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參數(shù)資料
| 型號： | GM5115 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | ONPANEL LCD PANEL CONTROLLER |
| 中文描述： | ONPANEL液晶顯示器控制器 |
| 文件頁數(shù)： | 20/58頁 |
| 文件大?。?/td> | 1505K |
| 代理商： | GM5115 |
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***
Genesis Microchip Confidential ***
gm5115/25 Preliminary Data Sheet
June 2002
11
C5115-DAT-01H
The gm5115 TCLK oscillator circuitry is a custom designed circuit to support the use of an
external oscillator or a crystal resonator to generate a reference frequency source for the gm5115
device.
4.1.1 Using the Internal Oscillator with External Crystal
The first option for providing a clock reference is to use the internal oscillator with an external
crystal. The oscillator circuit is designed to provide a very low jitter and very low harmonic clock
to the internal circuitry of the gm5115. An Automatic Gain Control (AGC) is used to insure
startup and operation over a wide range of conditions. The oscillator circuit also minimizes the
overdrive of the crystal, which reduces the aging of the crystal.
When the gm5115/25 is in reset, the state of the ROM_ADDR13 pin (pin number 10) is sampled.
If the pin is left unconnected (internal pull-down) then internal oscillator is enabled. In this mode
a crystal resonator is connected between TCLK (pin 152) and the XTAL (pin 151) with the
appropriately sized loading capacitors C
L1
and C
L2
. The size of C
L1
and C
L2
are determined from
the crystal manufacturer’s specification and by compensating for the parasitic capacitance of the
gm5115/25 device and the printed circuit board traces. The loading capacitors are terminated to
the analog VDD power supply. This connection increases the power supply rejection ratio when
compared to terminating the loading capacitors to ground.
Reset State Logic
N/C
XTAL
TCLK
OSC_OUT
TCLK Distribution
Internal Pull Down
Resistor
~ 60K
gm5115/25
152
151
10
Vdd
180 uA
100 K
CL1
CL2
Internal Oscillator Enable
Vdda
Vdda
ROM_ADDR13
Figure 4.
Using the Internal Oscillator with External Crystal
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| GM5115-H | ONPANEL LCD PANEL CONTROLLER |
| GM5125 | ONPANEL LCD PANEL CONTROLLER |
| GM5125-H | ONPANEL LCD PANEL CONTROLLER |
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相關(guān)代理商/技術(shù)參數(shù) |
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| GM5115-H | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ONPANEL LCD PANEL CONTROLLER |
| GM5120 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:XGA/SXGA LCD Controller |
| GM5120-H | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:XGA/SXGA LCD Controller |
| GM5125 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ONPANEL LCD PANEL CONTROLLER |
| GM5125-H | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ONPANEL LCD PANEL CONTROLLER |
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