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AN1447 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN1447
Description  SOFTWARE DRIVER FOR 4-MULTIPLEXED LCD WITH A STANDARD ST62
PDF  26 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1447 Datasheet(HTML) 6 Page - STMicroelectronics

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4-MULTIPLEXED LCD WITH A STANDARD ST62
Figure 5. LCD signals for 4-multiplexed mode (used in library)
t
t
t
COM0
S
t
COM1
t
COM2
t
COM3
ϕ
0
ϕ
1
ϕ
2
ϕ
3
ϕ
4
ϕ
5
ϕ6 ϕ
7
ϕ
0
ϕ
1
ϕ
2
ϕ
3
ϕ
4
ϕ
5
ϕ6 ϕ
7
S∆0
t
S∆1
t
S∆2
t
S∆3
= COM0 - S
(S∆0)RMS = (√3/4).Vdd ⇒ S0 OFF
(S∆1)RMS = (√3/4).Vdd ⇒ S1 OFF
(S∆2)RMS = (√3/4).Vdd ⇒ S2 OFF
(S∆3)RMS = (√3/4).Vdd ⇒ S3 OFF
(S∆0)RMS = (√3/4).Vdd ⇒ S0 OFF
(S∆2)RMS = (√3/4).Vdd ⇒ S2 OFF
(S∆1)RMS = (√7/4).Vdd ⇒ S1 ON
(S∆3)RMS = (√7/4).Vdd ⇒ S3 ON
Vdd
0
Vdd
0
Vdd
0
Vdd
0
Vdd
0
Vdd
0
-Vdd
Vdd
0
-Vdd
Vdd
0
-Vdd
Vdd
0
-Vdd



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