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| 型号： | HCMS-3902 |
| 英文描述： | 3.3 V High Performance CMOS 5x7 AlphaNumeric Displays |
| 中文描述： | 3.3伏高性能CMOS 5x7字母数字显示器 |
| 文件页数： | 19/22页 |
| 文件大小： | 123K |
| 代理商： | HCMS-3902 |
19
Appendix B. Electrical
Considerations
Current Calculations
The peak and average display
current requirements have a
significant impact on power
supply selection. The maximum
peak current is calculated with
Equation 3 in Table 3.
The average current required by
the display can be calculated with
Equation 4 in Table 3.
The power supply has to be able
to supply I
PEAK
transients and
supply I
LED
(AVG) continuously.
The range on V
LED
allows noise
on this supply without signifi-
cantly changing the display
brightness.
Table 3. Equations.
Equation 1:
T
J
MAX = T
A
+ P
D
* R
θ
JA
Where: T
J
MAX = maximum IC junction temperature
T
A
= ambient temperature surrounding the display
R
θ
JA
= thermal resistance from the IC junction to ambient
P
D
= total power dissipation
Equation 2:
P
D
= (N * I
PIXEL
* Duty Factor * V
LED
) + I
LOGIC
* V
LOGIC
Where:
P
D
= total power dissipation
N = number of pixels on (maximum 4 char * 5 * 7 = 140)
I
PIXEL
= peak pixel current.
Duty Factor = 1/8 * Osccyc/64
Osc cyc = number of ON oscillator cycles per row
I
LOGIC
= IC logic current
V
LOGIC
= logic supply voltage
Equation 3:
I
PEAK
= M * 20 * I
PIXEL
Where:
I
PEAK
= maximum instantaneous peak current for the display
M = number of ICs in the system
20 = maximum number of LEDs on per IC
I
PIXEL
= peak current for one LED
Equation 4:
I
LED
(AVG) = N * I
PIXEL
* 1/8 * (oscillator cycles)/64
(See Variable Definitions above)
V
LOGIC
and V
LED
Considerations
The display uses two independent
electrical systems. One system is
used to power the display’s logic
and the other to power the
display’s LEDs. These two
systems keep the logic supply
clean.
Separate electrical systems allow
the voltage applied to V
LED
and
V
LOGIC
to be varied in-
dependently. Thus, V
LED
can vary
from 0 to 5.5 V without affecting
either the Dot or the Control
Registers. V
LED
can be varied
between 3.1 to 5.5 V without
much noticeable variation in light
output to the human eyes. There
is also no pixel mismatch
observed.
The intensity of the light output
takes a plunge if operated less
than 3.1 V. There is also no pixel
mismatch observed at voltage as
low as 2.6 V. However, operating
below 3.1 V is not recommended.
Dimming the display by pulse
width modulating V
LED
is also not
recommended.
V
LOGIC
can vary from 3.0 to 5.5 V
without affecting either the
displayed message or the display
intensity. However, operating
below 3 V may change the timing
and logic levels and may cause
Dot and Control Registers to be
altered. Thus, operation of the
display below 3.0 V is not
recommended.
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