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参数资料
| 型号： | SCE5785 |
| 厂商： | SIEMENS A G |
| 元件分类： | 显示用LED |
| 英文描述： | 5X7 DOT MATRIX DISPLAY, SOFT ORANGE, 4.57 mm |
| 封装： | PLASTIC, DIP-26 |
| 文件页数： | 13/13页 |
| 文件大小： | 295K |
| 代理商： | SCE5785 |
2–195
SCE5780/1/2/3/4/5
The SCE578X allows a high frequency external oscillator
source to drive the display. Data bit, D4, in the control word
format controls the prescaler function. The prescaler allows
the oscillator source to be divided by 16 by setting D4=1.
However, the prescaler should not be used, i.e., when using
the internal oscillator source.
The Software Clear (C0HEX ), given in Table 6, clears the
Address Register and the RAM. The display is blanked and
the Character Address Register will be set to Character 0.
The internal counter and the Control Word Register are unaf-
fected. The Software Clear will remain active until the next
data input cycle is initiated.
Table 6. Software Clear
Multiplexer and Display Driver
The eight characters are row multiplexed with RAM resident
column data. The strobe rate is established by the internal or
external MUX Clock rate. The MUX Clock frequency is
divided by a 320 counter chain. This results in a typical
strobe rate of 768 Hz. By pulling the Clock SEL line low, the
display can be operated from an external MUX Clock. The
external clock is attached to the CLK I/O connection.
An asynchronous hardware Reset (pin 8) is also provided.
Bringing this pin low will clear the Character Address Regis-
ter, Control Word Register, RAM, and blanks the display. This
action leaves the display set at Character Address 0, and the
Brightness Level set at 100%, prescaler
÷1.
ELECTRICAL & MECHANICAL CONSIDERATIONS
Thermal Considerations
The display’s power usage may need to be reduced to oper-
ate at high ambient temperatures. The power may be
reduced by lowering the brightness level. reducing the total
number of LEDs illuminated, or lowering VLED. The VCC sup-
ply, relative to the VLED supply, has little effect on the power
dissipation of the display and is not considered when deter-
mining the power dissipation.
Tot determine the power deration with a given ambient tem-
perature, use the following formula:
Tjmax=TA + PD θja
Op code
D7 D6
Control Word
D5
D4
D3
D2
D1
D0
Hex
Operation
1
0
C0
CLEAR
where: Tjmax=maximum IC junction temperature
PD=power dissipated by the ICs
θja=thermal resistance, junction to ambient
To determine the power dissipation of the display, use the fol-
lowing formula:
PD=N ILL/140 RB
where: N=number of LEDs on
ILL/140=average current for a single LED
RB=relative brightness level
A typical thermal resistance vaule (
θ
ja) for this display is
50
°c/W when mounted in a socket soldered ona 0.062” thick
PCB with 0.020”, 1 ounce copper traces and the display cov-
ered by a plastic lter. The display’s maximum IC junction
temperature is 125
°C. Paragraph 6.2.5, Power Deration
Curve is based on these typical values.
Figure 10. Power Deration Curve (
θja=50°C/W)
VCC and VLL are two separate power supplies sharing a com-
mon ground. VCC supplies power for all the display logic. VLL
supplies the power for the LEDs. By separating the two sup-
plies, VCCand VLL can be varied independently and keeps
the logic supply clean.
VLL can be varied between 3 volts and 5.5 volts. The LED
drive current will vary with changes in VLL. See Figure 11 for
ILL variance.
VCC can vary between 3 volts and 5.5 volts. Operation below
4.5 volts will change the timing and switching levels of the
inputs. Using 25% x VCC for VIL and 75% of VCC for VIH will
work down to a VCC level of 3 volts.
Temperature
Watts
0.0
0.5
1.0
1.5
2.0
2.5
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90 100
Figure 9. Row Strobing
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
ROW LOAD
LOAD ROW 0
LOAD ROW 1
LOAD ROW 2
LOAD ROW 3
LOAD ROW 4
LOAD ROW 5
LOAD ROW 6
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
Row 0
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
0 1 2 3 4
Columns
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