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RM-839; RM-840; RM-841
System Module
• Up to 8 additional keys connected to ground possible
• Pressed key (or combination of pressed keys) and duration (0 to 1 s, 10 ms resolution) stored within keypad
registers
• Rescan (0 to 100 ms, 10 ms resolution) to determine that pressed key(s) still the same.
Figure 49 keypad interface
Electronic interface between Baseband and backlight and illumination
The backlight supply is implemented using the integrated boost converter control circuit of external PMU.
Figure 50 LED interface
Issue 1
NOKIA INTERNAL USE ONLY
Page 6 – 21
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