8-bit Constant Current LED Driver with Error Detection

DM11C
Version
: A.003
Issue Date : 2009/03/18
File Name : SP-DM11C-A.003.doc
Total Pages : 24
8-bit Constant Current LED Driver
with Error Detection
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
DM11C
DM11C
8-bit Constant Current LED Driver
with Error Detection
General Description
DM11C 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. Its built-in open/short detection circuits help users detect LED failures. System retrieve the
error messages to indicate which channel has failure by serial output data. The thermal shutdown
function provides the over temperature protection.
Features
z
Constant-current outputs: 5mA to 120mA adjustable by one external resistor
z
Maximum output voltage: 17V
z
Maximum clock frequency: 25MHz
z
Built-in real-time LED open/short detection
z
Fast detecting response: 0.1us (min.)
z
Over temperature protection: thermal shutdown (junction temperature > 180°C)
z
Package and pin assignment compatible to conventional LED drivers (ST2221A, DM114/5)
z
Power supply voltage: 3.3V to 5.5V
Applications
z
Indoor/Outdoor LED Video Display
z
LED Variable Message Signs (VMS) System
Package Types
z
PDIP16, SSOP16, SOP16, TSSOP16 (with exposed pad)
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 1
DM11C
Block Diagram
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 2
DM11C
Pin Connection
Pin Description
PIN No.
PIN NAME
1
FUNCTION
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 rising edge of LAT (edge trigger). Otherwise, data is
latched.
5~12
OUT0~7
TSSOP16: exposed pad
Sink constant-current outputs (open-drain).
Output enable terminal:
‘H’ for all outputs are turned off ,
‘L’ for all outputs are active.
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 with Error Detection
Version:A.003
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Page 3
DM11C
Equivalent Circuit of Inputs and Outputs
1. DCK, DAI, LAT, EN terminals
2. DAO terminals
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 4
DM11C
Maximum Ratings (Ta=25°C, Tj(max) = 150°C)
CHARACTERISTIC
Supply Voltage
Input Voltage
SYMBOL
RATING
UNIT
VCC
-0.3 ~ 7.0
V
VIN
-0.3 ~ VCC+0.3
V
Output Current
IOUT
120
mA
Output Voltage
VOUT
-0.3 ~ 17
V
Input Clock Frequency
FDCK
25
MHz
GND Terminal Current
IGND
1
A
3.29 ( TSSOP16 exposed pad: Ta=25°C )
Power Dissipation
(Multi Layer)
PD
1.86 ( PDIP16 : Ta=25°C)
W
2.2 ( SOP16(300mil) : Ta=25°C)
1.5 ( SSOP16 : Ta=25°C)
38 ( TSSOP16 exposed pad)
Thermal Resistance
(Multi Layer)
67 (PDIP16 )
Rth(j-a)
°C/W
56.7 (SOP16(300mil))
82 (SSOP16 )
Operating Temperature
Top
-40 ~ 85
°C
Storage Temperature
Tstg
-55 ~ 150
°C
Recommended Operating Condition
CHARACTERISTIC
Supply Voltage
SYMBOL
CONDITION
MIN.
TYP.
MAX.
UNIT
VCC
⎯
3.3
5.0
5.5
V
1.0
⎯
0.5VCC
⎯
⎯
17
*1
Output Voltage
VOUT
Driver On
Output Voltage
VOUT
Driver Off
IO
OUTn
5
⎯
120
Output Current
IOH
VOH = VCC – 0.2 V
⎯
⎯
+1.5
IOL
VOL = 0.2 V
⎯
⎯
-1.5
0.8VCC
⎯
VCC
0.0
⎯
0.2VCC
⎯
⎯
25
15
⎯
⎯
tw DCK
15
⎯
⎯
tsetup(D)
10
⎯
⎯
VIH
Input Voltage
VIL
Input Clock Frequency
FDCK
LAT Pulse Width
tw LAT
DCK Pulse Width
Set-up Time for DAI
Hold Time for DAI
thold(D)
Set-up Time for LAT
tsetup(L)
Hold Time for LAT
Set-up Time for Open/Short
Open/Short Detection Response
*1
*2
*2
VCC = 3.3 V ~ 5.5V
Single Chip Operation
VCC = 5.0V
10
⎯
⎯
10
⎯
⎯
thold(L)
10
⎯
⎯
tsetup(OS)
25
⎯
⎯
tdet
100
⎯
⎯
V
mA
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 with Error Detection
Version:A.003
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Page 5
DM11C
Electrical Characteristics (VCC = 5.0 V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
MIN.
