ra8816 RAIO Technology Inc., ra8816 Datasheet - Page 37

• Manufacturer Part Number: ra8816
• Description: 144x65 Character/graphic Lcd Driver
• Manufacturer: RAIO Technology Inc.

Preliminary Version 1.6
RAiO TECHNOLOGY INC.
6-4-2 Voltage Regulator
The Voltage Regulator is consists of Band-Gap and OP-Amp. The purpose is used to generated a
stable power - V
voltage – V
generated V
The α is the setting of CT[4:0] of Register CSTR. When CT[4:0]=1Fh then V
The resistor ratio(V
total eight cases - 3/3.5/4/4.5/5/5.5/6/6.4. Refer to the description of Bit[5..3] of register RCR_B on
Chapter 5-2. If want to use external resistor divisor then refer to the Bit2 of register DRCR_B and
Figure 6-27b.
The V
REF
of RA8816 is supplied from internal circuit or external V
IREF
0
. The basic formula is as following:
0
to generate a reference voltage V
for Voltage Follower. The RA8816 also built-in a 32-level adjust circuit and a fixed
REF
Figure 6-27b: Use external Resistor Divisor
V
0
and V
= (1+R1/R2) * V
R
2
Figure 6-24: Voltage Regulator
0
R
R
) of Voltage Regulator is adjustable by register DRCR_B. There are
1
2
V
REF
37/68
REF
V0
VR
= (1+R1/R2)*(1-(62-2α)/162)*V
R
RA8816
1
REF
. This V
V
144x65 Character/Graphic LCD Driver
0
REF
REF
Pin. Please refer to Table 6-3:
is for for Voltage Regulator to
IREF
REF
=V
www.raio.com.tw
IREF
.
RA8816