ra8816 RAIO Technology Inc., ra8816 Datasheet - Page 38

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

Preliminary Version 1.6
RAiO TECHNOLOGY INC.
Figure 6-28A: Use Internal Voltage Follower
6-4-3 Voltage Follower
External V
Internal V
V
Normally the internal V
Reference V
temperature compensation.
The internal Voltage Follower provides V0~V4 power for LCD Driver circuit. Of course, the user
could select internal or external Voltage Follower. The relationship of V0~V4 and VLCD is as
following:
Figure 6-28A shows the circuit of using internal Voltage Follower. For external V0~V4, the
connection is show as Figure 6-28B.
REF
Type
VSS
C2
C2
C2
C2
C2
REF
External
REF
Supply
Power
oltage Circuit is be off too.
DRCR-A Bit6
(EN_R)
X
1
0
VLCD
C2M
C1M
C2P
C1P
VREF
V0
V1
V2
V3
V4
IREF
value is 2.1V.
VLCD > V0 > V1 > V2 > V3 > V4 > GND
DRCR-A Bit5
(EN_G)
Table 6-3: Select V
1
1
0
The Voltage Regulator also provide -0.05% auto adjust for
When Voltage Regulator Circuit off(
38/68
Temperature
Gradient
-0.05
Figure 6-28B Use External Voltage Follower
REF
-
-
144x65 Character/Graphic LCD Driver
VSS
External
Supply
Power
%/ ℃
Unit
-
-
(1-(63-α)/162)*V
EN_G=0) then the
VLCD
C2M
C2P
C1M
C1P
VREF
V0
V1
V2
V3
V4
V
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REF
V
REF
Pin
RA8816
IREF