TYP.
MAX.
Input Voltage “H” Level
VIH
CMOS logic level
0.8VCC
⎯
VCC
Input Voltage “L” Level
VIL
CMOS logic level
GND
⎯
0.2VCC
Output Leakage Current
IOL
VOH = 17 V
⎯
⎯
±1.0
VOL
IOL = 1.5 mA
⎯
⎯
0.2
VOH
IOH= 1.5 mA
VCC-0.2
⎯
⎯
⎯
⎯
±3
%
23.5
25
26.5
mA
Rrext = 2.2 KΩ
VOUT = 1 V ~ 3 V
⎯
±0.1
±0.5
Rrext = 2.2 KΩ
⎯
±1
±4
⎯
0.3
⎯
⎯
0.5VCC
⎯
Output Voltage (S-OUT)
Output Current Skew
(Channel-to-Channel)
IOL1
*1
IOL2
*2
Output Voltage Regulation
% / VOUT
Supply Voltage Regulation
% / VCC
LED Open Detection Threshold
V(od)
V
V
LED Short Detection Threshold
V(sd)
Thermal Shutdown Threshold
T(sht)
junction temperature
⎯
180
⎯
IDD(off)
power on
all pins are open
unless VCC and GND
⎯
1.8
⎯
IDD(off)
input signal is static
Rrext = 2.9 KΩ
all outputs turn off
⎯
2.8
⎯
IDD(on)
input signal is static
Rrext = 2.9 KΩ
all outputs turn on
⎯
3.6
⎯
IDD(off)
input signal is static
Rrext = 560 Ω
all outputs turn off
⎯
7.1
⎯
IDD(on)
input signal is static
Rrext = 560 Ω
all outputs turn on
⎯
8.4
⎯
*3
uA
%/V
all outputs turn on
Supply Current
V
VOUT = 1.0 V
Rrext = 2.2 KΩ
Output Current Skew
(Chip-to-Chip)
UNIT
°C
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 with Error Detection
Version:A.003
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Page 6
DM11C
Switching Characteristics (VCC = 5.0V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
EN-to-OUT7
Propagation Delay
tpLH
LAT-to-OUT7
(‘L to ‘H’)
DCK-to-DAO
VIL = GND
EN-to-OUT7
Propagation Delay
LAT-to-OUT7
(‘H’ to ‘L’)
VIH = VCC
tpHL
Rrext = 2.2 KΩ
VL = 5.0 V
DCK-to-DAO
Output Current Rise Time
tor
Output Current Fall Time
tof
Output Delay Time (OUT(n)-to-OUT(n+1))
tod
RL = 180 Ω
*1
CL
= 13 pF
MIN.
TYP.
MAX.
⎯
16
⎯
⎯
28
⎯
⎯
17
⎯
⎯
18
⎯
⎯
21.5
⎯
⎯
16
⎯
⎯
17
⎯
⎯
15
⎯
⎯
2.2
⎯
UNIT
ns
Switching Characteristics (VCC = 3.3V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
EN-to-OUT7
Propagation Delay
LAT-to-OUT7
(‘L to ‘H’)
tpLH
DCK-to-DAO
LAT-to-OUT7
(‘H’ to ‘L’)
tpHL
Rrext = 2.2 KΩ
VL = 5.0 V
DCK-to-DAO
Output Current Rise Time
VIH = VCC
VIL = GND
EN-to-OUT7
Propagation Delay
*1
CONDITION
tor
Output Current Fall Time
tof
Output Delay Time (OUT(n)-to-OUT(n+1))
tod
RL = 180 Ω
*1
CL
= 13 pF
MIN.
TYP.
MAX.
