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參數(shù)資料
| 型號(hào)： | LC73101C |
| 文件頁數(shù)： | 15/34頁 |
| 文件大?。?/td> | 217K |
| 代理商： | LC73101C |
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Voltage adjustment circuit
The stepped-up voltage generated at the V
OUT
pin is output as the V
1
LCD drive voltage through the power supply
adjustment circuit. Since the LC73101C provides a reference voltage based on a high-precision constant-voltage
source, an electronic potentiometer with 64 levels, and furthermore, a voltage adjustment resistor built in to the V
1
pin,
a high-precision voltage adjustment circuit can be implemented with a minimal number of external components. Figure
8 shows this voltage adjustment circuit.
Figure 8 Voltage Adjustment Circuit
The formulas below show the relationship between Ra, Rb, V
REG
, V
EV
, and V
1
. The term
α
is the set value of the
electronic potentiometer.
(1) Reference voltage
The LC73101C includes a constant-voltage supply that features a selectable temperature correction coefficient: one of
three slopes can be selected. The Reference Supply Selection command is used to select the slope. This command can
also be used to isolate (disconnect) the internal low-voltage supply so that the reference voltage can be supplied from the
external V
RS
pin. The bits D0 and D1 in the Reference Supply Selection command control these settings. Table 9 lists the
reference voltage V
REG
values that correspond to the D0 and D1 settings.
No. 6853-15/34
LC73101C
V
DD
V
EV
(Reference voltage +
electronic potentiometer)
V1
Internal Ra
(External Ra')
Internal Rb
(External Rb')
(V
R
pin)
+
–
Ra
Rb
V
1
=
V
EV
=
×
V
EV
×
V
REG
1 +
162
1 –
α
Table 9
D1 D0
Setting
V
REG
0
0
Internal reference voltage: Off
Input from the V
RS
pin
–2.5 V
0
1
Temperature coefficient: –0.05%
1
0
Temperature coefficient: –0.1%
–2.5 V
1
1
Temperature coefficient: –0.2%
–2.5 V
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