User Guide

Figure 61 I/O expander and keyboard matrix

Display module

HW53 supports S1D13747 display controller (D2450). S1D13747 controlling is done via LOSSI IF and data is

transferred via VISSI 12 bit IF. The display is connected to display controller shared MESSI 8 bit bus.

Figure 62 Display module

Backlight and illumination

The LED driver LP5521 (N2499) has three different outputs to drive LEDs. Navi LED is controlled by the separate

output from ITU/S60 LEDs to enable breathing during sleep mode.

RM-348; RM-349; RM-350

System Module and User Interface

Issue 2 COMPANY CONFIDENTIAL Page 8 –17