DM11H - Silicon Touch Technology Inc.

DM11H
Version
Issue Date
File Name
Total Pages
: PRE.002
: 2009/10/13
: SP-DM11H-PRE.002.doc
: 23
8-Channel 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
DM11H
DM11H
8-Channel Constant Current LED Driver
With Error Detection
General Description
DM11H is a 8-channel 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 of each channel is set by a
single external resistor. Overall output currents can be adjusted by a 7-bit serial shift-in data.
Its built-in LED open/short detection, output channels short to GND detection help users to
detect LED failures, outputs short. The thermal alarm and shutdown functions provide the
over-temperature protection.
Features
z
8-Channel Constant-current outputs: 5mA to 90mA adjustable by one external resistor
z
Maximum output voltage: 17V
z
Maximum cascade clock frequency: 25MHz
z
7-bit linear global brightness control
z
Built-in LED open/short detection: Real-time detection or Smart detection
z
Built-in Outputs short to GND detection: Real-time or Smart detection
z
Fast detecting response: 100ns (min.)
z
Over temperature protection:
Alarm (junction temperature > 130°C)
Shutdown (junction temperature > 170°C)
z
Sleep mode (sleep current : <5uA)
z
In-rush current control
z
Schmitt trigger input
z
Power supply voltage: 3.0V to 5.5V
z
Package pin assignment compatible to conventional LED drivers (DM114B/115B,DM11C)
Applications
z
LED Variable Message Signs (VMS) System
z
Indoor/Outdoor LED Video Display
Packages
SOP16, SSOP16
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 1
DM11H
Block Diagram
OUT0
OUT7
VCC
GND
LED Open / Short Detector
&
Output short to GND Detector
Smartl
Detction
,
controller
Temperature Control
REXT
Voltage Reference
8 -channel Constant Current Driver
With 7 -bit global brightness control
EN
8
3
LAT
8
7
10 - bit Latch
Register
10
DCK
8
8 bit Latch
Register
8
10 / 8 bit Shift Register
DAI
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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DAO
Page 2
DM11H
Pin Connection
SOP16/SSOP16
GND
DAI
CLK
LAT
OUT0
OUT1
OUT2
OUT3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
(TOP view)
10
9
VCC
REXT
DAO
EN
OUT7
OUT6
OUT5
OUT4
Pin Description
PIN No.
PIN NAME
FUNCTION
1
GND
Ground terminal.
2
DAI
Serial data input terminal.
3
CLK
Synchronous clock input terminal for serial data transfer.
Data is sampled at the rising edge of CLK.
4
LAT
Input terminal of data strobe.
Data on shift register goes through at the rising edge (edge trigger).
Otherwise, data is latched.
5~12
OUT0~7
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:PRE.002
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Page 3
DM11H
Equivalent Circuit of Inputs and Outputs
1.CLK, DAI, LAT , EN terminals ( Schmitt Trigger Input )
2. DAO terminals
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 4
DM11H
Maximum Ratings (Ta=25°C, Tj(max) = 120°C)
SYMBOL
RATING
UNIT
Supply Voltage
CHARACTERISTIC
VCC
-0.3 ~ 7.0
V
Input Voltage
VIN
-0.3 ~ VCC+0.3
V
Output Current
IOUT
90
mA
Output Voltage
VOUT
-0.3 ~ 17
V
Input Clock Frequency
FCKI
30
MHz
GND Terminal Current
IGND
1500
mA
Power Dissipation
Thermal Resistance
1.17 ( SOP16)
PD
W
0.82 (SSOP16)
81.2 (SOP16)
Rth(j-a)
°C/W
115.9 (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
⎯
3.0
⎯
5.5
V
⎯
⎯
17
V
*1
Output Voltage
VOUT
IO
OUTn, VCC=5V
5
⎯
90
Output Current
IOH
VOH = VCC – 0.2 V
⎯
⎯
+4
IOL
VOL = 0.2 V
⎯
⎯
-4
Input Voltage
Input Clock Frequency
VIH
VIL
FCKI
Driver Off
VCC = 3.3 V ~ 5V
Single Chip Operation
Cascade Operation
0.7VCC
⎯
VCC
0.0
⎯
0.3VCC
⎯
⎯
⎯
15
30
⎯
tw LAT
CLK Pulse Width
tw CLK
⎯
13
⎯
EN Pulse Width
tw EN
50
⎯
⎯
⎯
10
⎯
⎯
10
⎯
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
⎯
tdet
⎯
100
⎯
Detection Response
*1
V
MHz
⎯
LAT Pulse Width
VCC = 5.0V
mA
ns
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:PRE.002
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Page 5
Electrical Characteristics (VCC = 5.0 V, Ta = 25°C
DM11H
unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
MIN.
