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參數(shù)資料
| 型號(hào)： | ML9050 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | 132-Channel LCD Driver with Built-in RAM for LCD Dot Matrix Displays |
| 中文描述： | 132通道液晶內(nèi)置液晶點(diǎn)陣顯示RAM的驅(qū)動(dòng)程序 |
| 文件頁(yè)數(shù)： | 21/71頁(yè) |
| 文件大?。?/td> | 472K |
| 代理商： | ML9050 |
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Semiconductor
ML9050/9051
21/71
PEDL9050-02
Voltage adjustment circuit
The voltage multiplier output VOUT produces the LCD drive voltage V1 via the voltage
adjustment circuit. Since the ML9050/9051 incorporates a high accuracy constant voltage
generator, a 64-level electronic potentiometer function, and also resistors for voltage V1 adjustment,
it is possible to build a high accuracy voltage adjustment circuit with very few components. In
addition, the ML9050/9051 is available in three models with the temperature gradients of - (1)
about -0.05%/C, (2) about -0.2%/C, and (3) external input (input to pin VRS), as a VREG option.
(a) When the internal resistors for voltage V1 adjustment are used
It is possible to control the LCD power supply voltage V1 and adjust the intensity of LCD display
using commands and without needing any external resistors, if the internal voltage V1 adjustment
resistors and the electronic potentiometer function are used. The voltage V1 can be obtained by
the following equation A-1 in the range of V1<VOUT.
V1 = (1+(Rb/Ra)) VEV = (1+(Rb/Ra)) (1–(
a
/324)) VREG (Eqn. A-1)
Fig. 9
VREG is a constant voltage generated inside the IC and its value is constant as given in Table 9
at Ta = 25C.
+
VEV (Constant voltage generator +
electronic potentiometer)
–
V
SS
V1
Internal Ra
Internal Rb
Fig. 8
*1:
The voltage range of V
IN
should be set so that the voltage at the pin V
OUT
does not exceed
the absolute maximum rating.
V
OUT
= 7
￥
V
IN
= 17.5V
*1 V
IN
= 2.5 V
V
SS
= 0 V
V
OUT
= 6
￥
V
IN
= 18 V
*1 V
IN
= 3 V
V
SS
= 0 V
Voltage relationship in 7-times multiplication
Voltage relationship in 6-times multiplication
The voltage relationships in voltage multiplication are shown in Fig. 8.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML9051 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:132-Channel LCD Driver with Built-in RAM for LCD Dot Matrix Displays |
| ML9051G | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:132-Channel LCD Driver with Built-in RAM for LCD Dot Matrix Displays |
| ML9055A | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:LCD Controller/Driver |
| ML9055A-02 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:LCD Controller/Driver |
| ML9055A-02DVVAZ01L | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:LCD Controller/Driver |
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