ra8816 RAIO Technology Inc., ra8816 Datasheet - Page 34

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

Preliminary Version 1.6
RAiO TECHNOLOGY INC.
6-4 LCD Driver and Power Circuit
The driver circuit of RA8816 is a low power design. The power supply circuit is consist of Booster,
Voltage Regulator and Voltage Follower. For different requirement of power, the Driver Control
Register(REG[11h]) is used to enable or disaable for related circuit.
The user could use the setting of register REG[11h] to select the internal or external power. Please
refer to the following of Table 6-2.
Driver Control
1
0
1
0
0
0
D7
(DRCR_A)
CK_BS
Register
1
1
0
0
0
0
D6
1
1
1
1
0
0
Figure 6-23: LCD Driver and Power Supply Circuit Block
D5
Booster
C x n
BOFF
1
1
1
1
1
0
D4
VLCD
Table 6-2: Setting Table of Power Circuit
VREF
Booster
Regulator
OFF
OFF
OFF
OFF
ON
ON
VR
V0
Regulator
Voltage
R-String
ROFF
OFF
OFF
ON
ON
ON
ON
LT
LP
34/68
Voltage(
Don’t Need
Don’t Need
Reference
of Voltage
Regulator
Follower
Voltage
External
External
Internal
Internal
V
V[4:0]
REF)
V1
V2
V3
V4
144x65 Character/Graphic LCD Driver
Follower
Voltage
Latch x m
OFF
Latch x n
Segment
ON
ON
ON
ON
ON
D[n:0]
COM /
Driver
DOFF
COM[63:0]
COMS
SEG[143:0]
VLCD, VREF,
External Power
V0~V4, VDD
VREF, VDD
VLCD
V0, VDD
VDD
VDD
www.raio.com.tw
,
VDD
RA8816