HCMS-3977 Avago Technologies US Inc., HCMS-3977 Datasheet - Page 21

• Manufacturer Part Number: HCMS-3977
• Description: LED DISPLAY 5X7 8CHAR 5MM GRN
• Manufacturer: Avago Technologies US Inc.
• Series: HCMS-39xxr

Specifications of HCMS-3977

• Display Type: Alphanumeric
• Millicandela Rating: *
• Internal Connection: *
• Size / Dimension: *
• Color: Green
• Configuration: *
• Voltage - Forward (vf) Typ: *
• Package / Case: 26-DIP
• Number Of Digits/alpha: 8
• Digit/alpha Size: 0.20" (5mm)
• Number Of Digits: 8
• Character Size: 2.54 mm x 4.57 mm
• Illumination Color: Green
• Wavelength: 574 nm
• Operating Voltage: 3.3 V
• Operating Current: 10 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Luminous Intensity: 1000 ucd
• Power Consumption: 1.532 W
• Viewing Area (w X H): 40.06 mm x 4.57 mm
• Common Pin: None
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Appendix E. Display
Brightness
Two ways have been shown to
control the brightness of this
LED display: setting the peak
current and setting the duty
factor. Both values are set in
Control Word 0. To compute the
resulting display brightness when
both PWM and peak current
control are used, simply multiply
the two relative brightness
factors. For example, if Control
Register 0 holds the word
Figure 10. Relative luminous Intensity versus ambient temperature.
3.0
2.5
2.0
1.5
1.0
0.5
0
-50
AMBIENT TEMPERATURE – °C
0
50
GREEN
RED
1001101, the peak current is
73% of full scale (BIT D
D
60% duty factor (BIT D
BIT D2 = H, BIT D
= H). The resulting brightness is
44% (.73 x .60 = .44) of full
scale.
The temperature of the display
will also affect the LED
brightness as shown in Figure 10.
4
= L) and the PWM is set to
100
1
= L, BIT D
3
5
=L, BIT
= H,
0
Appendix F. Reference
Material
Application Note 1027:
Soldering LED Components
Application Note 1015: Contrast
Enhancement Techniques for
LED Displays