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參數(shù)資料
| 型號： | GM5110-H |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | XGA/SXGA LCD Controller |
| 中文描述： | 的XGA / SXGA LCD控制器 |
| 文件頁數(shù)： | 19/51頁 |
| 文件大?。?/td> | 1379K |
| 代理商： | GM5110-H |
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***
Genesis Microchip Confidential ***
gm5110/20 Preliminary Data Sheet
June 2002
12
C5110-DAT-01C
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 gm5110/20 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 gm5110/20 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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