TYP.
MAX.
Input Voltage “H” Level
VIH
CMOS logic level
0.7VCC
⎯
VCC
Input Voltage “L” Level
VIL
CMOS logic level
GND
⎯
0.3VCC
Output Leakage Current
IOL
VOH = 17 V
⎯
⎯
±1
VOL
IOL = -4 mA
⎯
⎯
0.2
VOH
IOH= 4 mA
VCC-0.2
⎯
⎯
⎯
⎯
±3
%
⎯
⎯
±6
%
Output Voltage (S-OUT)
Output Current Skew
(Channel-to-Channel)
IOL1
*1
V
uA
V
VOUT = 1.0 V
Rrext = 3.9 KΩ
Output Current Skew
(Chip-to-Chip)
UNIT
IOL2
*2
Output Voltage Regulation
% / VOUT
Rrext = 3.9 KΩ
VOUT = 1 V ~ 3 V
⎯
±0.1
±0.5
Supply Voltage Regulation
% / VCC
Rrext = 3.9 KΩ
⎯
±1
±4
Differential Linearity
DLE
Rrext = 3.9 KΩ
⎯
±1.5
⎯
LSB
Output Voltage Short to GND,
LED Open Detection Threshold
V(od)
all outputs turn on
⎯
0.1
⎯
V
SV = ”H”
⎯
VCC
⎯
V
SV = ”L”
⎯
5/6VCC
⎯
V
⎯
130
⎯
⎯
170
⎯
LED Short Detection Threshold*3
(output turns on)
V(sd)
T(130)
Thermal Threshold
T(170)
Thermal Shutdown Threshold
⎯
170
⎯
IDD(off)
power on
all pins are open
unless VCC and GND
⎯
1.2
⎯
IDD(off)
Rrext = 3.9 KΩ
all outputs turn off
⎯
7
⎯
IDD(on)
Rrext = 3.9 KΩ
all outputs turn on
⎯
7.6
⎯
IDD(off)
Rrext = 820 Ω
all outputs turn off
⎯
27.5
⎯
IDD(on)
Rrext = 820 Ω
all outputs turn on
⎯
25.3
⎯
IDD(sleep)
Sleep current
⎯
5
50
T(sht)
Supply Current
(Input signal is static)
junction temperature
%/V
°C
mA
uA
*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
LED short detection voltage level default value is VCC, refer to Page 12 for level selection.
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 6
DM11H
Switching Characteristics (VCC = 5.0V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
EN -to-OUT0
Propagation Delay
Propagation Delay
MAX.
⎯
26
⎯
⎯
31
⎯
CLK-to-DAO
⎯
19
⎯
EN -to-OUT0
Rrext = 3.9 KΩ
⎯
31
⎯
VL = 5.0 V
⎯
32
⎯
RL = 0.18 KΩ
⎯
20
⎯
CL = 13 pF
⎯
10
⎯
LAT -to-OUT0
(‘H’ to ‘L’)
TYP.
VIL = GND
LAT -to-OUT0
(‘L to ‘H’)
VIH = VCC
MIN.
tpLH
tpHL
CLK-to-DAO
Output Current Rise Time
tor
Output Current Fall Time
tof
⎯
10
⎯
Output Delay Time (OUT(n)-to-OUT(n+1))
tod
⎯
3
⎯
UNIT
ns
Switching Characteristics (VCC = 3.3V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
EN -to-OUT0
Propagation Delay
LAT -to-OUT0
(‘L to ‘H’)
Propagation Delay
TYP.
MAX.
