EM65168 ELAN Microelectronics Corp, EM65168 Datasheet - Page 19

• Manufacturer Part Number: EM65168
• Description: 80 Com/seg Lcd Driver
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 04.26.2006
(This specification is subject to change without further notice)
The internal resistor select (IRS) and (IR2, IR1, IR0) are selected for the V1
voltage regulator internal resistance ratio.
IRS=0: internal regulator resistor is used.
IRS=1: internal regulator resistor is not used (external resistor is used)
The V1 voltage can be calculated using equation A within the range where
VDD<V1≦VOUT
Example: Default: IRS=0 (internal regulator resistor is used), (IR2, IR1, IR0) = (0, 1, 0),
When IRS=0 (internal regulator resistor is used), (IR2, IR1, IR0) = (0, 1, 1), and
The output voltage of V1 is determined by function of the V1 voltage regulator ratio
register (1+Rb/Ra), and the electric volume resistor (REG5~REG0).
Note: When external resistor is used (Fig 7-8 b),
1. Ra and Rb values must to be in MΩ level. For example, if the desired value of
2. Add a capacitor across V1 and Vreg, and the recommended value of C is
V
V
1
1
=
(1+Rb/Ra) is 3.0, we give Ra=1 MΩ and Rb=2 MΩ.
10nF~100nF.
=
⎛ +
⎜
⎝
⎛ +
⎜
⎝
V
1
1
1
Ra
Ra
=
(REG5~0) = (100000)
and (REG5~0) = (000000)
Rb
Rb
⎛ +
⎜
⎝
1
⎞
× ⎟
⎠
⎞
× ⎟
⎠
Ra
V
Rb
V
EV
EV
IR2
0
0
0
0
1
1
1
1
⎞
× ⎟
⎠
*
*
(
(
V
. 0
. 0
EV
IR1
97
97
0
0
1
1
0
0
1
1
*
~
~
(
97
. 1
. 1
IR0
0
1
0
1
0
1
0
1
03
03
~
103
)
)
=
=
4
4
%
Resistor Ratio (1+Rb/Ra)
0 .
5 .
)
×
×
1
. 1
2 .
606
( *
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
. 0
( *
97
. 0
97
~
. 1
~
80 COM/SEG LCD Driver
03
. 1
)
03
=
)
. 4
=
Equation A
656
. 7
01
V
V
EM65168
~
~
. 4
. 7
944
44
• 15
V
V