HDLA-3416 datasheet(10/12 Pages) AVAGO

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Table 1. Current Requirements at Different Brightness Levels

Symbol

Brightness

25°C Typ.

25°C Max.

Max. over Temp.

Units

IDD(#)

100%

110

130

160

60%

40%

27%

17%

10%

Figure 3. Display blanking truth table.

Figure 3 shows how the Extended Function Disable (bit D6

of the Control Register), Master Blank (bit D2 of the Control

and BL input can be used to blank the display.

When the Extended Function Disable is a logic 1, the

display can be blanked only with the BL input. When

the Extended Function Disable is a logic 0, the display

can be blanked through the BL input, the Master

Blank, and the Digit Blank Disable. The entire display

will be blanked if either the BL input is logic 0 or the

Master Blank is logic 1, providing all Digit Blank Disable

bits

are

logic

0. Those

digits

with

Digit

Blank

Disable bits a logic 1 will ignore both blank signals

and remain ON. The Digit Blank Disable bits allow individ-

ual characters to be blanked or flashed in synchronization

with the BL input.

Dimming

Dimming of the display is controlled through either the

BL input or the Control Register. A pulse width modulated

signal can be applied to the BL input to dim the display.

A three bit word in the Control Register generates an

internal pulse width modulated signal to dim the display.

The internal dimming feature is enabled only if the

Extended Function Disable is a logic 0.

Bits 3–5 in the Control Register provide internal brightness

control. These bits are inter-preted as a three bit binary

code, with code (000) corresponding to the maximum

brightness and code (111) to the minimum brightness. In

addition to varying the display brightness, bits 3–5 also

vary the average value of IDD. IDD can be specified at any

brightness level as shown in Table 1.

– Display Blanked by BL

– Display ON

– Display Blanked by BL.

Individual Characters “ON”

based on “1” being stored in DBDn

– Display Blanked by MB

– Display Blanked by MB.

Individual characters “ON”

based on “1” being stored in DBDn

– Display Blanked by BL

– Display ON

EFD

DBDn

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