DM164 - Mikrocontroller.net

DM164
Version
: A.001
Issue Date
: 2007/09/04
File Name
: SP-DM164-A.001.doc
Total Pages : 28
8x3-CHANNEL 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.
Fax:886-3-5645626
Tel:886-3-5645656
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
DM164
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
General Description
The DM164 is a LED current sink driver incorporating independent shift registers and
data latches for grayscale PWM data (GD mode*1) and current adjustment data (D&G
mode*1), 8x3-channels constant current circuitry with current value set by 3 external
resistors, 65,536 grayscale PWM function unit, 128 levels current adjustment for each
channel and 256 levels global brightness control (White balance). Each channel provides
maximum current of 90mA. The DM164 also supports the LED open detection capability,
thermal alarm and shutdown function. There are two methods to communicate error
signals to the system. One is through serial output data to indicate which channel has
failure. The other is by means of dedicated Alarm pin.
Features
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
Constant current outputs with current value set by 3 external resistors.
Max PWM clock frequency
Cascade: [email protected]=3.3V(Refresh rate≒550Hz), [email protected]=5V (610Hz)
Max data clock frequency
Cascade: [email protected]=3.3V, [email protected]=5V
Maximum output current: 90mA
Maximum output voltage: 17V
16-bit grayscale for each LED
8-bit current adjustment for global brightness control (White Balance)
7-bit current adjustment for each LED (Dot Correction)
Supply Voltage: 3V to 5.5V
LED Open Detection
Thermal Alarm and Shutdown
Alarm (junction temperature >130oC)
Shutdown (junction temperature > 170oC)
One-Shot Option
Built-in Buffer for Data, PWM Clock, Latch signal and Data Clock
Average Separate IOUT PWM Waveform Option
Package
z
LQFP48 (7mmX7mm), QFN48 (7mmX7mm)
*1: See Page 10
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 1
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
Block Diagram
IOUT0
ALARM
IOUT1
IOUT23
‧‧‧
EN_B
EN_B
T130
Open
Detection
Thermal
Alarm /
Shutdown
REXT_R
Constant Current
Driver
Constant Current
Reference
REXT_G
REXT_B
Open
Detection
Constant Current
Driver
Delay00
Global
G
8-bit
DA
Global
R
8-bit
DA
Dot
Correction
7-bit DA
Global
G
Latch
8
15
Global
R
Latch
16 23
Dot
Correction
Latch
24
30
Global
B
8-bit
DA
EN_B
ONEST
16-bit
counter
Constant Current
Driver
‧‧‧
Delay01 ‧‧‧
Dot
Correction
7-bit DA
16-bit
PWM
Generator
Delay23
Dot
Correction
7-bit DA
‧‧‧
16-bit
PWM
Generator
16
Global
B
Latch
0
7
GCK
16-bit
PWM
Generator
Open
Detection
‧‧‧
0
Data
Latch
15
Data
Latch
Dot
Correction
Latch
31
37
16
Data
Latch
Dot
Correction
Latch
185 191
‧‧‧
31
365
383
192
LTH
0
DCKPH
Shift Register
191
384
GCK
MSEL
0
1
DIN
0
DCK
GCKO
1
0
PWM Data Shift Register
383
DOUT
1
0
DCKO
LTHO
DOUTPH
DISSIPATION RATINGS
PACKAGE
QFN48
LQFP48
POWER DISSIPATION
(Tj_max=150 oC)
4.00 W
2.16 W
THERMAL RESISTANCE (Rja, Ta=25oC)
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
31.22
57.86
o
o
C/W
C/W
Version:A.001
Page 2
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
Pin Description
GCK
VSS3
GCKO
MSEL
LTHO
DCKO
DOUT
42
41
40
39
38
37
VDD2
45
VSS4
LTH
46
43
DCK
47
44
DIN
48
LQFP48 (Top View)
IOUT21
IOUT1
11
26
IOUT22
IOUT0
12
25
IOUT23
DCKPH
DOUTPH
VDD1
DCK
LTH
VDD2
47
46
45
EN_B
DIN
48
24
27
ALARM
10
DOUT
IOUT2
37
IOUT20
23
IOUT19
28
REXT_B
29
9
DCKO
8
IOUT3
38
IOUT4
22
IOUT18
REXT_G
30
LTHO
7
39
IOUT5
21
IOUT17
REXT_R
31
MSEL
6
40
IOUT6
20
IOUT16
ONEST
32
GCKO
5
41
IOUT7
19
IOUT15
VSS2
33
VSS3
4
42
IOUT8
18
IOUT14
17
34
VSS1
3
IWAVE
IOUT9
GCK
IOUT13
VSS4
35
43
2
44
IOUT10
16
IOUT12
15
36
14
1
13
IOUT11
QFN48 (Top View)
IOUT17
IOUT5
7
30
IOUT18
IOUT4
8
29
IOUT19
IOUT3
9
28
IOUT20
IOUT2
10
27
IOUT21
IOUT1
11
26
IOUT22
IOUT0
12
25
IOUT23
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
ALARM
24
31
23
6
REXT_B
IOUT6
22
IOUT16
REXT_G
32
21
5
REXT_R
IOUT7
20
IOUT15
ONEST
33
19
4
VSS2
IOUT8
18
IOUT14
17
34
VSS1
3
IWAVE
IOUT9
16
IOUT13
VDD1
35
15
2
DOUTPH
IOUT10
14
IOUT12
DCKPH
36
13
1
EN_B
IOUT11
Version:A.001
Page 3
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
PIN NAME
FUNCTION
VDD1,VDD2 Power supply terminal.
VSS1~4
Ground terminal.
