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3.5.14 LCD Illumination
There are 3 LEDs in the LCD module for LCD backlighting.
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3.5.15 Audio Circuit
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When a call is established, MICBIAS signal goes up to '2.5V' in the MG200. IOTA(ABB) provides
both 2.0V and 2.5V for MICBIAS to circuit designer. VA201, VA202 are employed to enhance ESD
immunity.
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Figure 20. LCD Back-light Scheme
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Figure 21. Microphone system
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3. H/W CIRCUIT DESCRIPTION
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