ML51/ML54/ML56
Sep. 01, 2020
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ML51/M
L54
/M
L56
Series
Tec
hnical Reference
Manual
LCD Driving Voltage Select
6.17.4.2
Followoing table shows the three types of LCD voltage source and how to select.
VLCD_MODE[1:0]
(LCDMODE[1:0])
V
LCD
Range
VLCD / LCD_DH1 / LCD_DH2 pin
Note
External
VLCD
00
1.8 ~ 5.5 V
VLCD pin connect with external voltage
LCD_DH1 and LCD_DH2 can be used as
normal GPIO
V
LCD
V
DD
is acceptable
AV
DD
01
1.8 ~ 3.6 V
VLCD pin floating or connect 0.1uF capactor to
V
SS
LCD_DH1 and LCD_DH2 can be used as
normal GPIO
V
LCD
= V
DD
Internal
Charge
pump
10
2.8 ~ 5.4 V
VLCD pin must connect a capactor to V
SS
. The
remomend value is 1uF.
a capactor must connect between LCD_DH1
and LCD_DH2 pin. The remomend value is
0.1uF.
V
LCD
V
DD
is acceptable
LCD pump up voltage
with limitation
V
LCD(max.)
= 1.8*V
DD.
LCD pump down voltage
without this limitation.
Disable
11
-
-
Table 6.17-1 VLCD Source Selection Table
LCD Driving Current Mode Select And Power Consumption
6.17.4.3
Foillowing table shows all LCD driving mode. Table also list the LCD driving current and the relation
power consumption.
LCD Driving Mode
Control Register
LCD
Driving
Curruent
[1]
Power
Consumption
[2]
R_MODE
(LCDMODE[7])
RE_MODE
(LCDCON1 [1])
BUF_MODE
(LCDMODE[6])
PWR_SAVING
[1:0]
(LCDPWR)
Buffer Mode
0
0
1
00
Level 1 (Max.)
Level 3
Resistor Mode
1
0
0
00
Level 2
Level 1 (Max.)
Buffer Power Saving
Mode
0
0
1
01/10/11
Level 3
Level 4
Resistor Power
Saving Mode
1
0
0
01/10/11
Level 4
Level 2
Resistor Enhance
Mode
1
1
0
-
Level 5(Min.)
Level 5 (Min.)
Note 1:
Level 1 means the LCD driving current is the largest in these modes.
Note 2:
Level 1 means the current of LCD driver module power consumption is the largest in these modes.
Table 6.17-2 LCD Driving Mode Regiter Setting