External resistor connected between REXT and GND
for driver current setting.
REXT_R
REXT_R controls outputs:
IOUT0, 3, 6, 9, 12, 15, 18, 21.
REXT_G
REXT_G controls outputs:
IOUT1, 4, 7, 10, 13, 16, 19, 22.
REXT_B
REXT_B controls outputs:
IOUT2, 5, 8, 11, 14, 17, 20, 23.
LED driver outputs.
IOUT12~23
LED driver outputs.
DIN
Serial input for grayscale PWM data and current
adjustment data.
Serial output for grayscale PWM data and current
adjustment data.
Synchronous clock input for serial data transfer. The
input data of DIN can be transferred at either the rising
edges of DCK or the falling edges of DCK depending
on the signal DCKPH.
Synchronous clock output for serial data transfer.
DCKO= DCK .
When DCKPH = L, input data is shifted in by rising
edge of DCK,
When DCKPH = H, input data is shifted in by falling
edge of DCK
When DOUTPH = H, DOUT is shifted out with half
DCK cycle delay
When DOUTPH = L, DOUT is shifted out without delay
Data latch input pin.
When DCKPH=L & LTH=H or DCKPH=H & LTH=L,
internal latches become transparent and PWM counter
value will be set to FFFF(h).
When DCKPH=L & LTH=L or DCKPH=H & LTH=H,
internal latches hold data.
DCK
DCKO
DCKPH
DOUTPH
LTH
21
22
23
12,11,10,9,8,7,
6,5,4,3,2,1
36,35,34,33,32,31
30,29,28,27,26,25
IOUT0~11
DOUT
QFN48 / LQFP48
pin number
16,45
18,19,42,43
48
37
47
38
14
15
46
LTHO
Data latch output pin. LTHO= LTH
39
GCK
Clock input for PWM operation. When DCKPH=L
(DCKPH=H), the internal PWM counter will count up
with rising (falling) edge of GCK.
44
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 4
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
GCKO
EN_B
MSEL
ALARM
IWAVE
ONEST
GCKO= GCK
Clock output.
41
Blank all outputs.
When EN_B = H, all outputs are forced OFF.
When EN_B = L, all outputs are controlled by
grayscale PWM control.
When MSEL = H, the device is operated in
Dot Correction Data & Global Brightness Control Data
Input Mode (D&G mode).
When MSEL = L, the device is operated in
Grayscale PWM Data Input Mode (GD mode).
Output open drain terminal for an alarm function.
when EN_B = L, It will go low as LED open
when EN_B = H, It will go low as chip overheated.
When IWAVE = H, traditional Iout waveform.
When IWAVE = L, average separate Iout waveform.
When ONEST = H, one-shot function is enabled.
When ONEST = L, one-shot function is disabled.
13
40
24
17
20
Maximum Ratings (Ta=25°C, Tj(max) = 150°C)
CHARACTERISTIC
SYMBOL
Supply Voltage
Input Voltage
Output Current
Output Voltage
DCK Frequency
FDCK
GCK Frequency
FGCK
GND Terminal Current
Power Dissipation
Thermal Resistance
Operating Temperature
Storage Temperature
VDD
VIN
IOUT
VOUT
RATING
UNIT
-0.3 ~ 7.0
-0.3 ~ VDD+0.3
90
-0.3 ~ 17
Cascade Vdd=5V
35
Vdd=3.3V
Cascade Vdd=5V
40
Vdd=3.3V
IGND
PD
Rth(j-a)
Top
Tstg
V
V
mA
V
MHz
30
36
MHz
2200
4.00 ( QFN48); 2.16 (LQFP48) (Ta=25°C)
31.22 ( QFN48 ); 57.86 (LQFP48)
-40 ~ 85
-55 ~ 150
mA
W
℃/W
℃
℃
Recommended Operating Condition
DC Characteristics (Ta = 25°C)
CHARACTERISTIC
Supply Voltage
Output Voltage
Output Current
Input Voltage
SYMBOL
CONDITION
VDD
VOUT
IO
IOH
IOL
VIH
VIL
⎯
⎯
OUTn
SERIAL-OUT
SERIAL-OUT
⎯
⎯
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
MIN.
TYP.
MAX.
UNIT
3
⎯
⎯
⎯
⎯
⎯
⎯
⎯
5.5
17
90
V
V
⎯
⎯
mA
⎯
⎯
⎯
⎯
0.7 VDD
-0.2
Version:A.001
VDD+0.2
0.3 VDD
V
Page 5
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
AC Characteristics (VDD = 5.0 V, Ta = 25°C, REXT = 3.9kΩ)
CHARACTERISTIC
DCK Frequency
DCK pulse duration
DCK rise/fall time
GCK Frequency
GCK pulse duration
GCK rise/fall time
SYMBOL
CONDITION
MIN.
TYP.
MAX.
UNIT
FDCK
⎯
⎯
⎯
⎯
⎯
⎯
⎯
13
5
⎯
12
5
35
⎯
⎯
40
⎯
Trgk/ Tfgk
Cascade operation
High or low level
Single, CLoad=13pF
Cascade operation
High or low level
Single, CLoad=13pF
⎯
MHz
ns
ns
MHz
ns
ns
Set-up Time for DIN
Tsu0
Before DCK rising edge
⎯
10
⎯
ns
Hold Time for DIN
Th0
After DCK rising edge
⎯
10
⎯
ns
Twhdk / Twldk
Trdk/ Tfdk
FGCK
Twhgk / Twlgk
Tsu1
Before LTH falling edge
⎯
30
⎯
ns
TwLTH
⎯
⎯
15
⎯
ns
Set-up Time for LTH
Tsu2
Before GCK rising edge
⎯
10
⎯
ns
Set-up Time for MSEL
Tsu3
Before DCK rising edge
⎯
10
⎯
ns
Hold Time for MSEL
Th3
After DCK rising edge
⎯
30
⎯
ns
Set-up Time for DCK
LTH Pulse Width
AC Characteristics (VDD = 3.3 V, Ta = 25°C, REXT = 3.9kΩ)
CHARACTERISTIC
DCK Frequency
DCK pulse duration
DCK rise/fall time
GCK Frequency
GCK pulse duration
GCK rise/fall time
SYMBOL
CONDITION
MIN.
