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DM621 Schematic ( PDF Datasheet ) - SiTi

Teilenummer DM621
Beschreibung 12-CHANNELS PRE-PROGRAMMABLE CONSTANT CURRENT LED DRIVER
Hersteller SiTi
Logo SiTi Logo 




Gesamt 22 Seiten
DM621 Datasheet, Funktion
DM621
Version
: A.007
Issue Date : 2010/08/03
File Name : SP-DM621-A.007.doc
Total Pages : 22
12-CHANNELS PRE-PROGRAMMABLE
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.
Tel886-3-5645656 Fax886-3-5645626






DM621 Datasheet, Funktion
DM621
Maximum Ratings (Ta = 25°C, Tj(max) = 150°C)
CHARACTERISTIC
Supply Voltage
Input Voltage
Output Current
Output Voltage
DCK Frequency
IGND Terminal Current
Power Dissipation
Thermal Resistance
Operating Temperature
Storage Temperature
SYMBOL
VDD
VIN
IOUT
VOUT
FDCK
IGND
PD
Rth(j-a)
Topr
Tstg
RATING
12
5
90
28
20
750
3.1 (QFN20: Ta=25°C)
2.78 ( TSSOP24 exposed pad: Ta=25°C)
40.21 (QFN20)
45 (TSSOP24 exposed pad)
85
150
UNIT
V
V
mA
V
MHz
mA
W
°C/W
°C
°C
Recommended Operating Condition
CHARACTERISTIC
Supply Voltage
Output Voltage
Operating Temperature
Output Current
Input Voltage
SYMBOL
VDD
VOUT
TOPR
IOUT
IOH
IOL
VIH
VIL
CONDITION
OUT
VOH =3V
VOL= 0.2V
VDD=5V~12V
MIN.
5
25
5
3
0
TYP. MAX. UNIT
12 V
28 V
85
90 mA
2.5 mA
-2 mA
5
V
1
12-Channels Pre-programmable Constant Current LED Driver Version:A.006
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 5

6 Page









DM621 pdf, datenblatt
Command/Data Switching and Auto-latch Function
DM621
Figure 9(a). The Command/Data Method
Figure 9(b). The Auto-latch Method
DM621 combines the signals of DCK and SIN to realize the Command/Data switching
and Auto-latch function. When the area that DCK keeps at high level includes two
positive edges of SIN, DM621 would switch automatically to the command data mode,
illustrated in Figure 9(a). At this time, 8-bits command data could be transmitted to set
the operating condition adequate for different applications. After command data
transmission is accomplished, a latch signal would have to be executed by Auto-latch
function. And this chip would latch command data into internal registers and return to the
grayscale data mode as a latch instruction is executed. The Auto-latch function is
realized by this method that the area that DCK keeps at high level includes only one
positive edge of SIN, illustrated in Figure 9(b). Note that the latch signal of command
data and grayscale data could be completed according to the same Auto-latch process.
Both Command/Data switching and Auto-latch process would produce signals to control
synchronously every serial DM621s. Therefore, each serial DM621 would enter the
command mode and execute a latch instruction simultaneously. And DM621 also
supports the internal synchronous clock for grayscale display. These characteristics
would make great grayscale display possible. In this specific design, the smallest
limitation of tCMD, the time from the positive edge of DCK to the first positive edge of SIN,
is 20ns in order to promise the correct command and grayscale data could be received.
Note that command data have to be transmitted to pre-programmed DM621s when the
system is restarted because there are no EEPROM in this chip to save the command data
and the grayscale data.
12-Channels Pre-programmable Constant Current LED Driver Version:A.006
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.
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SeitenGesamt 22 Seiten
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