Display And Keyboard; Flashlight - Nokia RH-66 Troubleshooting Manual

2115i/2116/2116i (RH-66)
Baseband Description and Troubleshooting
UEMC. Inputs for the microphone signals are differential types. Also, MICBIAS1 is used
for MIC1 and MICBIAS2 is used for MIC2. The 2115i/2116/2116i also support a hands-free
speaker, which is driven by an IHF audio amplifier.

Display and Keyboard

The mobile terminal uses light-emitting diodes (LEDs) for liquid crystal display (LCD) and
keypad illumination. There is one LED for the LCD and four LEDs for the keypad. KLIGHT is
the signal used to drive the LED driver for the LCD and keyboard. This signal turns on the
LED driver (N2400).
The mobile terminal also uses an IOS LCD. The interface uses a 9-bit data transfer and is
quite similar to the DCT3 type interface, except the Command/Data information is
transferred together with the data.

Flashlight

The flashlight is driven by the white LED driver and controlled by the UEMC. The
TK65600B-G is an active-high enable device, which is tied to the DLIGHT signal from the
UEMC.
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Figure 14: Waveform for the LCD Interface
©2005 Nokia Corporation
Company Confidential Issue 1 03/2005