HCMS-39X2 Datasheet, PDF (15/22 Pages) Agilent(Hewlett-Packard) – 3.3 V High Performance CMOS 5x7 AlphaNumeric Displays

Table 2. Control Shift Register.
CONTROL WORD 0
L
D₆
↑
Bit D₇
Set Low
to Select
Control
Word 0
D₅
D₄
D₃
D₂
D₁
D₀
PWM Brightness Control
LL L L
LL L H
LL H L
LL HH
LH L L
LH L H
LH H L
LH H H
HL L L
HL L H
HL H L
HL H H
HH L L
HH L H
HH H L
HH H H
On-Time
Oscillator
Cycles
0
1
2
3
4
5
7
9
11
14
18
22
28
36
48
60
Duty
Factor
(%)
0
0.2
0.4
0.6
0.8
1.0
1.4
1.8
2.1
2.7
3.5
4.3
5.5
7.0
9.4
11.7
Relative
Brightness
(%)
0
1.7
3.3
5.0
6.7
8.3
11.7
15
18
23
30
37
47
60
80
100
Peak Current
Brightness
Control
HL
LH
LL
HH
Typical Peak
Pixel Current
(mA)
4.0
6.4
9.3
12.8
Relative Full
Scale Current
(Relative Brightness, %)
31
50
73 (Default at Power Up)
100
SLEEP MODE
L – DISABLES INTERNAL OSCILLATOR-DISPLAY BLANK
H – NORMAL OPERATION
H
L
↑
Bit D₇
Set High
to Select
Control
Word 1
CONTROL WORD 1
L
L
L
L
Reserved for Future
Use (Bits D₂-D₆ must
be set Low)
D₁
D₀
Serial/Simultaneous Data Out
L – D_OUT holds contents of Bit D₇
H – D_OUT is functionally tied to D_in
External Display Oscillator
Prescaler
L – Oscillator Freq ÷ 1
H – Oscillator Freq ÷ 8
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