by the following equation:
Iout(mA) M 3 55 5 54.1 10 50 20 46.6 30 45 40 43.3 50 41.6
Output Current as a Function of Rrext value
60 55 50 45 40 35 30 25 20 15 10 5 0 0 1 2 3 4 5 6 7 8 9 10 11
Iout(mA)
Iout (mA) ~
Vrext (V) xM Rrext (K)
12
13
14
15
16
17
18
19
20
21
22
Rext k
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
Iout(mA)
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.
16-bit Constant Current LED Driver Version:A.003 Page 10
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Serial Data Interface
The serial-in data (DAI) will be clocked into 16 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 16 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.
16-bit Constant Current LED Driver
Version:A.003
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Outputs Delay
Large in-rush currents will occur when the system activates all the outputs at once. To reduce this effect, DM13A is designed to have a constant unit of delay (around 5ns) between outputs. The delay sequence for every output goes like this: OUT0 (no delay) OUT15 OUT1 OUT14 OUT2 OUT13 OUT3 OUT12 OUT4 OUT11 OUT5 OUT10 OUT6 OUT9 OUT7 OUT8 (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:
16-bit Constant Current LED Driver
Version:A.003
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SILICON TOUCH TECHNOLOGY INC.
DM13A
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:
Pd(max)(Watt) =
Tj(junction temperature)(max)(C)- Ta(ambient temperature)(C) Rth(junction-to-air thermal resistance)(C/Watt)
The relationship between power dissipation and operating temperature can be refer to the figure below:
3
Tj(max)=150C
2.5
PDIP24
Rth(PDIP24)=50.0C/Watt Rth(SOP24)=79.2C/Watt
Power Dissipation Pd(W)
2
SOP24
Rth(SSOP24)=90.2C/Watt
1.5
SSOP24
1
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:
16-bit Constant Current LED Driver
Version:A.003
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Typical Application
16-bit Constant Current LED Driver
Version:A.003
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Package Outline Dimension
PDIP24
D 24 13
E1
1
12
A2
A
SEATING PLANE
b1 b
e
DIMENSIONS IN INCH SYMBOLS A A1 A2 b b1 D E E1 E2 e L MIN. 0.015 0.125 0.060TYP. 0.018TYP. 1.230 0.253 0.335 0.115 0 1.280 0.263 0.3750.150 15 0.300TYP. MAX. 0.210 0.135
DIMENSIONS IN MM MIN. 0.381 3.175 1.524TYP. 0.457TYP. 31.242 6.426 8.509 2.921 0 32.521 6.680 9.525 3.810 15 7.620TYP. MAX. 5.334 3.429
0.100TYP.
2.540TYP.
16-bit Constant Current LED Driver
Version:A.003
A1
L
E2
E
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Package Outline Dimension
SSOP24
D 24 13
1
12
E1
A
E
C
A2
L L1 DETAIL A
GAUGE PLANE
b
e
0.004
DIMENSIONS IN INCH SYMBOLS A A1 A2 b C D E E1 e L L1 MIN. 0.053 0.004 0.008 0.007 0.337 0.228 0.150 0.016 0 MAX. 0.069 0.010 0.059 0.012 0.010 0.344 0.244 0.157 0.050 8
DIMENSIONS IN MM MIN. 1.346 0.102 0.203 0.178 8.560 5.791 3.810 0.406 0 MAX. 1.753 0.254 1.499 0.305 0.254 8.738 6.198 3.988 1.270 8
0.025TYP. 0.041TYP.
0.635TYP. 1.041TYP.
16-bit Constant Current LED Driver
Version:A.003
A1
SEATING PLANE
A
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Package Outline Dimension
SOP24
b e
D
0.01 inch
GAUGE PLANE SEATING PLANE L
0.004MAX.
DIMENSIONS IN INCH SYMBOLS A A1 b D E e H L MIN. 0.093 0.004 0.599 0.291 0.394 0.016 0 MAX. 0.104 0.012 0.614 0.299 0.419 0.050 8
A1
A
H
E
DIMENSIONS IN MM MIN. 2.362 0.102 15.215 7.391 10.008 0.406 0 MAX. 2.642 0.305 15.596 7.595 10.643 1.270 8
0.016TYP.
0.406TYP.
0.050TYP.
1.270TYP.
16-bit Constant Current LED Driver
Version:A.003
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SILICON TOUCH TECHNOLOGY INC.
DM13A
Package Outline Dimension
SOP24B
A
X
B B2
B1
A1
A2
A3
D1
C3
R2
3
D
R1
4 2 1
C1
C4
C2
DETAIL X
DIMENSIONS IN INCH SYMBOLS A A1 A2 A3 B B1 B2 C C1 C2 C3 C4 D D1 R1 R2 1 2 3 4 0.067 0.006 0.002 0.299 0.232 MIN. 0.508 0.012 0.031 0.323 0.240 0.087 0.075 0.012 0.008 MAX. 0.516 0.020
DIMENSIONS IN MM MIN. 12.9 0.30 MAX. 13.1 0.50
0.039TYP.
1.00TYP. 0.80TYP. 7.60 5.90 1.70 0.15 0.05 8.20 6.10 2.20 1.90 0.30 0.20
0.300TYP.
7.62TYP.
0.031TYP. 0.037TYP. 0.013 0.029 0.008TYP. 0.008TYP. 8TYP 10TYP 4TYP 5TYP
0.80TYP. 0.95TYP. 0.33 0.73 0.20TYP. 0.20TYP. 8TYP 10TYP 4TYP 5TYP
16-bit Constant Current LED Driver
Version:A.003
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SILICON TOUCH TECHNOLOGY INC.
DM13A
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.
16-bit Constant Current LED Driver
Version:A.003
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