⎯
62
⎯
⎯
54
⎯
⎯
23
⎯
⎯
23
⎯
⎯
25
⎯
⎯
18.5
⎯
⎯
50
⎯
⎯
15
⎯
⎯
2.2
⎯
UNIT
ns
CL means the probe capacitance of oscilloscope.
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 7
DM11C
Timing Diagram
1. DCK-DAI, DAO
2. DCK-LAT
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 8
DM11C
3. LAT-OUT7
4. EN-OUT7
twEN
50%
50%
EN
tor
tof
90%
90%
50%
OUT7
50%
10%
tpLH
(current)
10%
tpHL
5. OUTn+1-OUTn
6. OS-LAT, DCK (EN=’L’)
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 9
DM11C
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 5mA to
120mA. The reference voltage of REXT terminal (Vrext) is approximately 0.6V. The output current
value is calculated roughly by the following equation:
Iout(mA)
5
10
20
30
40
50
60
70
80
90
100
110
120
M
99.7
98.1
96.0
94.2
92.5
90.8
89.1
87.1
85.1
84.4
80.5
78
70.6
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 10
DM11C
Iout (mA)
Output Current as a Function of Rrext value
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Iout (mA) ~
0
1
2
3
4
5
6
7
Vrext (V)
× M
Rrext (KΩ)
8
9
10
11
12
2.8
3
Rrext (KΩ)
Iout (mA)
Output Current as a Function of Output Voltage
130
120
110
100
90
80
70
60
50
40
30
20
10
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
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.
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 synchronized on the rising edge
(edge trigger) of the strobe signal (LAT); otherwise, the data will be held. The latch pulse should be
sent after the falling edge of the last clock within a frame data. 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
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 11
DM11C
turned off while enable terminal (EN) is kept at high level. And they are active when EN shifts to
low.
Thermal Shutdown
During operation, when the junction temperature of the IC will reach approximately above
180℃, it will cause the driver to shutdown all the outputs. Basically, the IC will cool down and
return to the safe operating temperature which is approximately below 110℃. DM11C will restart
all the outputs at the same time. Operation in the thermal situation for a long time may cause chip
damage permanently.
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 12
DM11C
LED Open/Short Detection
The result of open/short detection of DM11C could be retrieved from serial-out (DAO) data. It
will be identified as a LED open failure when the output is turned on but the output voltage is below
0.3V. And then it will be identified as a LED short failure when the output is turned on but the
output voltage is above 1/2 VCC.
To set up with the following conditions: (1) the image data written in shift register
corresponding to particular output channel is ‘1’; (2) the output enable terminal is activated
(EN=‘L’); (3) the rising edge of the latch signal (LAT), DM11C will execute LED open/short
detection then renews the results within the corresponding shift register.
By using the error message retrieved from serial-out data, system can recognize the status of
every LED driven by each channel. For either LED open or short detection, the original image data
is written to ‘1’ but ‘0’ is retrieved then a LED failure has occurred. If the image data is written to
‘0’ or the output enable terminal is inactive (EN=‘H’), it will not execute any detection process for
the corresponding channel. Therefore, system still retrieves the original image data.
Real-time monitor
With the above operating principle, system could continuously retrieve LED status from
serial-out then compare with the last frame data one by one. Once there is any discrepancy
(‘1’Æ‘0’), we can locate which channel is abnormal precisely. Since the process is ongoing and
without shifting between image mode and detection mode, it does not interrupt the image data flow
and the output display. The ‘real-time monitor’ method is suitable for LED Variable Message Signs
(VMS) system.
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 13
DM11C
Clocks calculation
For large LED display applications, ‘real-time monitor’ could be a heavy loading for system
because it needs to compare the retrieved information with a lot of frame data. Therefore, to write
the image data of all channels to ‘1’, all failure status will be identified when there will be any ‘0’
retrieved. By calculating the numbers of clock pulses, the locations of abnormal channel could be
pointed out easily. The “clocks calculation” method helps to minimize the loading and memory
resources of system.
Selection of Open/Short Detection
The default detection type provided by DM11C is LED open detection after power-on. Users
could switch LED open to short detection (or short to open detection) by following timing sequence.
