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參數(shù)資料
| 型號(hào)： | UPD161401W |
| 廠商： | NEC Corp. |
| 英文描述： | 256-COLOR, 1/80-DUTY LCD CONTROLLER/DRIVER WITH ON-CHIP RAM |
| 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(yè)數(shù)： | 39/124頁(yè) |
| 文件大?。?/td> | 647K |
| 代理商： | UPD161401W |
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Data Sheet S15726EJ2V0DS
39
μ
PD161401
5.6.3
Voltage regulator circuit
The boosted voltage from V
OUT
is supplied to the voltage regulator circuit and output to the LCD drive voltage pin V
LCD
.
Because the
μ
PD161401 has a 128-step electronic volume function and an internal V
LCD
adjuster resistor, a high-
accuracy voltage regulator circuit can be configured by adding only a few components.
V
LCD
regulator circuit
(a) When internal resistor for adjusting V
LCD
is used
By using the internal resistor for adjusting V
LCD
and the electronic control function, LCD drive voltage V
LCD
can be
controlled and the contrast of the LCD can be adjusted by using commands. In this case, no external resistor is
necessary. Where V
LCD
< V
OUT
, the value of V
LCD
can be calculated as follows:
Example
Calculating value of V
LCD
(where V
LCD
< V
OUT
)
V
LCD
= (1 + Rb
EV
V
LCD
= (1 + Rb
) V
REG
Remark
V
EV
= (1
) V
REG
Figure 5
16. Example of Circuit Using Internal Resistor for Adjustment V
LCD
V
EV
(constant power supply + electronic volume)
V
LCD
+
Rb
Ra
V
REG
is the internal fixed power source of the IC and has three types of temperature characteristic curves. These
temperature characteristic curves can be adjusted as shown in
Table 5
15
depending on the setting of power system
control register 1 (R52) (TCS2 to TCS0).
Table 5
15
shows V
REG
at T
A
= 25
°
C.
Table 5
15. Adjusting Temperature Characteristic Curve
Status
TCS2
TCS1
TCS0
Temperature Gradient (unit: %/
°
C)
0.12
0.13
0.15
0.17
V
REG
(TYP.) (unit: V)
Internal power supply
0
0
0
1.77
0
0
1
1.69
0
1
0
1.63
0
1
×
1
×
1.59
When external reference
power supply is used
1
Ra
256
256
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