I2C buses
There are 4 I2C-buses in the APE side. Two I2C-buses are reserved for communication between OMAP and its
EM ASIC. The other two are used to control different peripheral devices.
Table 15 I2C bus configurations
Component I2C bus Comment
TWL5030 I2C_1 Gaia
BQ27200 I2C_2 Current Gauge
BQ24150 I2C_2 USB charging
ADP1653 I2C_2 Camera Flash
Acme Lite I2C_2 Camera B
LP5523 I2C_2 LED driver
SI4713 I2C_2 FM TX
TSL2563 I2C_2 Ambient light sensor
AIC34 I2C_2 Audio codec
TPA6130 I2C_2 Headphone PA
FM_RX I2C_3 FM RX
BCM2048 I2C_3 Accelerometer
Stingray 5Mpix Camera I2C_3 Main camera
User interface
Display module
The display is a 3.5” 800 x 480 transflective LTPS LCD display which supports 16 million colours. The display
interface is a differential serial interface called CDP. It has a differential clock and two differential data lines.
It uses LoSSi as a control interface. The display has two operating modes. Normal and a sleep mode. The
display module is connected to the main flex with a board-to-board connector. The display is backlit with 6
LEDs and a separate backlight driver is used to power the LEDs as two series of 3.
The display also has content adaptive backlight control. It means that backlight can be increased or decreased
from a wanted value based on the content on the screen thus saving in power consumption.
Touch screen
The main input method for the user interface is a resistive touch screen. The touch screen is connected with
a flex connector to the display module flex. There are 4 lines coming from the touch window, two for X-axis
and two for Y-axis to the touch screen controller which converts the analog voltages from the touch screen
to digital values that are then interpreted as coordinates on the screen by SW. The touch screen controller
is connected to OMAP via standard SPI interface.
Keyboard
The main text input method is a 3-row qwerty keyboard. Keyboad is wired to Gaia’s keyboard matrix as rows
and columns. While pressing a key a certain row and column are activated and SW then interprets that as
the key that is marked on the keyboard.
RX-51
System Module
Page 6 –16 COMPANY CONFIDENTIAL Issue 1
Copyright © 2009 Nokia. All rights reserved.
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