參數(shù)資料
型號(hào): GM2125
廠商: Electronic Theatre Controls, Inc.
英文描述: ANALOG INTER FACE XGA/SXGA ONPANEL LCD PANEL CONTROLLER
中文描述: 模擬國(guó)際米蘭的XGA / SXGA ONPANEL液晶顯示器控制器
文件頁數(shù): 19/54頁
文件大?。?/td> 1339K
代理商: GM2125
***
Genesis Microchip Confidential ***
gm2115/25 Preliminary Data Sheet
June 2002
17
C2115-DAT-01B
XTAL
TCLK
gm2115/25
141
142
Cex1
Cex2
Internal Oscillator
Cpcb
Cshunt
Cpcb
Cpin
Cpad
Cesd
Cpin
Cpad
Cesd
Vdda
Vdda
CL1 = Cex1 + Cpcb + Cpin + Cpad + Cesd
CL2 = Cex1 + Cpcb + Cpin + Cpad + Cesd
Approximate values:
C
PCB
~ 2 pF to 10 pF (layout dependent)
C
pin
~ 1.1 pF
C
pad
~ 1 pF
C
esd
~ 5.3 pF
C
shunt
~ 9 pF
Figure 6.
Sources of Parasitic Capacitance
Some attention must be given to the details of the oscillator circuit when used with a crystal
resonator. The PCB traces should be as short as possible. The value of C
load
that is specified
by the manufacturer should not be exceeded because of potential start up problems with the
oscillator. Additionally, the crystal should be a parallel resonate-cut and the value of the
equivalent series resistance must be less then 90 Ohms.
4.1.2 Using an External Clock Oscillator
Another option for providing the reference clock is to use a single-ended external clock
oscillator. When the gm2115/25 is in reset, the state of the ROM_ADDR13 (pin 10) is
sampled. If ROM_ADDR13 is pulled high by connecting to VDD through a pull-up resistor
(10K
recommended, 15K
maximum) then external oscillator mode is enabled. In this
mode the internal oscillator circuit is disabled and the external oscillator signal that is
connected to the TCLK pin (pin number 152) is routed to an internal clock buffer. This is
illustrated in Figure 7.
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