HDLX-3461 HP [Agilent(Hewlett-Packard)], HDLX-3461 Datasheet - Page 10

• Manufacturer Part Number: HDLX-3461
• Description: Four Character 6.9 mm (0.27 inch) Smart 5 x 7 Alphanumeric Displays
• Manufacturer: HP [Agilent(Hewlett-Packard)]

strobing the blank input). All of
these blanking modes affect only
the output drivers, maintaining
the contents and write capability
of the internal RAMs and Control
Register, so that normal loading
of RAMs and Control Register can
take place even with the display
blanked.
Figure 3 shows how the Extended
Function Disable (bit D
Control Register), Master Blank
(bit D
Digit Blank Disable (bit D
Attribute RAM), 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, pro-
viding 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 individual
characters to be blanked or
flashed in synchronization with
the BL input.
Table 1. Current Requirements at Different Brightness Levels
Symbol D
I
DD
(#)
2
of the Control Register),
0
0
0
0
1
1
1
1
5
D
0
0
1
1
0
0
1
1
4
D
0
1
0
1
0
1
0
1
3
6
of the
1
Brightness
of the
100%
60%
40%
27%
17%
10%
7%
3%
Figure 3. Display Blanking Truth Table.
Dimming
Dimming of the display is con-
trolled 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.
EFD
0
0
0
0
0
1
1
25 C Typ.
MB
X
X
X
0
0
1
1
110
66
45
30
20
12
9
4
DBD n
X
X
X
0
1
0
1
BL
25 C Max.
X
0
1
0
1
0
1
130
79
53
37
24
15
11
6
–Display Blanked by BL
–Display ON
–Display Blanked by BL.
–Display Blanked by MB
–Display Blanked by MB.
–Display Blanked by BL
–Display ON
10
Bits 3–5 in the Control Register
provide internal brightness
control. These bits are interpreted
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 I
specified at any brightness level
as shown in Table 1.
Individual Characters “ON”
based on “1” being stored in DBD n
Individual characters “ON”
based on “1” being stored in DBD n
Max. over Temp. Units
160
98
66
46
31
20
15
9
DD
. I
DD
can be
mA
mA
mA
mA
mA
mA
mA
mA