參數(shù)資料
型號(hào)： LC73101C
文件頁(yè)數(shù)： 14/34頁(yè)
文件大小： 217K
代理商： LC73101C
Power Supply Circuit
This circuit is a low power consumption power supply circuit that creates the voltages required for LCD drive. It can only
be used when the LC73101C is in master mode. It consists of a voltage step-up circuit, a voltage adjustment circuit, and a
voltage follower circuit. The on/off states of the voltage step-up circuit and the voltage adjustment circuit in the power
supply can be controlled individually with the Power Control Set command. This allows external power supply levels to
be used in combination with certain of the functions of the internal power supply circuit. Table 7 lists the functions
controlled by the 3 bits of data in the Power Control Set command, and table 8 presents examples of possible
combinations of functions.
Voltage step-up circuit
The LC73101C's built-in voltage step-up circuit can generate potentials that are 3
×
, 4
×
, 5
×
, and 6
×
that of the potential
between V
SS2
and V
DD
. Figure 7 shows the relationships between these potentials.
Figure 7 The relationships between these potentials
No. 6853-14/34
LC73101C
Table 7 Power Control Set Command Bit Functions
Bit
Item set
Bit value
1
0
D2
Voltage step-up circuit
ON
OFF
D1
Voltage adjustment circuit (V adjustment circuit)
ON
OFF
D0
Voltage follower circuit (V/F circuit)
ON
OFF
Table 8 Sample Combinations
D2
D1
D0
Step-up circuit
V adjustment circuit
V/F circuit
External voltage
input
Step-up system
pins
1.
Only the internal power supply used
1
1
1
G
G
G
G
G
G
V
SS2
Used
2.
Only the V adjustment and V/F circuits used
0
1
1
×
×
×
G
G
G
G
V
OUT
, V
SS2
V
5
, V
SS2
V
1
to V
5
Open
3.
Only the V/F circuit used
0
0
1
×
×
G
G
Open
4.
External power supply only
0
0
0
×
Open
Note: The step-up system pins are the CAP1+, CAP1–, CAP2+, CAP2–, CAP3+, CAP3–, CAP4+, CAP4–, CAP5+, and CAP5– pins.
While combinations other than the above are possible, these other combinations are impractical and are not recommended.
V
SS2
= 0V
V
DD
= 3V
V
OUT
= 9V
V
SS2
= 0V
V
DD
= 3V
V
OUT
= 12V
V
SS2
= 0V
V
DD
= 3V
V
OUT
= 15V
V
SS2
= 0V
V
DD
= 3V
V
OUT
= 18V
3
×
step-up
4
×
step-up
5
×
step-up
6
×
step-up
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