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STE2004 Datasheet(PDF) 7 Page - STMicroelectronics

Part # STE2004
Description  102 X 65 SINGLE CHIP LCD CONTROLLER / DRIVER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STE2004 Datasheet(HTML) 7 Page - STMicroelectronics

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STE2004
Figure 4. Master Slave Logic Connection with frame Synchronization
Figure 5. Master Slave Logic Connection without frame Synchronization
3.5 Bias Levels
To properly drive the LCD, six (Including VLCD and VSS) different voltage (Bias) levels are generated.
The ratios among these levels and VLCD, should be selected according to the MUX ratio (m). They are
established to be (Fig. 6):
Figure 6. Bias level Generator
thus providing an 1/(n+4) ratio, with n calculated from:
For m = 65, n = 5 and an 1/9 ratio is set.
For m = 49, n =4 and an 1/8 ratio is set.
The STE2004 provides three bits (BS0, BS1, BS2) for programming the desired Bias Ratio as shown below:
OSCOUT
LR0219
STE2004
VDD1AUX
STE2004
FROUT
OSCIN
FRIN
OSCIN FRIN
OSCOUT
FROUT
OSCOUT
LR0220
STE2004
VDD1AUX
STE2004
FROUT
OSCIN FRIN
OSCOUT
FROUT
VDD1AUX
OSCIN
FRIN
V
LCD
n3
+
n4
+
------------- V
LCD ,
n2
+
n4
+
------------- V
LCD ,
2
n4
+
------------- V
LCD ,
1
n4
+
------------- V
LCD ,VSS
,
R
VLCD
VSS
·VLCD
·VLCD
·VLCD
·VLCD
n + 3
n + 4
R
nR
R
R
n + 2
n + 4
2
n + 4
1
n + 4
D00IN1150
nm
3
–
=


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