⎯
36
⎯
⎯
37
⎯
CLK-to-DAO
VIL = GND
⎯
22
⎯
EN -to-OUT0
Rrext = 3.9 KΩ
⎯
35
⎯
VL = 5 V
⎯
37
⎯
RL = 0.18 KΩ
⎯
23
⎯
CL = 13 pF
⎯
14
⎯
LAT -to-OUT0
(‘H’ to ‘L’)
tpLH
VIH = VCC
MIN.
tpHL
CLK-to-DAO
Output Current Rise Time
tor
Output Current Fall Time
tof
⎯
14
⎯
Output Delay Time (OUT(n)-to-OUT(n+1))
tod
⎯
3
⎯
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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UNIT
ns
Page 7
DM11H
Timing Diagram
1. CLK-DAI, DAO
twDCK
DCK
50%
t setup(D)
DAI
twDCK
50%
50%
50%
thold(D)
50%
50%
DAO
50%
50%
tpLH
tpHL
2. CLK- LAT
CLK
50%
50%
t hold(L)
t setup(L)
LAT
50%
50%
twLAT
3. LAT -OUT0
50%
50%
LAT
t or
tof
90%
90%
50%
OUT0
50%
10%
10%
t pLH
(current)
t pHL
4. EN -OUT0
t wEN
EN
50%
50%
tof
tor
90%
90%
50%
50%
10%
OUT0
t pLH
(current)
10%
t pHL
5. OUTn+1-OUTn
OUTn+1
(current)
50%
tod
OUTn
(current)
50%
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 8
DM11H
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 90mA. The reference voltage of REXT terminal (Vrext) is
approximately 1.23V. The output current value is calculated by the following equation:
90
80
Iout (mA) ~
IOUT(mA)
70
60
V rext (V)
× 65
Rrext (KΩ)
50
40
30
20
10
0
1
2
3
4
5
6
Rext (K)
7
8
9
10
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 below.
100
90
80
IOUT(mA)
70
60
50
40
30
20
10
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
VOUT(V)
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 9
DM11H
Serial Data Interface
DM11H includes a flexible data transfer interface. The data can be transferred from DAI
pin to the shift registers at the rising edge of CLK. After all data are clocked in, a rising edge
of the LAT signal can transfer the serial data to the data latches (Edge trigger). The serial
data format can be 8-bit or 10-bit wide, depending on the operating mode of the device.
Operation Mode
DM11H has two operating modes depending on the combination of CLK and LAT
signals. The table below shows the available operating modes. For normal operation (SD
mode), the data width of shift register is 8-bit, which is used to set 8 bits serial-in image data.
The sequence of the combination of CLK and LAT explains in following pages is used to
change the operation mode. If there are four triggering clock pulses (CLK) with high level
latch ( LAT ), DM11H will change to command data input mode (CD mode) at falling edge of
the latch pulse ( LAT ) then user can make ten triggering clock pulses to set 7-bit GBC data
(default value after power-on is 7’b1000000), 2-bit voltage level selection of short detection
(default value after power-on is 1’b10) and 1-bit sleep control data (default value is 1’b0)
OPERATION MODE
SHIFT REGISTER
Serial-in Data Input Mode (SD mode)
8-bit
Command Data Input Mode (CD mode)
10-bit
8-bit Constant Current LED Driver with Error Detection
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Page 10
DM11H
SD Mode Data Format
MSB
7
OUT 7
6
5
OUT 6
OUT 5
4
3
2
1
OUT4
OUT3
OUT2
OUT1
LSB
0
OUT0
Shift - in first
When DM11H operates at SD mode, the serial-in data (DAI) will be clocked into 8-bit
shift register synchronized on the rising edge of the clock (CLK). 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 of the strobe signal ( LAT );
otherwise, the output data won’t be changed. The latch pulse should be sent after the falling
edge of the last clock within a frame data.
0
1
2
3
4
5
6
7
0
1
CLK
1
0
high
DAI
DAO
2
low
1
previous data
0
Tsetup (L)
LAT
high
low
1
EN
0
on
OUT 0
off
(current)
on
OUT 1
off
(current)
on
OUT 2
off
(current)
on
OUT 3
off
(current)
on
OUT 4
off
(current)
on
OUT 5
off
(current)
on
OUT 6
off
(current)
on
OUT 7
off
(current)
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 11
DM11H
CD Mode Data Format
a. Global Brightness Control
DM11H offers a convenient way to fine tune the whole chip output currents for the
uniformity of brightness between modules, ICs or the accomodation to ambient light. To
further adjust the current level linearly, the system shall enter the CD MODE and then shift
in 7-bit GBC data code through DAI pin. The MSB should be shifted-in first. Take the input
code. G[6:0]= (MSB)1001011(LSB) for example. The new current is then equal to the base
current multiplied by the ratio (26 + 23 + 21 + 20 + 1) 128 . The 7-bit data won’t be changed until the
next new data is latched. Note that the default code 7’b1000000 exists in chip memory
when power on, so the output current is equal to the half of base current.
b. Short detection voltage level selection
DM11H provides 2 voltage levels in coordination with LED short detection on system.