TYP.
MAX.
UNIT
FDCK
⎯
⎯
⎯
⎯
⎯
⎯
⎯
15
4
⎯
13
4
30
⎯
⎯
36
⎯
⎯
MHz
ns
ns
MHz
ns
ns
Trgk/ Tfgk
Cascade operation
High or low level
Single, CLoad=13pF
Cascade operation
High or low level
Single, CLoad=13pF
Set-up Time for DIN
Tsu0
Before DCK rising edge
⎯
10
⎯
ns
Hold Time for DIN
Th0
After DCK rising edge
⎯
10
⎯
ns
Twhdk / Twldk
Trdk/ Tfdk
FGCK
Twhgk / Twlgk
Tsu1
Before LTH falling edge
⎯
30
⎯
ns
TwLTH
⎯
⎯
15
⎯
ns
Set-up Time for LTH
Tsu2
Before GCK rising edge
⎯
10
⎯
ns
Set-up Time for MSEL
Tsu3
Before DCK rising edge
⎯
10
⎯
ns
Hold Time for MSEL
Th3
After DCK rising edge
⎯
30
⎯
ns
Set-up Time for DCK
LTH Pulse Width
See Page 9: Timing Diagram
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 6
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
Electrical Characteristics (VDD = 5.0 V, Ta = 25°C unless otherwise noted)
CHARACTERISTIC
SYMBOL
CONDITION
MIN.
TYP.
MAX.
Input Voltage “H” Level
Input Voltage “L” Level
Output Leakage Current
VIH
VIL
Ileak
⎯
⎯
0.7 VDD
GND
VDD
0.3 VDD
± 0.1
Output Voltage ( DOUT)
VOL
VOH
⎯
⎯
⎯
⎯
⎯
⎯
V
Output Current
(Channel-Channel)
IOL1
⎯
±1
±3
%
Output Current
(Chip-Chip)
IOL3
⎯
⎯
±6
%
Output Voltage
Regulation
% / Vout
⎯
± 0.1
± 0.5
%/V
13
mA
IDD, analog
1
Supply Current
VOUT = 17 V
IOL = 2 mA
IOH = -2 mA
VOUT = 1.0V
REXT = 3.9kΩ
VOUT = 1.0V
REXT = 3.9kΩ
REXT = 3.9kΩ
Vout = 1.0~3.0V
VDD=5.0V, REXT = 3.9kΩ
, REXT = 1.4kΩ
VDD=3.3V, REXT = 3.9kΩ
, REXT = 1.4kΩ
Cload=2pF,
IDD, digital DCK=GCK=10MHz
VDD=5.0V
VDD=3.3V
⎯
⎯
UNIT
V
uA
⎯
⎯
⎯
⎯
⎯
⎯
2.4
1.8
⎯
⎯
⎯
⎯
⎯
⎯
MIN.
TYP.
MAX.
UNIT
⎯
5
10
ns
⎯
5
10
ns
⎯
8
30
ns
⎯
8
30
ns
34
12
33
Switching Characteristics (VDD = 5.0V, Ta = 25°C)
CHARACTERISTIC
SYMBOL
DOUT Rise time
tr
DOUT Fall time
tf
IOUT Rise time
tr
IOUT Fall time
tf
CONDITION
VIH=VDD
VIL=GND
REXT=3.9kΩ
CL=13pF
VIH=VDD, VIL=GND
REXT=3.9kΩ
VLED=5.0V
RL=100Ω, CL=33pF
10% to 80%
DOUT
Tplh0
After DCK rising edge
⎯
28
⎯
ns
DOUT
Tphl0
After DCK rising edge
⎯
28
⎯
ns
DCKO
Tplh1
After DCK falling edge
⎯
14
⎯
DCKO
Tphl1
After DCK rising edge
⎯
17
⎯
ns
ns
LTHO
Tplh2
After LTH falling edge
⎯
14
⎯
ns
LTHO
Tphl2
After LTH rising edge
⎯
17
⎯
ns
GCKO
Tplh3
After GCK falling edge
⎯
16
⎯
ns
GCKO
Tphl3
After GCK rising edge
⎯
16
⎯
ns
IOUT0 (turn on)
Tplh4
After GCK rising edge
⎯
30
⎯
ns
IOUT0 (turn off)
Tphl4
After GCK rising edge
⎯
31
⎯
ns
IOUT0 (turn on)
Tplh5
After EN_B falling edge
⎯
27
⎯
ns
IOUT0 (turn off)
Tphl5
After EN_B rising edge
⎯
25
⎯
ns
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 7
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
Switching Characteristics (VDD = 3.3V, Ta = 25°C)
CHARACTERISTIC
SYMBOL
DOUT Rise time
tr
DOUT Fall time
tf
IOUT Rise time
tr
IOUT Fall time
tf
CONDITION
VIH=VDD
VIL=GND
REXT=3.9kΩ
CL=13pF
VIH=VDD, VIL=GND
REXT=3.9kΩ
VLED=5.0V
RL=100Ω, CL=33pF
10% to 80%
MIN.
