參數(shù)資料
型號: S1C621A0F0A0100
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 95/161頁
文件大?。?/td> 1037K
代理商: S1C621A0F0A0100
I-14
EPSON
S1C621A0 TECHNICAL HARDWARE
CHAPTER 3: PERIPHERAL CIRCUITS (Power Supply)
LCD power supply
The on-chip voltage regulator and booster are used to
generate voltage levels (VDD, VL1, VL2 and VL3) needed to
drive the LCDs.
VL2 is obtained by boosting VL1 two times and VL3 is ob-
tained by boosting VL1 three times. VL1 can be adjusted by
feeding it back to the VADJ pin through RA1 and RA2 as
shown in Figure 3.2.2. VL (
≈ VDD - VL1) is defined by follow-
ing equation:
VL
≈ 1 x (RA1 + RA2) / RA1
Example:
VL
RA1
RA2
≈ 1 V
0
≈ 1.5 V
2 M
1 M
An LCD driving voltage suited to each LCD panel can be
obtained by adjusting VL at the VADJ pin.
Fig. 3.2.2
VL Adjust Circuit
RA1
VADJ
VL1
(1 M
)
(2 M
)
VADJ
VL1
RA2
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