tl0324s Newhaven Display International, Inc, tl0324s Datasheet - Page 20

• Manufacturer Part Number: tl0324s
• Description: 65com / 132seg Driver & Controller For Stn Lcd
• Manufacturer: Newhaven Display International, Inc

b. Voltage regulator circuits
The function of the internal voltage regulator circuits is to determine liquid crystal operating voltage, V0, by
the adjusting resistors, Ra and Rb, within the range of |V0| < |
Because
necessary to be applied internally or externally.
For the equation 1, we determine V0 by Ra, Rb and V
by INTRS pin.
The voltage of electronic volume, V
parameter α is the value selected by instruction, "Set reference voltage register", within the range 0 to 63.
Refer to table 5-8.
VREF voltage at Ta =25°C is show in table 5-7.
Table 5-7. VREF voltage at Ta =25°C
Table 5-8. Electronic contrast control register (Reference Voltage Parameter: α, 64step)
TOMATO LSI Inc.
SV5
0
0
1
1
1
:
:
:
:
TL0324S
V
OUT
SV4
0
0
0
1
1
:
:
:
:
is the operating voltage of operational-amplifier circuits as shown in figure 5-13, it is
SV3
REF
0
0
0
1
1
:
:
:
:
H
L
V
SV2
EV
V0 = ( 1 +
0
0
0
1
1
:
:
:
:
= ( 1 -
EV,
is determined by equation 2, where the reference voltage
SV1
0
0
0
1
1
:
:
:
:
( 63-α )
Rb
Ra
Temp. coefficient
162
External input
-0.05% / °C
SV0
) x V
0
1
0
0
1
:
:
:
:
) x VREF [V] ------ (Equation 2)
20
65COM / 132SEG DRIVER & CONTROLLER FOR STN LCD
EV
EV
. Ra and Rb are connected internally or externally
Reference Voltage
[V] ------ (Equation 1)
Parameter ( α)
32 (default)
V
OUT
62
63
0
1
|.
:
:
:
:
V
VEXT
REF
Maximum
2.1
Minimum
[V]
V0
:
:
:
:
:
:
:
:
:
:
:
Contrast
High
Low
:
:
:
:
:
:
:
:
:
:
:
Ver 0.1