There are two alternative options could be selected. The option 1 shows triggering latch pulse when
the last clock of the frame data kept at high level. The option 2 shows sending one useless clock
pulse which will not shift-in data while the latch signal is kept at high level.
useless clock pulse does not shift-in data
Open
Short
or
Short
Open
Timing Diagram of LED Open/Short Detection
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 14
DM11C
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 15
DM11C
Threshold of Short Detection
The default threshold voltage for LED short detection of DM11C is 1/2 VCC. One could
change the default voltage by switching or setting a new voltage of VLED during short detection is
going on. Please see the example below for reference:
Note that the VSHORT should be satisfied with the following inequality:
The new threshold voltage of short detection will be equivalent to:
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 16
DM11C
Outputs Delay
Large in-rush currents will occur when the system activates all the outputs at once. To reduce
this effect, DM11C is designed to have a constant unit of delay (around 1.5ns) between every output.
The delay for every output goes like this: there is no delay for OUT7, 1 unit of delay for OUT6, 2
units of delay for OUT5 and so on.
Global Brightness Control
DM11C 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 with Error Detection
Version:A.003
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Page 17
DM11C
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:
3.5
TSSOP16
Tj(max)=150°C
Power Dissipation Pd(W)
3
Rth(TSSOP16EX)=38°C/W
2.5
SOP16(300mil)
Rth(PDIP16)=67°C/W
PDIP16
2
Rth(SOP16(300mil))=56.7°C/W
Rth(SSOP16)=82°C/W
SSOP16
1.5
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:
8-bit Constant Current LED Driver with Error Detection
Version:A.003
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Page 18
DM11C
Typical Application
8-bit Constant Current LED Driver with Error Detection
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Page 19
DM11C
Package Outline Dimension
DM11C-DIP16
DIMENSION IN MM
DIMENSION IN INCH
SYMBOL
MIN
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
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
0.09016 0.100 0.10984
8-bit Constant Current LED Driver with Error Detection
0.276 0.59055
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Page 20
DM11C
Package Outline Dimension
DM11C-SSOP16
DIMENSIONS IN INCH
SYMBOLS
MIN.
A
MAX.
MIN.
TYP.
MAX.
0.053
0.069
1.346
-
1.753
A1
0.004
0.010
0.102
-
0.254
A2
0.049
0.059
1.245
-
1.499
b
0.007
0.012
0.190
-
0.305
c
0.007
0.014
0.178
-
0.350
D
0.189
0.193
0.197
4.801
4.902
5.004
E
0.228
-
0.244
5.791
-
6.200
e
TYP.
DIMENSIONS IN MM
0.025 BSC
0.635 BSC
E1
0.150
-
0.157
3.800
-
4.000
L
0.016
-
0.050
0.400
-
1.270
θ°
0.000
-
8.000
0
-
8
8-bit Constant Current LED Driver with Error Detection
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 21
DM11C
Package Outline Dimension
SOP16 (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 with Error Detection
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 22
DM11C
Package Outline Dimension
TSSOP16 (exposed pad)
DIMENSION MM
DIMENSION INCH
SYMBOL
MIN
TYP
MAX
MIN
TYP
MAX
A
-
-
1.200
-
-
0.047
A1
0.000
-
0.150
0.000
-
0.006
A2
0.800 1.000 1.050
0.031
0.039
0.041
b
0.190
0.300
0.190
-
0.300
D
4.900 5.000 5.100
0.193
0.197
0.201
E1
4.300 4.400 4.500
0.043
0.173
0.177
E
6.400 BSC
6.400 BSC
e
0.650 BSC
0.650 BSC
L1
1.000 REF
1.000 REF
L
0.450 0.600 0.750
0.018
0.024
0.030
S
0.200
-
-
0.002
-
-
θ°
0
-
8
0
-
8
PAD SIZE
-
(118×11E)
E2
2.400
-
3.000
0.094
-
0.118
D1
2.400
-
3.000
0.094
-
0.118
8-bit Constant Current LED Driver with Error Detection
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 23
DM11C
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 with Error Detection
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 24