VCC voltage level is the default value while power-on. DAO will send an error signal = H if
the output voltage is greater than a respectively predetermined threshold value.
SV
Short Voltage
0
5/6 * VCC
1
VCC (default)
c. Sleep mode
When SLP=1, DM11H will enter sleep mode, all outputs turn off and the IDD of DM11H
will drop down to less than 5uA. This function is especially designed for battery or solar
powered system.
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 12
DM11H
Error Detection
DM11H includes Real-time and Smart detection mode for LED open/short and driver
outputs short to GND detection. It can be set as six types which are showing as following
table.
Detection Type
Real time LED Open Detection
Detection Operation
CLK rising edge x1, with LAT =H
Real time Output Short to GND Detection CLK rising edge x2, with LAT =H
Real time LED Short Detection
CLK rising edge x3, with LAT =H
Smart LED Open Detection
CLK rising edge x1, with LAT =H
then LAT falling edge x2 with CLK=H
Smart Output Short to GND Detection
CLK rising edge x2, with LAT =H
then LAT falling edge x2 with CLK=H
Smart LED Short Detection
CLK rising edge x3, with LAT =H
then LAT falling edge x2 with CLK=H
Selection of detection types is a collocation of CLK and LAT . After detection executed,
the error report will be saved in the particular shift register and could be retrieved from
serial-out(DAO) data.
For Real-Time LED open/short detections, it’s necessary to set the image data of the
particular output channel as ‘1’. The serial-out data is ‘0’ in the LED normal state, and the
serial-out data will be ‘1’ while a LED failure has occurred. If the image data is written to “0”
or the output terminal is inactive (EN =H), it will not execute any detection process for the
corresponding channel. Therefore, the serial-data will remain as “0”.
For Real-Time Output Short to GND detection type, set the image data of the particular
output channel to ‘0’, outputs’ state will be identified from DAO as above. In output normal
state, the serial-out data is ‘0’, but if the serial-out data is ‘1’ then a DM11H output voltage
lower than 0.2V. If the image data of particular channel is ‘1’, no detection will be executed
for the corresponding channel, and the serial-out data will be ’0’. Otherwise, If output enable
terminal is active (EN =’L’), the serial-out data will be ’0’.
DM11H specializes in fast detection response, 100ns minima. Moreover, it offers multi
selections like Real-Time monitor and Smart detection. Accordingly, it is more flexible and
well adapted to the system requirements.
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 13
DM11H
a. Normal operation
When DM11H operates at normal operation (Latch only) the DAO pin will send out the
original serial-in data not the error message.
SD mode
1
DAI
J [2]
J [1]
J [0]
6
7
8
Don＇care
t
L[ 7]
L[ 6]
L[ 0 ]
1
2
8
Don＇care
t
M[ 7 ]
M[ 6 ]
M[ 5]
1
2
3
0
Normal operation
high
CLK
low
high
LAT
l ow
1
DAO
I [2]
J [7]
I [1]
J [6 ]
L[ 7]
L[6 ]
L[5]
0
on
OUT0
Fr ame Data I
(current )
Fr ame Data L
Frame Data J
off
b. LED Open/Short Detection(Real-time)
Set one CLK rising edge with LAT =‘H’ to operate Open Real-Time detection. Each
channel will be identified as a LED open failure when there is a current passing through the
output but the voltage is below 0.1V.
SD Mode
DAI
LED Open
Real Time
Detection Mode
SD Mode
1
J [2]
J [1]
Don＇care
t
J [0]
L[ 5]
L[ 4]
L[ 0 ]
Don＇care
t
M[ 5 ]
M[ 4 ]
M[ 3 ]
0
6
7
8
1
1
2
8
1
2
3
CLK
High
Low
1
LAT
0
tDET
DAO
OUT0
(current )
High
I [2]
I [1]
I [0]
E[7]
E [6]
L[7]
L[ 6]
L [ 5]
Low
On
Fr ame Data I
Fr ame Data J
Fr ame Data L
Off
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 14
DM11H
Set three CLK rising edges with LAT =‘H’ to operate Short Real-Time detection. A LED
short failure will be identified when the output channel is on and the output voltage is higher
VCC.
