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參數(shù)資料
| 型號： | GM5125-H |
| 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)： | 21/58頁 |
| 文件大?。?/td> | 1505K |
| 代理商： | GM5125-H |
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***
Genesis Microchip Confidential ***
gm5115/25 Preliminary Data Sheet
June 2002
12
C5115-DAT-01H
The TCLK oscillator uses a Pierce Oscillator circuit. The output of the oscillator circuit,
measured at the TCLK pin, is an approximate sine wave with a bias of about 2 volts above
ground (see Figure 5). The peak-to-peak voltage of the output can range from 250 mV to 1000
mV depending on the specific characteristics of the crystal and variation in the oscillator
characteristics. The output of the oscillator is connected to a comparator that converts the sine
wave to a square wave. The comparator requires a minimum signal level of about 50-mV peak to
peak to function correctly. The output of the comparator is buffered and then distributed to the
gm5115/25 circuits.
~ 2 Volts
3.3 Volts
250 mV peak to peak
to
1000 mV peak to peak
time
Figure 5.
Internal Oscillator Output
One of the design parameters that must be given some consideration is the value of the loading
capacitors used with the crystal as shown in Figure 6. The loading capacitance (C
load
) on the
crystal is the combination of C
L1
and C
L2
and is calculated by C
load
= ((C
L1
* C
L2
) / (C
L1
+ C
L2
)) +
C
shunt
. The shunt capacitance C
shunt
is the effective capacitance between the XTAL and TCLK
pins. For the gm5115/25 this is approximately 9 pF. C
L1
and C
L2
are a parallel combination of the
external loading capacitors (C
ex
), the PCB board capacitance (C
pcb
), the pin capacitance (C
pin
), the
pad capacitance (C
pad
), and the ESD protection capacitance (C
esd
). The capacitances are
symmetrical so that C
L1
= C
L2
= C
ex
+ C
PCB
+ C
pin
+ C
pad
+ C
ESD
. The correct value of C
ex
must be
calculated based on the values of the load capacitances. Approximate values are provided in
Figure 6.
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