TYP.
MAX.
UNIT
⎯
4
10
ns
⎯
4
10
ns
⎯
12
30
ns
⎯
12
30
ns
After DCK rising edge
⎯
35
⎯
DOUT
Tphl0
After DCK rising edge
⎯
35
⎯
ns
ns
DCKO
Tplh1
After DCK falling edge
⎯
21
⎯
ns
DCKO
Tphl1
After DCK rising edge
⎯
19
⎯
ns
LTHO
Tplh2
After LTH falling edge
⎯
20
⎯
ns
LTHO
Tphl2
After LTH rising edge
⎯
20
⎯
ns
GCKO
Tplh3
After GCK falling edge
⎯
23
⎯
ns
GCKO
Tphl3
After GCK rising edge
⎯
23
⎯
ns
DOUT
Tplh0
IOUT0 (turn on)
Tplh4
After GCK rising edge
⎯
42
⎯
ns
IOUT0 (turn off)
Tphl4
After GCK rising edge
⎯
41
⎯
ns
IOUT0 (turn on)
Tplh5
After EN_B falling edge
⎯
39
⎯
ns
IOUT0 (turn off)
Tphl5
After EN_B rising edge
⎯
33
⎯
ns
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 8
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
Timing Diagram
MODE
Twhdk
Th3
Tsu3
DCK
Tsu0
Th0
Tsu1
DIN
TwLTH
LTH
Tphl1
Tplh1
DCKO
Tplh0
Tphl0
DOUT
Tphl2
Tplh2
LTHO
Tsu2
GCK
Tphl3
Tplh3
GCKO
Tphl4
Tplh4
IOUT0
(current)
Tphl5
Tplh5
EN_B
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 9
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
Serial Data Interface
The DM164 includes a flexible data transfer interface. The data can be transferred from
DIN pin to the shift registers at either the rising edge of DCK or the falling edge of DCK
depending on the signal DCKPH. After all data are clocked in, a high level LTH signal can
transfer the serial data to the data latches (Level Sensitive). The serial data format can be
192-bit or 384-bit wide, depending on the operating mode of the device.
Operating Modes
The DM164 has two operating modes depending on the signal MSEL. Table 1 shows the
available operating modes. When MSEL = H, the device operates at the D&G mode. D&G
mode is used to set dot correction data and global brightness control data after IC power
up or any time. When MSEL = L, the device becomes GD mode. GD mode is used to set
grayscale PWM data after D&G mode.
MSEL
H
L
Table 1. Two Operating Modes
MODE
Dot Correction Data & Global Brightness Control
Data Input Mode (D&G mode)
Grayscale PWM Data Input Mode (GD mode)
SHIFT REGISTER
192-bit
384-bit
D&G Mode Data Format
At D&G mode, dot correction data of all channels and global brightness control data of
different colors are transferred into the chip at the same time. The complete dot correction
data format consists of 24 x 7-bit and the global brightness control data of three different
colors consists of 3 x 8-bit. The total shift registers width at D&G mode is 192-bit. All data
is clocked in with MSB first. Figure 1 shows the D&G mode data format.
MSB
191
IOUT23
DC6
185
‧‧‧
IOUT23
184
IOUT23 IOUT22
DC0
DC6
31
‧‧‧
30
IOUT01 IOUT00
DC0
DC6
IOUT22~IOUT01
‧‧‧
IOUT00
24
23
IOUT00
DC0
GB_R7
‧‧‧
16
15
GB_R0
GB_G7
GLOBAL_R
‧‧‧
GLOBAL_G
LSB
0
8
7
GB_G0
GB_B7
‧‧‧
GB_B0
GLOBAL_B
Figure 1. D&G Mode Data Format (D&G[191:0])
To operate the DM164 in D&G mode, MSEL must be set to high. The shift register width is
then set to 192-bit wide. The input data can be transferred at either the rising edge of DCK
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 10
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
or the falling edge of DCK by setting DCKPH to L or H. After all data are transferred into
the D&G mode shift registers, the D&G mode data can be latched from shift registers to
the data latches by a LTH signal at either D&G mode or GD mode. Figure 2 shows the
D&G mode data input timing chart.
D&G mode
DCKPH
GD mode
GND
MSEL
DIN
D&G[191]
DCK
D&G[190]
1
D&G[189]
2
D&G[0]
3
GD[383]
GD[382]
192
DOUT
D&G[191]
(DOUTPH=L)
DOUT
D&G[191]
(DOUTPH=H)
LTH
Figure 2. D&G Mode Data Input Timing Chart
GD Mode Data Format
At GD mode, the grayscale PWM data will be transferred to the shift registers. The
complete grayscale PWM data format consists of 24 x 16-bit. The total shift registers width
at GD mode is 384-bit. All grayscale PWM data is clocked in with MSB first. Figure 3
shows the GD mode data format.
MSB
383
IOUT
23-15
‧‧‧
IOUT23
368
IOUT
23-0
367
IOUT
22-15
366
IOUT
22-14
‧‧‧
17
IOUT
01-1
16
IOUT
01-0
15
IOUT
00-15
IOUT22 ~ IOUT01
‧‧‧
LSB
0
IOUT
00-0
IOUT00
Figure 3. GD Mode Data Format (GD[383:0])
When MSEL is set to low, the DM164 enters GD mode. The internal shift registers
changes to 384-bit wide. The input data can be transferred at either the rising edge of DCK
or the falling edge of DCK by setting DCKPH to L or H. After all data are transferred into
the GD mode shift registers, the GD mode data can be latched from shift registers to the
data latches by a LTH signal at GD mode only. Figure 4 shows the GD mode data input
timing chart.
