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參數(shù)資料
| 型號(hào)： | UPD161401P |
| 廠商： | NEC Corp. |
| 英文描述： | CABLE ASSEMBLY; N MALE TO TNC MALE; 50 OHM, RG214/U COAX, DOUBLE SHIELDED; 12" CABLE LENGTH |
| 中文描述： | 256色，1/80-DUTY LCD控制器/驅(qū)動(dòng)器，片內(nèi)RAM |
| 文件頁數(shù)： | 42/124頁 |
| 文件大?。?/td> | 647K |
| 代理商： | UPD161401P |
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Data Sheet S15726EJ2V0DS
42
μ
PD161401
5.6.4
Level voltage control by operational amplifier
Although the
μ
PD161401 has a power-saving power supply circuit, the display quality may be degraded if it is used to
drive a high-load LCD panel. The driving capability of the segment output can be controlled as shown in
Table 5
18
by
LCS1 and LCS0 of power system control register 5 (R56), and the driving capability of the common outputs can be
controlled as shown in
Table 5
19
by LCC1 and LCC0 of the same register. By controlling the driving capability, the
display quality and power consumption may be improved. Determine the driving capability in accordance with the actual
display status. If the display quality is not sufficiently improved in any driving mode, it will be necessary to supply the
LCD drive voltage from an external power supply.
In addition, the operational amplifier driving modes shown in
Table 5
20
can be selected by the setting of HPM1 and
HPM0, so that the wait time to stabilize the supply voltage immediately after the power has been turned ON or OFF can
be shortened.
PSM1 specifies whether a boosting voltage of V
DD2
×
2 is applied to the V
LC3
or V
LC4
level voltage follower of (refer to
Table 5
21
). If a voltage boosted two-fold is applied to the voltage follower circuit, the current consumption may be
reduced.
Thoroughly confirm and evaluate the V
LC3
and V
LC4
levels of the LCD panel with the actual system to determine
whether the two-fold LCD drive voltage is to be supplied.
PSM0 can be used to set the current value of all the voltage follower circuits as shown in
Table 5
22
.
Table 5
18. Setting Driving Capability of Segment Outputs (LCS1, LCS0 = 0, 0)
LCS1
LCS0
Segment Output Driving Capability (unit: fold)
0
0
1
1
0
1
0
1
One
Two
Four
Eight
Table 5
19. Setting Driving Capability of Common Outputs (LCS1, LCS0 = 0, 0)
LCC1
LCC0
Common Output Driving Capability (unit: fold)
0
0
1
1
0
1
0
1
Two
Four
Eight
Sixteen
Table 5
20. Setting Operation Mode of Operational Amplifier
HPM1
HPM0
Mode Setting
0
0
1
1
0
1
0
1
Normal mode
Power supply ON mode 1
Power supply OFF mode
Power supply ON mode 2
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