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参数资料
| 型号： | GMZAN3T |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | XGA ALALOG INTERFACE LCD MONITOR CONTROLLER |
| 中文描述： | ALALOG的XGA液晶显示器接口控制器 |
| 文件页数： | 13/53页 |
| 文件大小： | 556K |
| 代理商： | GMZAN3T |
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gmZAN3 Preliminary Data Sheet
C0523-DAT-01G
20
July 2003
Ge nes i s Microc hip Confid e n tia l
http:// w ww . g enesis-mic r ochip.com
a wide range of conditions. The oscillator circuit also minimizes the overdrive of the crystal, which
reduces the aging of the crystal.
When the gmZAN3 is in reset, the state of the HDATA2/AD2/OSC_SEL pin is sampled. If the pin is
pulled high by connecting to VDD through a pull-up resistor (10K
recommended, 15K maximum)
then internal oscillator is enabled. In this mode a crystal resonator is connected between TCLK and the
XTAL with the appropriately sized loading capacitors CL1 and CL2. The size of CL1 and CL2 are
determined from the crystal manufacturer’s specification and by compensating for the parasitic
capacitance of the gmZAN3 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
Vdda
XTAL
TCLK
OSC_OUT
TCLK Distribution
Internal Pull Down
Resistor
~ 60K
gmZAN3
111
110
126
Vdd
180 uA
100 K
CL1
CL2
Internal Oscillator Enable
Vdda
HDATA2/AD2/OSC_SEL
10 K
Figure 5.
Using the Internal Oscillator with External Crystal
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 6). 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
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