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
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DM164
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D&G
mode
GD mode
MSEL
DIN
D&G[0]
DCK
(DCKPH=L)
DCK
(DCKPH=H)
GD[383]a
GD[0]a
GD[382]a
GD[383]b
GD[0]b
GD[382]b
192
1
2
384
1
2
384
192
1
2
384
1
2
384
ER[382]a
ER[381]a
10 GCK Latencies
LTH
DOUT
GD[383]a
(DOUTPH=L)
DOUT
GD[383]a
(DOUTPH=H)
ER[383]a
ER[383]a
ER[382]a
ER[0]a
ER[0]a
Figure 4. GD Mode Data Input Timing Chart
Thermal Alarm and Shutdown
The DM164 provides a temperature error detection circuit, when EN_B=H and the junction
temperature of the IC reaches about 130oC, a T130 signal will change the ALARM pin to
low level. At this moment, the system should start up the fan or decrease the output
currents to lower the junction temperature. If the system has not any protected circuit, the
junction temperature might continue to rise. Once it reaches approximately above 170oC, a
T170 signal and a Shutdown signal will cause the driver to shutdown all the outputs, the
ALARM pin remains in low level. Basically, the IC will cool down and return to the safe
operating temperature approximately below 130oC. When the operating temperature below
130oC, the ALARM pin will reset to high level, disable the warning, and restart all the
outputs. Operation in the thermal situation for a long time may cause chip damage
permanently. The thermal error signals (T130, T170, Shutdown) can be transferred out
from DOUT pin.
Normal
Normal
Alarm
130 C
T130 =“L"
T170 =“L"
Normal
Normal
170 C
T130 =“H"
T170 =“L"
T130 =“H"
T170 =“H"
Alarm
Alarm + Shutdowm
Figure 5. Thermal Alarm and Shutdown
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
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DM164
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Open Detection
If there is any one of the 24 LEDs open or disconnected, the DM164 can detect and report
the error. The open detection circuit works when the following two conditions are met
simultaneously:
1. IOUTn is on (IOUTn > 200ns and EN_B=”L”).
2. When the output voltage at IOUTn is less than 0.2 V
The open error signal (OPE) has two methods to communicate the error signals to the
system. One is through serial output data to indicate which channel has failure (OPEn=H
=> IOUTn is open). The other is by means of dedicated Alarm pin when EN_B=L.
Status Information Output
When the DM164 operates at GD mode, after the LTH signal latches the input data from
shift registers to the data latches, the shift registers data will be replaced by the status
information. The status information includes the thermal error signals (Shutdown, T130
and T170,), open error signals (OPE) and dot correction data (DC), which will be
transferred out from DOUT pin. Figure 6 shows the status information format.
(a. IOUT shut down => Shut down=L, b. Tj>130℃ => T130=H, c. Tj>170℃ => T170=H)
MSB
383
DC[6]
23
...
...
376
375
374
373
...
368
367
DC[0] OPE
23
23
Shut
down
T130
T170
...
X
DC[6]
22
377
DC IOUT23
...
...
360
359
...
352
351
DC[0] OPE
22
22
X
...
X
DC[6]
21
361
DC IOUT22
8-bit
8-bit
DC[6]
20
...
...
327
...
320
319
DC[0] OPE
20
20
X
...
X
DC[6]
19
DC IOUT20
Reserved
DC[6]
02
...
...
41
...
336
DC[0] OPE
21
21
X
...
X
...
...
16-bit
312
311
...
304
303
DC[0] OPE
19
19
X
...
X
DC[6]
18
313
Reserved
8-bit
DC IOUT19
8-bit
47
343
16-bit
328
329
...
344
345
DC IOUT21
8-bit
16-bit
335
Reserved
...
Reserved
...
...
296
295
...
288
DC[0] OPE
18
18
X
...
X
297
DC IOUT18
8-bit
Reserved
8-bit
16-bit
16-bit
16-bit
‧
‧
‧
‧
‧
‧
‧
‧
‧
40
DC[0] OPE
02
02
DC IOUT02
39
...
32
31
X
...
X
DC[6]
01
Reserved
8-bit
...
...
25
24
DC[0] OPE
01
01
DC IOUT01
...
16
15
X
...
X
DC[6]
00
Reserved
8-bit
16-bit
23
...
...
9
8
DC[0] OPE
00
00
DC IOUT00
7
...
0
X
...
X
Reserved
8-bit
16-bit
16-bit
Figure 6. Status Information Data Format (ER[383:0])
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
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DM164
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In order to catch correct open error signals. DCK must wait for at least 10 GCK latencies
after the LTH signal latches the input data. Figure 7 shows the timing chart.
GD mode
MSEL
DIN
GND
GD[383]a
DCK
(DCKPH=L)
DCK
(DCKPH=H)
GD[382]a
GD[0]a
GD[383]b
GD[0]b
GD[382]b
1
2
384
1
2
384
1
2
384
1
2
384
ER[382]a
ER[381]a
10 GCK Latencies
LTH
GCK
DOUT
ER[383]a
GD[383]a
(DOUTPH=L)
DOUT
GD[383]a
(DOUTPH=H)
ER[383]a
ER[382]a
ER[0]a
ER[0]a
Figure 7. Open Error Signals Timing Chart
IOUT Delay & EN_B Delay
The DM164 provides delay circuits between IOUTs. All IOUTs are divided into eight groups
and every three outputs of different colors form a group. For example, IOUT0 IOUT1 and
IOUT2 form the group1; IOUT3 IOUT4 and IOUT5 form the group2. The delay time
between every group is half GCK cycle time. Each IOUT delay in the same group is 5ns
(typical). Figure 8 shows the IOUT delay timing chart. Besides the iout delay, the EN_B is
also associated with GKC signal. When EN_B goes high and GCK keeps going, then each
group of IOUTs will turn off one by one depending on the GCK sequence. If EN_B goes
high but GCK stops going, then the IOUTs will not turn off normally.
