Lcd Driver - Holtek HT67F2350 Manual

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. This
device contains 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.
The device includes a wide range of options to enable LCD displays of various types to be driven.
The table shows the range of options available for the device range.
Device No.
HT67F2350
HT67F2360
HT67F2370
HT67F2390
0.1uF
V1
Charge
VA=V1=3/2*V
IN 0.1uF
Pump
VB=PLCD=V
IN
VC=V2=1/2*V
V2
IN
0.1uF
Power Supply from pin PLCD
Note: The pin VMAX must be connected to the maximum voltage to prevent from the pad current leakage.
C Type Bias External Power Supply Configuration – 1/3 Bias
0.1uF
0.1uF
V1
V VA=V1=V
IN IN
V
Charge
DD
0.1uF
Pump
VB=PLCD=2/3*V
IN
VC=V2=1/3*V
IN
V2
0.1uF
Power Supply from VA
Note: The pin VMAX must be connected to the maximum voltage to prevent from the pad current leakage.
C Type Bias Internal Power Supply Configuration – 1/3 Bias
Rev. 1.60
Advanced A/D Flash MCU with LCD & EEPROM
Duty Bias
1/4 1/3
1/6 1/3
1/8 1/3
1/8 1/4
LCD Selection
V or V1
DD
V
IN
V1
Charge
VA=V1=V
IN
Pump
VB=PLCD=2/3*V
IN
VC=V2=1/3*V
V2
IN
Power Supply from pin V1
V1
VA=V1=3/2*V
IN
Charge
Pump
V
VB=PLCD=V
IN IN
V
DD
VC=V2=1/2*V
IN
Power Supply from VB
222
HT67F2350/HT67F2360
HT67F2370/HT67F2390
Bias Type
R or C
R or C
R
R
V or V1
DD
0.1uF
0.1uF
V
IN
VA=V1=3*V
Charge
IN
Pump
VB=PLCD=2*V
IN
VC=V2=V
IN
0.1uF
Power Supply from pin V2
V1
0.1uF
0.1uF
V1
VA=V1=3*V
IN
0.1uF
VB=PLCD=2*V
IN
V
VC=V2=V
V2 IN IN
V
REFIN
0.1uF
Power Supply from VC
Wave Type
A or B
A or B
A or B
A or B
V or V1
DD
0.1uF
0.1uF
V1
0.1uF
V2
V
IN
V or V1
DD
0.1uF
0.1uF
V1
Charge
0.1uF
Pump
V2
0.1uF
May 16, 2019