User Guide

NPM-10 (3595)

System Module CC Technical Documentation

ASIC. UEM provides A/D and D/A conversion of the in-phase and quadrature receive and

transmit signals and also A/D and D/A conversions of received and transmitted audio

signals to and from the user interface. The UEM supplies the analog signals to the RF

section according to the UPP DSP digital control. The RF ASIC is controlled through UPP

RFBUS serial interface. There also are the separate signals for PDM-coded audio. Digital

speech processing is handled by the DSP inside the UPP ASIC. The UEM ASIC is a dual-

voltage circuit supplying the digital section with 1.8 V and the analog section with

2.78 V. VBAT is also used in some blocks.

The baseband supports both internal and external microphone inputs and speaker out-

puts. Input and output signal source selection and gain control is handled by the UEM

according to control messages from the UPP. Keypad tones, DTMF, and other audio tones

are generated and encoded by the UPP and transmitted to the UEM for decoding.

NPM-10 has two external control interfaces: FBUS and MBUS. The serial control inter-

faces can be accessed through the test pads located in the battery area.