User Guide

PAMS Technical Documentation System Module & UI
NHM-8NX
Issue 1 05/02 ãNokia Corporation Page 7
The 32768 Hz clock is fed to the UPP as a sleep clock.
The communication between the UEM and the UPP is done via the bi-directional serial
buses CBUS and DBUS. The CBUS is controlled by the MCU and operates at a speed of 1
MHz. The DBUS is controlled by the DSP and operates at a speed of 13 MHz. Both pro-
cessors are located in the UPP.
The interface between the baseband and the RF section is mainly handled by the UEM
ASIC. UEM provides A/D and D/A conversion of the in-phase and quadrature receive and
transmit signal paths 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 RF
section according to the UPP DSP digital control. RF ASIC MJOELNER is controlled
through UPP RFBUS serial interface. There are also separate signals for PDM coded audio.
Digital speech processing is handled by the DSP inside UPP ASIC. UEM is a dual voltage
circuit, the digital parts are running from the baseband supply 1.8V and the analog parts
are running from the analog supply 2.78V also VBAT is directly used by 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 done 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. NHM-
8NX has two external serial control interfaces: FBUS and MBUS. These busses can be
accessed only through production test pattern as described in section Test Interfaces.
NHM-8NX transceiver module is implemented on 6 layer selective OSP/Gold coated PWB.
Technical Specifications
Operating conditions
Temperature Conditions
Table 1: Temperature conditions for NHM-8
Absolute Maximum Ratings
Table 2: Absolute Maximum Ratings
Environmental condition Ambient temperature Remarks
Normal operation -25 ° C … +55 °C Specifications fulfilled
Reduced performance -40 °C ..-25 °C
and +55 °C … +85 °C
No operation and/or storage < -40 °C or > +85 °C No storage or operation. An attempt to
operate may damage the phone perma-
nently
Signal Rating
Battery Voltage -0.3 ... 5.4V (VBAT LIM2H+))