Rev. 1.40
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Rev. 1.40
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BS67F340/BS67F350/BS67F360/BS67F370
Enhanced Touch A/D Flash MCU with LCD Driver
BS67F340/BS67F350/BS67F360/BS67F370
Enhanced Touch A/D Flash MCU with LCD Driver
LCD Driver
For large volume applications, which incorporate an LCD in their design, the use of a custom
display rather than a more expensive character based display reduces costs significantly. However,
the corresponding COM and SEG signals required, which vary in both amplitude and time, to drive
such a custom display require many special considerations for proper LCD operation to occur.
These devices all contain an LCD Driver function, which with their internal LCD signal generating
circuitry and various options, will automatically generate these time and amplitude varying signals
to provide a means of direct driving and easy interfacing to a range of custom LCDs.
Device
Duty
Bias
Bias Type
Wave Type
BS�7F340
BS�7F3�0
BS�7F3�0
BS�7F370
1/4
1/3
R o� C
A o� B
LCD Selections
Note: The pin VMAX must be connected to the maximum voltage to prevent from the pad leakage.
Powe� Supply f�o� pin V�
Cha�ge
Pu�p
VA=V1=3*V
IN
VB=PLCD=�*V
IN
VC=V�=V
IN
0.1uF
0.1uF
0.1uF
C1
C�
V1
V�
VMAX
PLCD
V
IN
V
DD
o� V1
Cha�ge
Pu�p
VA=V1=V
IN
VB=PLCD=2/3*V
IN
VC=V2=1/3*V
IN
0.1uF
0.1uF
0.1uF
C1
C�
V1
V�
VMAX
PLCD
Powe� Supply f�o� pin V1
V
IN
V
DD
o� V1
Cha�ge
Pu�p
VA=V1=3/2*V
IN
VB=PLCD=V
IN
VC=V2=1/2*V
IN
0.1uF
0.1uF
0.1uF
C1
C�
V1
V�
VMAX
PLCD
V
IN
Powe� Supply f�o� pin PLCD
V
DD
o� V1
C Type Bias External Power Supply Configuration – 1/3 Bias
Note: The pin VMAX must be connected to the maximum voltage to prevent from the pad leakage.
Powe� Supply f�o� VA
Cha�ge
Pu�p
VA=V1=V
IN
0.1uF
0.1uF
C1
C�
V1
V�
VMAX
PLCD
V1
0.1uF
V
DD
V
IN
VB=PLCD=2/3*V
IN
VC=V2=1/3*V
IN
0.1uF
Cha�ge
Pu�p
0.1uF
0.1uF
C1
C�
V1
V�
VMAX
PLCD
Powe� Supply f�o� VB
V1
VA=V1=3/2*V
IN
V
DD
V
IN
VB=PLCD=V
IN
VC=V2=1/2*V
IN
0.1uF
0.1uF
Powe� Supply f�o� VC
Cha�ge
Pu�p
0.1uF
0.1uF
C1
C�
V1
V�
VMAX
PLCD
V
DD
o� V1
VA=V1=3*V
IN
V
REFIN
V
IN
VB=PLCD=�*V
IN
VC=V�=V
IN
0.1uF
0.1uF
C Type Bias Internal Power Supply Configuration – 1/3 Bias