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ViewSonic Corporation
Confidential - Do Not Copy
VG921m-2
4. Circuit Description
1. Power supply (DC/DC Converter)
This brick convert is the 110-220AC input voltage to 12V AND 5V output for inverter,
audio, panel and system controller use.
It consists of a PWM IC (CM0565R, U101)
2. Scaling controller
The ADC is to convert RGB analog signal to digital signal that scaling chip can
acknowledge.
The HSYNC input receives a logic signal and provides the frequency reference for
pixel clock generation.
The scaling IC is to converts the input signal ranging from VGA to SXGA.
GENERAL DESCRIPTION
The TSUM57AK is a high performance, and fully integrated graphics processing IC solution
for LCD monitors with resolutions up to SXGA. It is configured with an integrated triple-ADC/PLL,
a high quality scaling engine, an on-screen display controller, a built-in output clock generator,
and LVDS display interface. To further reduce system costs, the TSUM57AK also integrates
intelligent power management .
Summary of Contents for VG921m-2
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