Illumination
Display backlight illumination
There are 6 LEDs in Arden LCD display, two LEDs in series and three LED lines. There is a 5–channel high side
WLED driver, ANT drives the LEDs and the driver enable/PWM signal, CABC comes from the Arden display
module.
Key illumination
MENU, SEND and END keys illumination is supported and is handled by RGB 3-channel LED driver, NJOY. One
white LED (V2405), one green LED (V2406) and one red LED (V2407) are used for MENU, SEND and END keys
illumination. The white LED is connected to the B channel, the green LED to the G channel, and the red LED
to the R channel of the NJOY LED driver.
Charging illumination
The MENU key white LED (V2405) is used for charging indication.
The MENU key white LED is connected to the B output of the NJOY LED driver and glows for indicating USB or
Dynamo charging controlled by SW and when the charging indication not yet appears on the display. This
LED is also connected to Gazoo/Pearl CHIND pin which turns the LED on during dead battery USB charging,
but not during dead battery Dynamo charging.
Figure 72 Illumination
Keyboard interface
MENU key (Home key), Volume-up and Volume-down key, Lock key, Send key and Camera Capture key are
directly connected to RAPU BB ASIC.
The combined Power off/END key is connected to PEARL BB ASIC.
Accelerometer
The 3D accelerometer (N1103) is connected to RAPU via two GENIOs (INT1=Genio12, INT2=Genio44) and I2C_0
bus. Supply voltages are VIO (1.8 V) and VAUX1 (2.8 V).
RM-701
System Module
Issue 1
COMPANY CONFIDENTIAL
Page 6 – 23
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