LTH
GCK
IO U T 0
G ro u p 1
1
2
G ro u p 8
6
H a lf G C K
C y c le
5ns
IO U T 4
IO U T 2 1
5
5ns
IO U T 3
IO U T 5
4
5ns
IO U T 1
IO U T 2
G ro u p 2
3
1 G C K L a te n c y
5ns
.
.
.
.
.
.
5ns
IO U T 2 2
5ns
IO U T 2 3
Figure 8. IOUT Delay Timing Chart
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
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8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
IOUT21,22,23
IOUT18,19,20
IOUT15,16,17
IOUT12,13,14
IOUT 9,10,11
IOUT 6, 7, 8
IOUT 3, 4, 5
IOUT 0, 1, 2
EN_B
Internal
counter
GCK
LTH
DCK
DIN
1
GD[383]a
384
GD[0]a
65535
1
2
4.5 GCK
Latency
4 GCK
Latency
3.5 GCK
Latency
3 GCK
Latency
2.5 GCK
Latency
2 GCK
Latency
1.5 GCK
Latency
1 GCK
Latency
0
3
4
5
Iout Delay & EN_B Delay Waveform
6
7
8
9
1
GD[383]b
65534
384
GD[0]b
65535
0
1
3
3
4
5
點晶科技股份有限公司
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DM164
Version:A.001
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DM164
SILICON TOUCH TECHNOLOGY INC.
One-Shot Option
The DM164 provides an option that users can make the output turn on for just a PWM
cycle time, i.e. in the GD mode, after a LTH signal, the output only turn on for 65536 TGCK
time. After 65536 TGCK, the output will automatically turn off. This is called One-Shot
function. Figure 9 shows the difference between One-Shot or not. When ONEST = H,
one-shot function is enabled. The output will just turn on at 1st PWM cycle. When ONEST =
L, one-shot function is disabled. The output will repeat at every PWM cycle.
GD mode
MSEL
GND
DCKPH
GND
DIN
GD[383]
DCK
1
GD[0]
384
LTH
GCK
Internal
counter
65535
0
1
65535
1st PWM cycle
0
1
65535
2nd PWM cycle
0
1
65535
3rd PWM cycle
IOUT0
(ONEST=H)
IOUT0
(ONEST=L)
Figure 9. One-Shot Operation
Grayscale PWM Operation
When DCKPH=L, the grayscale PWM cycle starts with the falling edge of LTH (see Figure
10). A LTH = H signal will set the 16-bit PWM counter value to FFFFh. The first GCK pulse
after LTH increases the PWM counter by one and switches on all IOUT with grayscales
value not zero. Each following rising edge of GCK increases the PWM counter by one. The
DM164 compare the grayscale PWM value of each output IOUT with grayscale counter
value. If the grayscale PWM value is larger than grayscale counter value, the IOUT will
switch on.
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
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DM164
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D&G Mode Data
Input Cycle
1st GD Mode
Data Input Cycle
2nd GD Mode
Data Input Cycle
MSEL
DCK
1
384
1
LTH
GCK
16-bit
COUNTER
...
FF
FFh
0
?
FF
FFh
0
?
FFFFh
FF
FFh
0
FF
FFh
0
1 GCK cycle
0
1 GCK cycle
IOUT0
(ONEST=L)
IOUT0
(ONEST=H)
< 65536 GCK cycle
65536 GCK cycle
65536 GCK cycle
Figure 10. Grayscale PWM Operation
Maximum Output Current
The maximum output current is set by an external resistor. The resistor is connected
between Rext 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 maximum output current (Imax) value can be calculated roughly by the following
equation:
Vrext (V)
× 64
Imax ≅
Rrext (Ω)
where:
Vrext = 1.23V
Rrext = external resistor.
Global Brightness Control
The global brightness control function can adjust the global current of each color
independently. The output current (Iglobal) can be adjusted in 256 steps from
((1/256)*100)% to 100% of the maximum output current. The following equation can
calculate the global brightness control current (Iglobal)
Iglobal ≅
GB+1
× Imax
256
where:
Imax = the maximum output current.
GB = the global brightness control value for different colors.
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
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DM164
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Dot Correction
Besides global brightness control, the DM164 also has the capability to adjust the output
current of each channel IOUT00 to IOUT23 independently. The output current (Idot) can be
adjusted in 128 steps from ((1/128)*100) % to 100% of the global brightness control
current. The following equation can calculate the dot correction current (Idot)
Idot ≅
DC+1
DC+1
GB+1
× Iglobal ≅
×
× Imax
128
128
256
where:
Iglobal = the global brightness control current
DC = the dot correction value for each output.
Average Separate IOUT Waveform
The DM164 incorporates a different PWM counter, hence the IOUT waveform demonstrate
a very different characteristics compare to conventional PWM counter. In the DM164,
when IWAVE=”L,” the IOUT waveform is averagely divided into 32(maximum) sections.
Figure 11 shows the difference between traditional IOUT waveform and particular IOUT
waveform.