LED Short
Real Time
Detection Mode
SD Mode
SD Mode
1
DAI
J [2]
J [1]
Don＇care
t
J [0]
L [ 7]
L[ 6 ]
L[ 0 ]
Don＇care
t
M [7]
M[6]
M[5]
0
6
7
8
1
2
3
1
2
8
1
2
3
CLK
High
Low
1
LAT
0
tDET
High
DAO
I [2]
I [0]
I [1]
E [7]
E[6]
L[7 ]
L[ 6]
L[5]
Low
On
OUT0
Frame Data I
(current )
Frame Data L
Frame Data J
Off
With the above operating principle, the controller could continuously retrieve LED
status from serial-out(DAO) then compare with the last frame date one by one . Once there
is any serial-out data at ’1’ be retrieved, it pinpoints the channel with failed LED. Since the
process is ongoing and without shifting between image and detection mode, it does not
interrupt the image data flow and the output display. This is known as “Real-Time Monitor”.
c. LED Open/Short Detection(Smart Detection)
DM11H also specially provides another ”smart” detection method. In Smart detection
mode, DM11H will automatically turns on all output channels with Iout=50uA until the next
rising edge of the CLK pulse. After the rising edge of CLK, the output current will return to
original state. Notice that enable control (EN ) won’t affect smart detection result.
Set one CLK rising edge with LAT =‘H’ then two LAT falling edges with CLK is ‘H’ to
operate Open Smart detection. Each channel will be identified as a LED open failure when
there is a current passing through the output but the voltage is below 0.1V.
SD Mode
DAI
J [2]
J [1]
J [0]
6
7
8
LED Open
Smart Detection Mode
SD Mode
Don＇care
t
L[ 7]
L[ 6]
1
2
L[ 0 ]
Don＇care
t
1
M[ 7]
M[ 6]
M[ 5 ]
1
2
3
0
1
8
CLK
High
Low
1
2
1
LAT
0
tDET
DAO
OUT0
(current )
High
I [2]
I [1]
I [0]
E[7]
E[6]
L [7 ]
L [6 ]
L [5 ]
Low
On
Fr ame Data I
Frame Data J
Frame Data L
Off
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 15
DM11H
Set three CLK rising edges with LAT =‘H’ then two LAT falling edges with CLK is ‘H’ to
operate Short Smart detection. A LED short failure will be identified when the output channel
is off and there is a current passing through the output but the voltage is above VCC.
SD Mode
DAI
J [2]
J [1]
J [0]
6
7
8
LED Short
Smart Detection Mode
SD Mode
Don＇care
t
L[ 7]
L[ 6 ]
L[ 0 ]
1
2
8
Don＇care
t
1
M[ 7 ]
M[ 6 ]
M[ 5 ]
1
2
3
0
1
2
3
CLK
High
Low
1
2
1
LAT
0
tDET
DAO
I [1]
I [2]
E[ 7]
I [0]
E[ 6]
L[7 ]
L[6 ]
High
L[ 5]
Low
OUT0
Fr ame Data I
(current )
On
Frame Data L
Fr ame Data J
Off
The error report of LED status will be retrieved from DAO. Once there is any serial-out
data at ’1’ be retrieved, controller can counts clocks to identify the locations of fail LED. The
impression of “invisible failure detection” is achievable because of less data clock-in cycle
and small current during detection to avoid a flash. After Smart detection, DM11H will return
to normal operation until next detection.
d. Outputs Short to GND Detection (Real-Time/Smart)
This error detection mode could detect the failure of IC and PCB. If IC output pins are
burned-out or output pins on PCB layout are short to ground, the voltage of IC output pins
would be pulled to low voltage. It will make LEDs turn on all the time. Therefore, DM11H
would determine the failure of IC output pins when the output voltage is below 0.1V. For the
duration of output short to GND smart detection, the output would be turned off
automatically and pulled high to VDD no matter channel is on or off.
Set two CLK rising edges with LAT =‘H’ to operate Output Short to GND Real-Time
detection. An output short failure will be identified when the output turn off but the voltage is
below 0.1V.
