ST2225A
Version :
A.025
Issue Date :
2001/11/26
File Name :
SP-ST2225A-A.025.doc
Total Pages
:
12
LED Display 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
ST2225A
SILICON TOUCH TECHNOLOGY INC.
LED Display Driver
-1-
VersionA.025
ST2225A
LED Display Driver
General Description
The ST2225A LED display driver is a monolithic CMOS IC. In order to achieve
continuous brightness control, the LED display brightness is controlled by setting a reference
current through a variable resistor connected between a supply and a single pin.
Features
n"
Continuous brightness control
n"
Serial data input
n"
No load signal required for data latch
n"
Wide power supply operation
n"
TTL compatibility
n"
35 outputs, 20mA capability
n"
Small package, SSOP48 and bare chip form
Applications
n"
Industrial control indicator
n"
Relay driver
n"
Digital clock, thermometer, counter, voltmeter
n"
Instrumentation readouts
Ordering Information
Part Number
Temp. Range
Package
ST2225A-SS3
-40 to +85 SSOP48
ST2225A-D
-40 to +85 Bare
Chip
ST2225A
SILICON TOUCH TECHNOLOGY INC.
LED Display Driver
-2-
VersionA.025
Block Diagram
Connection Diagram : SSOP48 Package
35 OUTPUT BUFFERS
35 LATCHES
35-BIT SHIFT
REGISTERS
RESET
RESET
LOAD
OUT1
OUT35
BRIGHTNESS
CONTROL
VDD
22 30
19
21
1,13,36
29
28
27
DATA ENABLE
SERIAL DATA
CLOCK
Figure 1
20
Figure 2
2
3
4
5
6
1
8
9
10
11
12
7
14
15
16
17
18
19
20
21
22
13
23
24
47
46
45
44
43
48
41
40
39
38
37
42
35
34
33
32
31
30
29
28
27
36
26
25
OUTPUT BIT18
OUTPUT BIT19
OUTPUT BIT20
OUTPUT BIT21
OUTPUT BIT22
OUTPUT BIT23
OUTPUT BIT24
OUTPUT BIT25
OUTPUT BIT26
OUTPUT BIT27
OUTPUT BIT28
OUTPUT BIT29
VSS
OUTPUT BIT30
OUTPUT BIT31
OUTPUT BIT32
OUTPUT BIT33
OUTPUT BIT34
OUTPUT BIT35
DATA ENABLE
DATA
CLOCK
N/A
N/A
VSS
OUTPUT BIT17
OUTPUT BIT16
OUTPUT BIT15
OUTPUT BIT14
OUTPUT BIT13
OUTPUT BIT12
OUTPUT BIT11
OUTPUT BIT10
OUTPUT BIT 9
OUTPUT BIT 8
OUTPUT BIT 7
VSS
OUTPUT BIT 6
OUTPUT BIT 5
OUTPUT BIT 4
OUTPUT BIT3
OUTPUT BIT 2
OUTPUT BIT 1
RESET
BRIGHTNESS CONTROL
VDD
N/A
N/A
ST2225A-SS3
ST2225A
SILICON TOUCH TECHNOLOGY INC.
LED Display Driver
-3-
VersionA.025
Die Configuration
* Note: SiTI reserves the right to improve the device geometry and
manufacturing processes without prior notice. Though these improvements
may result in slight geometry changes, they will not affect die electrical
characteristics and pad layouts.
Wafer Information
Material Silicon with P-Substrate
Diameter 6 inches(15cm)
Thickness 12 mils(300um)
Width of scribe line100um
Malfunctioned dieMarked with red ink or equivalent marking
Die Size: 1449.6um * 2614um
Pad Size: 100um * 100um
ST2225A-D
Figure 3
BR
I
GHTNES
S
C
ONTR
O
L
OUTPUT BIT 23
OUTPUT BIT 13
OUTPUT B
I
T 14
RESET
VDD
CL
K
DA
T
A
DA
T
A
ENABL
E
OUTPUT BIT 24
OUTPUT BIT 25
OUTPUT BIT 26
OUTPUT BIT 27
OUTPUT BIT 28
OUTPUT BIT 29
VSS
OUTPUT BIT 30
OUTPUT BIT 31
OUTPUT BIT 32
OUTPUT BIT 33
OUTPUT BIT 34
OUTPUT BIT 35
OUTPUT BIT 12
OUTPUT BIT 11
OUTPUT BIT 10
OUTPUT BIT 9
OUTPUT BIT 8
OUTPUT BIT 7
VSS
OUTPUT BIT 6
OUTPUT BIT 5
OUTPUT BIT 4
OUTPUT BIT 3
OUTPUT BIT 2
OUTPUT BIT 1
OUTPUT B
I
T 15
OUTPUT B
I
T 16
OUTPUT B
I
T 17
V
SS
OUTPUT B
I
T 18
OUTPUT B
I
T 19
OUTPUT B
I
T 20
OUTPUT B
I
T 21
OUTPUT B
I
T 22
(0, 0)
ST2225A
SILICON TOUCH TECHNOLOGY INC.
LED Display Driver
-4-
VersionA.025
Pad Allocation for the Bare Chip, ST2225A-D
PAD Name
Center Coordinate
(X,Y) um
PAD Name
Center Coordinate
(X,Y) um
VSS 666.2 2574.7 CLK 744 109.7
OUTPUT17
526.2 2574.7 DATA 1033.2 109.7
OUTPUT16
381.2 2574.7
DATAENZ
1322.4 109.7
OUTPUT15 236.2 2574.7 OUTPUT35
1375.9 295.2
OUTPUT14 91.2
2574.7 OUTPUT34 1375.9
445.2
OUTPUT13
100.1 2225.2
OUTPUT33
1375.9 595.2
OUTPUT12
100.1 2075.2
OUTPUT32
1375.9 745.2
OUTPUT11
100.1 1925.2
OUTPUT31
1375.9 895.2
OUTPUT10 100.1 1775.2 OUTPUT30 1375.9
1045.2
OUTPUT9 100.1 1625.2
VSS 1375.9 1185.2
OUTPUT8 100.1 1475.2 OUTPUT29 1375.9 1325.2
OUTPUT7 100.1 1325.2 OUTPUT28 1375.9 1475.2
VSS 100.1 1185.2
OUTPUT27
1375.9
1625.2
OUTPUT6 100.1 1045.2
OUTPUT26 1375.9
1775.2
OUTPUT5 100.1
895.2 OUTPUT25 1375.9 1925.2
OUTPUT4 100.1 745.2 OUTPUT24 1375.9 2075.2
OUTPUT3 100.1 595.2 OUTPUT23 1375.9 2225.2
OUTPUT2 100.1 446.6 OUTPUT22 1375.9 2574.7
OUTPUT1 100.1 306.6 OUTPUT21 1241.2
2574.7
RESET 168.6 109.7
OUTPUT20 1096.1 2574.7
IBRIGHT 385.7 109.7 OUTPUT19 951.2 2574.7
VDD 520.7 109.7
OUTPUT18
806.2 2574.7
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