Traditional
IOUT = 2 GCK cycle
(2 / 65536)*100% Luminance
(IWAVE="H")
Particular
t
(IWAVE="L")
Traditional
IOUT = 4 GCK cycle
(4 / 65536)*100% Luminance
(IWAVE="H")
Particular
IOUT = 8 GCK cycle
Traditional
(8 / 65536)*100% Luminance
(IWAVE="H")
Particular
‧
‧
‧
‧
‧
‧
IOUT = 32 GCK cycle
‧
‧
(32 / 65536)*100% Luminance
‧
Particular
(IWAVE="H")
t
t
(IWAVE="L")
Traditional
t
t
(IWAVE="L")
(IWAVE="H")
t
t
(IWAVE="L")
Traditional
t
IOUT = 64 GCK cycle
‧
‧
‧
(64 / 65536)*100% Luminance
Particular
t
t
(IWAVE="L")
Figure 11. Average Separate IOUT Waveform
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
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Output Current vs. External Resistor
Output Current Performance vs. Output Voltage
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Application Diagram
a) DCK LTH and GCK signals: Global Connected
* Each DCKPH input pin of all chips should be connected to the same voltage level.
Figure 12 shows that all DCKPH pins are connected to VSS.
Vled
...
VDD
...
Chip 01
VSS
Chip 02
Chip 03
Chip 04
VDD
IOUT0
VDD
IOUT0
VDD
IOUT0
VDD
IOUT0
REXT_R
IOUT1
REXT_R
IOUT1
REXT_R
IOUT1
REXT_R
IOUT1
REXT_G
IOUT2
REXT_G
IOUT2
REXT_G
IOUT2
REXT_G
IOUT2
REXT_B
‧
‧
‧
REXT_B
‧
‧
‧
REXT_B
‧
‧
‧
REXT_B
‧
‧
‧
VSS
‧
‧
‧
VSS
IOUT23
EN_B
‧
‧
‧
VSS
IOUT23
EN_B
ONEST
VSS
ONEST
DOUTPH
DOUTPH
DCKPH
‧
‧
‧
IOUT23
EN_B
ONEST
DOUTPH
DCKPH
‧
‧
‧
IOUT23
EN_B
ONEST
DOUTPH
DIN
...
...
DCKPH
DCKPH
GCKI
GCKO
GCKI
GCKO
GCKI
GCKO
GCKI
LTHI
LTHO
LTHI
LTHO
LTHI
LTHO
LTHI
LTHO
DCKI
DCKO
DCKI
DCKO
DCKI
DCKO
DCKI
DCKO
DIN
DOUT
DIN
DOUT
DIN
DOUT
DIN
DOUT
GCKO
DOUT
DCKI
LTHI
GCKI
DOUTPH
ONEST
EN_B
Figure 12. DCK LTH and GCK signals: Global Connected
b) DCK LTH and GCK signals: Cascade Connected
* DCKPH input pins of odd stages (Chip01, Chip03…) and even stages (Chip02,
Chip04…) should be connected to different voltage level. Figure 13 shows that
CLKPH pins of odd stages are connected to VSS, and CLKPH pins of even stages
are connected to VDD.
Vled
...
VDD
...
Chip 01
VSS
Chip 02
Chip 03
Chip 04
VDD
IOUT0
VDD
IOUT0
VDD
IOUT0
VDD
IOUT0
REXT_R
IOUT1
REXT_R
IOUT1
REXT_R
IOUT1
REXT_R
IOUT1
REXT_G
IOUT2
REXT_G
IOUT2
REXT_G
IOUT2
REXT_G
IOUT2
REXT_B
‧
‧
‧
REXT_B
‧
‧
‧
REXT_B
‧
‧
‧
VSS
EN_B
GCKI
LTHI
DCKI
DIN
...
...
IOUT23
‧
‧
‧
VSS
EN_B
‧
‧
‧
IOUT23
VSS
EN_B
‧
‧
‧
IOUT23
REXT_B
VSS
EN_B
ONEST
ONEST
ONEST
ONEST
DOUTPH
DOUTPH
DOUTPH
DOUTPH
DCKPH
DCKPH
DCKPH
‧
‧
‧
‧
‧
‧
IOUT23
DCKPH
GCKO
GCKI
GCKO
GCKI
GCKO
GCKI
GCKO
GCKI
LTHI
LTHO
LTHI
LTHO
LTHI
LTHO
LTHI
LTHO
DOUT
DCKO
DCKO
DOUT
DOUT
DCKI
DCKO
DCKI
DCKO
DCKI
DCKO
DCKI
DIN
DOUT
DIN
DOUT
DIN
DOUT
DIN
GCKO
DOUTPH
ONEST
EN_B
Figure 13. DCK LTH and GCK signals: Cascade Connected
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DM164
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c) 10~15-bit PWM Grayscale Application
When the DM164 operates at n-bit PWM grayscale application, where n is less than 16.
The 16-bit GD mode data format of each channel is showed below:
n-bit PWM Data
PWM
MSB
PWM
MSB-1
Data
[n-1]
Data
[n-2]
‧‧‧
PWM
LSB+1
PWM
LSB
Data
[1]
Data
[0]
k-bit Dummy Data
0
0
‧‧‧
n-bit
k-bit
16-bit
The k-bit LSB of 16-bit GD mode data of each channel must be filled with all “0”. ( k=16-n)
For example:
When the DM164 operates at 14-bit PWM grayscale application, the 2-bit LSB of the 16-bit
GD mode data must be filled with “0”. The 16-bit data format is showed below:
14-bit PWM Data
PWM
MSB
PWM
MSB-1
Data
[13]
Data
[12]
PWM
LSB+1
PWM
LSB
Data
[1]
Data
[0]
‧‧‧
2-bit
Dummy Data
0
14-bit
0
2-bit
16-bit
Figure 14 shows the timing diagram when the DM164 operates at n-bit PWM grayscale
application. The frame cycle of n-bit PWM grayscale application can be controlled by GCK
and LTH signals.
