Application information STLED325
10.1 Power supply sequencing
Proper power-supply sequencing is advised for all CMOS devices. It is recommended to always apply V
CC
before applying any signals to the input/output or control pins.
10.2 I
SET
variation with R
SET
The graph of I
SET
variation with R
SET
is shown in Figure 21 .
Figure 21.
Rext versus Iseg curve
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STLED325 Application information
Figure 22.
Application schematic
C 1 C 2
G ND
M ain CPU
IR rem ote control sensor
R 3 R 2
Creg
R1
VBAT
W AKE_UP
IRQ _N
STBY
READY
SCL
SDA
M UTE
VCC
DIG 5
DIG 1-DIG 4
STLED 325
IR _IN
XI
XO
ISET
SEG 1/KS 1
-SEG 8/KS8
RSET
G ND KEY1-KEY 2
4
D 1 D 2 D 3 D 4 D 5 D 6 D 7 D 8
LE D 4 -D igit 7 s egm ent
(+ dot
-point)
D i s pl a y p a nel
W ith s om e individ ua l LE D s
CL1
Crystal
(32.768KHz)
CL2
R4
R 5 Keyscan
(8x2 m atrix)
G ND
AM0 8 725V1
Resistors:
RSET = external resistor for current setting
R1 = 1-10 KO SDA external pull-up resistor
R2 = 1-10 KO SCL external pull-up resistor
R3 = 1-10 KO IRQ_N external pull-up resistor
R4-R5 = 10 KO external key-matrix pull-down resistors
Capacitors:
C1 = 33 µF (25 V) electrolytic
C2 = 0.01-0.1µF (25V) ceramic
Creg=0.1 uF
CL1 = CL2 = 25pF
Diodes
D1-D8 = 1N4148
Supply voltage
V
CC
= 5 V ± 10%
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Package mechanical data
11 Package mechanical data
STLED325
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK
® specifications, grade definitions and product status are available at: www.st.com
. ECOPACK is an ST trademark.
Table 31.
QFN32 (5 x 5 mm) mechanical data
Symbol
A
A1
A3 b
D
D2
E
E2 e
L ddd
Min
0.80
0
0.18
4.85
3.35
4.85
3.35
0.30
Millimeters
Typ
3.45
5.00
3.45
0.50
0.40
0.90
0.02
0.20
0.25
5.00
Max
1.00
0.05
0.30
5.15
3.55
5.15
3.55
0.50
0.08
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STLED325
Figure 23.
QFN32 package dimensions
Package mechanical data
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Package mechanical data
Figure 24.
QFN32 carrier tape
STLED325
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STLED325
Table 32.
Document revision history
Date Revision
27-Apr-2011 1 Initial release.
Changes
Revision history
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STLED325
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