HM17CM4096 ETC2 [List of Unclassifed Manufacturers], HM17CM4096 Datasheet - Page 38

• Manufacturer Part Number: HM17CM4096
• Description: 128XRGBX162 OUTPUT LCD DRIVER IC with built-in RAM
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

(21) VOLTAGE BOOSTING CIRCUIT
(22) ELECTRIC VOLUME
(23) VOLTAGE REGULATOR CIRCUIT
by adjusting V
controlled levels by setting 7 bit electric volume register.
using V
regulator is output at V
voltage is stable because boosting voltage level is higher than the amplified regulator voltage V
And so, stable voltage level can be generated even if there is load variation.
V
and C
V
6-times/ 7-times boosted voltage is output through V
REG
OUT
Special care should be taken so that the voltage of VOUT would not exceed 18V MAX.
VOUT voltage exceeding 18V can cause malfunction and reliability problem.
The electric volume is within voltage converting circuit and the brightness of LCD can be controlled
The LCD driving voltage V
The voltage regulator circuit is within voltage converting circuit and generates regulated voltage
By connecting capacitor CA
is used as input voltage of electric volume circuit to generate LCD driving voltage.
port. The boosting coefficient can be set by command and 2-times/ 3-times / 4-times/ 5-times/
At application, specific boosting coefficient is used, refer to the following description.
5
- , C
REF
At 2-times boosting is designed, connect boosting capacitor CA
At 3-times boosting is designed, connect boosting capacitor CA
At 4-times boosting is designed, connect boosting capacitor CA
At 5-times/ 6-times/ 7-times boosting are same structures with upper case.
C
and open C
C
input with magnification by adjusting internal resistor. The generated voltage by voltage
V
V
6
2
3
+ and C
EE
SS
-, C
+ and C
LCD
=3V
=0V
3
+, C
level with command.
3
V
3
- , and open C
6
3
-, C
-, V
OUT
+,C
REG
=9V
4
3
OUT
+, C
3-times boosting
-, C
terminal.
and V
4
4
LCD
-, C
+, C
1
between C
5
4
4
+, C
is generated by selecting 1 level within 128 step electric volume
-, C
+, C
SS
, n-time boosted voltage of V
5
5
-, C
4
+, C
-, C
Even though boosted voltage variation, generated regulator
6
5
5
+, C
-, C
+, C
1
+ and C
6
6
- terminals.
5
+, C
-, C
6
6
- terminals.
+, C
1
OUT
V
-, C
EE
V
6
- terminals
SS
=2.5V
port.
2
=0V
+ and C
V
OUT
=17.5V
1
1
2
1
EE
-, C
between C
between C
between C
- V
7-times boosting
3
+ and C
SS
can be generated through
HM17CM4096
1
1
1
+ and C
+ and C
+ and C
3
-, C
4
1
1
1
+ and C
- , and open C
- , C
- , C
2
2
+ and C
+ and C
4
-, C
- 38 -
REG
2
- ,
2
5
2
- ,
+,
+
.