D&G
mode
GD mode
MSEL
DIN
D&G[0]
DCK
(DCKPH=L)
DCK
(DCKPH=H)
GD[383]a
GD[0]a
GD[382]a
GD[383]b
GD[382]b
GD[0]b
192
1
2
384
1
2
384
192
1
2
384
1
2
384
10 GCK Latencies
LTH
GCK
...
...
2 n GCK cycles
Figure 14. Operating at n-bit PWM Grayscale Application Timing Diagram
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d) Power-on Reset Suggestion
The DM164 doesn’t built-in automatic power-on reset function. In order to make sure the
DM164 can work normally after the power-on situation. Users can add an LTH pulse
before normal operation, like Figure 15 shows.
a. D&G Mode First
POWER-ON
NORMAL OPERATION
VDD
D&G Mode
GD Mode
MSEL
DIN
D&G[191]
DCK
(DCKPH=L)
DCK
At Least 10
GCK Latencies
(DCKPH=H)
LTH
D&G[190]
GD[383]
GD[382]
GD[0]
1
2
192
1
2
384
1
2
192
1
2
384
10 GCK
Latencies
…
GCK
D&G[0]
…
…
…
…
EN_B
b. GD Mode First
POWER-ON
NORMAL OPERATION
VDD
GD Mode
D&G Mode
MSEL
DIN
DCK
(DCKPH=L)
DCK
(DCKPH=H)
LTH
GCK
At Least 10
GCK Latencies
…
GD[383]
GD[382]
1
2
384
1
2
192
1
2
384
1
2
192
GD[0]
D&G[191]
D&G[0]
D&G[190]
10 GCK
Latencies
…
…
…
…
VDD
Figure 15. Power-on Reset Suggestion Timing Diagram
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 22
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
(DOUTPH=H)
DOUT
(DOUTPH=L)
1
192N
384N
384N
1
1
GD[383]N_A
GD[383]N_A
GD[383]N_A
GD[0]1_A
GD Mode of Frame A
2. GD Mode First
D&G[191]N_A
D&G[191]N_A
1
GD[383]N_A
192N
D&G[0]1_A
GD[383]N_A
GD[383]N_A
10 GCK
Latencies
1
1
192N
2
D&G[191]N_A
D&G[191]N_A
192N
D&G[0]1_A
2[23]
GD[383]N_A
GD[383]N_A
D&G[0]1_A
D&G[191]N_B
ER[383]N_A
ER[382]N_A
ER[381]N_A
2
2
GD[382]N_B
ER[382]N_A
1
1
GD[383]N_B
384N
384N
n-1[23]
...
2
2
D&G[190]N_A
D&G[190]N_A D&G[189]N_A
1
1
D&G[191]N_B
D&G[0]1_A D&G[191]N_B
192N
192N
D&G[0]1_B
GD[383]N_B
GD[383]N_B
D&G[0]1_A
DOUTN
GD[383]N_B
GD[383]N_B
10 GCK
Latencies
GD[0]1_B
D&G Mode of Frame B
D&G[191]N_A
D&G[191]N_A
384N
384N
ER[0]1_A
ER[0]1_A
D&G[191]N_B D&G[190]N_B
ER[382]N_A
ER[381]N_A
2
2
n[23]
N DM164
n[0]
GD Mode of Frame B
N-1 DM164
...
GD[382]N_B
GD[383]N_B
GD[383]N_B
GD[0]1_B
ER[383]N_A
ER[0]1_A
ER[0]1_A
GD Mode of Frame B
ER[383]N_A
10 GCK
Latencies
D&G[190]N_A
1
1
GD[383]N_B
...
n-1[0]
D&G[191]N_B ER[383]N_A ER[382]N_A
192N
2
D&G[0]1_A
192N
D&G[0]1_B
2
D&G[190]N_A D&G[189]N_A
1
1
D&G[191]N_A
D&G[191]N_A
...
2 DM164
2[0]
D&G Mode of Frame B
1 DM164
1[23]
D&G[191]N_B D&G[190]N_B
2
D&G[191]N_A D&G[190]N_A
D&G Mode of Frame A
384N
384N
GD[0]1_A
GD Mode of Frame A
DIN
...
SILICON TOUCH TECHNOLOGY INC.
DOUT
LTH
(DCKPH=H)
DCK
(DCKPH=L)
DCK
DIN
MSEL
(DOUTPH=H)
DOUT
(DOUTPH=L)
DOUT
LTH
(DCKPH=H)
DCK
(DCKPH=L)
DCK
DIN
MSEL
D&G Mode
of Frame A
1. D&G Mode First
1[0]
點晶科技股份有限公司
DM164
Mode Transfer Operation Timing Diagram (N Chip Cascade)
Page 23
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
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)
Power Dissipation Pd ( W )
The relationship between power dissipation and operating temperature can be refer to the
figure below:
QFN48
4.0
Tj(max)=150 oC
Rja(QFN48)=31.22 oC/W
3.0
Rja(LQFP48)=57.86 oC/W
LQFP48
2.0
1.0
0.0
0
20
40
60
80
100
120
140
o
Ambient Temperature Ta ( C )
Based on the Pd(max), the maximum allowable voltage of output terminal can be
determined by the following equation:
Vout0 x Iout0 x Duty0 + . . . + Vout23 x Iout23 x Duty23 < Pd(max) – VDD x IDD
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 24
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
Package Outline Dimension
LQFP48
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 25
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
QFN48
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 26
點晶科技股份有限公司
DM164
SILICON TOUCH TECHNOLOGY INC.
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.
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
Version:A.001
Page 27