HCMS-3907 datasheet(21/22 Pages) HP

Part #	HCMS-3907

Description	3.3 V High Performance CMOS 5x7 AlphaNumeric Displays

PDF	22 Pages

Scroll/Zoom	100%

Manufacturer	HP [Agilent(Hewlett-Packard)]

Direct Link	http://www.home.agilent.com

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21 / 22 page

Appendix F. Reference

Material

Application Note 1027:

Soldering LED Components

Application Note 1015: Contrast

Enhancement Techniques for

LED Displays

Figure 10. Relative luminous Intensity versus ambient temperature.

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

1001101, the peak current is

73% of full scale (BIT D5=L, BIT

D4 = L) and the PWM is set to

60% duty factor (BIT D3 = H,

BIT D2 = H, BIT D1 = L, BIT D0

= 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.

-50

AMBIENT TEMPERATURE – °C

3.0

2.5

2.0

1.5

1.0

0.5

100

RED

GREEN

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