CCS Technical Documentation
Troubleshooting - Baseband
RH-34
Issue 1 11/2003 Confidential
©
2003
Nokia Corporation
Page 21
microphone; MIC2 input is used for headsets (HDB-4). MIC3 input is used for the Univer-
sal Headset. Every microphone input can have either a differential or single ended AC
connection to UEM circuit. In RH-34, the internal microphone MIC1 and external micro-
phone MIC2 for Tomahawk accessory detection are both differential. However, the Uni-
versal Headset interface is single-ended. The microphone signals from different sources
are connected to separate inputs at UEM. Inputs for the microphone signals are differen-
tial type. Also, MICB1 is used for MIC1 and MICB2 is used for MIC2 and MIC3 (Universal
Headset).
Display and Keyboard
LEDs are used for LCD and keypad illumination in RH-34. There are three LEDs for the
LCD and eight LEDs for the keypad. The signal use to drive the LED driver for the LCD and
keyboard is KLIGHT.
Color LCD is used in RH-34. Interface uses 9-bit data transfer. The interface is quite sim-
ilar to DCT3-type interface, except Command/Data information is transferred together
with the data. D/C bit set during each transmitted byte.
FM Radio
FM radio circuitry is implemented using highly integrated radio IC, TEA5767HN. FM radio
circuitry is controlled through serial bus (GenlOS) interface by the MCU SW.