SD Mode
Output Short to GND
Real Time
Detection Mode
SD Mode
1
DAI
J [2]
J [1]
J [0]
6
7
8
Don＇care
t
L[ 7]
L[ 6]
1
2
L[ 0 ]
Don＇care
t
M[ 7]
M[ 6]
M[ 5 ]
2
3
0
1
2
8
1
CLK
High
Low
1
LAT
0
tDET
High
DAO
OUT0
(current )
I [2]
I [1]
I [0]
E[7]
E[6]
L [7]
L [6]
L [ 5]
Low
On
Fr ame Data I
Frame Data L
Fr ame Data J
Off
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 16
DM11H
Set two CLK rising edges with LAT =‘H’ then sending two LAT falling edges with CLK
is ‘H’ to operate Output Short to GND Smart detection. DM11H will force all outputs to turn
off automatically, and start to detect output short error until the next rising edge of CLK pulse.
After the rising edge of CLK, the output current will return to original value. After the
detection, device will return to Normal Operation. Notice that enable control (EN ) won’t
affect smart detection result.
SD Mode
DAI
J [2]
J [1]
J [0]
6
7
8
Output Short to GND
Smart Detection Mode
SD Mode
1
Don＇care
t
L[ 7]
L[ 6]
L[ 0 ]
1
2
8
Don＇care
t
M[ 7]
M[ 6 ]
M[ 5 ]
1
2
3
0
1
2
CLK
High
Low
1
2
1
LAT
0
tDET
DAO
OUT0
(current )
High
I [2]
I [1]
I [0]
E[7]
E[6]
L [7 ]
L [ 6]
L [5]
Low
On
Fr ame Data I
Fr ame Data J
Frame Data L
Off
Outputs Delay
Large in-rush currents will occur when the system activates all the outputs at once. To
prevent this effect, a constant unit of delay between outputs is built-in DM11H. All outputs
are divided into four groups and each group contains four outputs. For example, OUT0 ~
OUT3 form the group1; OUT4 ~ OUT7 form the group2. There is no delay between every
group. But each output delay between channels in a group is 3ns @VDD=3.3V (typical).
OUT 0, 4
OUT 1, 5
OUT 2, 6
OUT 3, 7
tod tod tod
8-bit Constant Current LED Driver with Error Detection
tod tod tod
Version:PRE.002
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Page 17
DM11H
Thermal Alarm and Shutdown
DM11H provides a temperature error detection circuit for thermal alarm and shutdown
protection. When junction temperature of the IC exceeds 130℃, the thermal flag(T130) will
be serial-out in the CD mode. If no cooling measures to reduce the temperature(by system),
the junction temperature might continue to rise. Once it reaches to 170℃, DM11H will turn
off all outputs. When the junction temperature is lower than 130℃, DM11H will restart
automatically. Operation in the over-temperature situation( > 130℃) for a long time may
cause chip damage permanently.
Thermal Flag
Description
130℃ temperature flag
T130
"H" : Temp ≧ 130℃,
“ L” : Temp < 130℃
170℃ temperature flag
T170
"H" : Temp ≧ 170℃,
“L” : Temp < 170℃
Shutdown Flag
Tshut
"H" : 8 outputs off,
“L” : normal operation
Normal
Normal
T130=1
170 C
130 C
Normal
Normal
T130=1
Tshut=1
T170=0,Tshut=1
T170=1
In CD mode, thermal flags will be serial-out through DAO. According to these thermal
flags, the control system can adopt proper way to protect whole display system. Please note
the thermal flags are all ‘L’ in normal operation.
SD mode
CD mode transfer
DAI
CD mode
SD mode
1
DA [1]
Don＇care
t
DA [0 ]
GBCA [6] GBCA [5]
SVA [1]
SVA [0]
SLPA
DB[7]
DB[6]
1
2
DB [1]
DB [0]
0
7
8
high
LAT
low
7
8
1
2
3
4
1
2
8
9
10
high
DCK
l ow
1
DAO
OUT0
(current )
*1
D Z[0]
DA [ 7 ]
GBC Z [6]
GBC Z [5]
SHUT Z
T130 Z
T170 Z
DA [ 7 ]
D A [ 6]
D A [ 5]
D A [0]
D B [7]
0
on
Frame Data Z
Frame Data Aa
Frame Data A*1
off
The difference between Frame data A and Aa is the max output current.
8-bit Constant Current LED Driver with Error Detection
Version:PRE.002
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Page 18
DM11H
Power Dissipation
Notice that 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:
SOP16
SSOP16
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:PRE.002
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Page 19
DM11H
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
A2
1.245
-
1.651
0.061
0.065
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 with Error Detection
Version:PRE.002
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Page 20
Package Outline Dimension
DM11H
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:PRE.002
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Page 21
DM11H
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:PRE.002
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Page 22