User Guide

PAMS
Technical Documentation
NSE–8/9
System Module
Page 2– 34
Issue 1 07/99
Data transmission between the COBBA_GJP and the MAD2PR1 is
implemented using two serial busses, SERRFI for RF digital data and
COBBA_GJP control. PCM for digital audio data.
Digital speech processing is handled by the MAD2PR1 asic.
Last but not least the COBBA_GJP emits the backlight control signals to
the UISWITCH IC, which drives the keyboard– and LCD backlight LEDs.
The Baseband supports 3 microphone inputs together with 2 earphone
outputs.
The mic inputs can be taken from an internal microphone, a headset
microphone or from an external active microphone signal source. The
microphone signals from different sources are connected to separate
inputs at the COBBA_GJP asic.
The output for the internal earphone is a dual ended type output capable
of driving a dynamic type speaker. Input and output signal source
selection and gain control is performed inside the COBBA_GJP asic
according to control messages from the MAD2PR1.
Keypad tones, DTMF, and other audio tones except ringing alert are
generated and encoded by the MAD2PR1 and transmitted to the
COBBA_GJP for decoding.
MAD2PR1 generates a PWM output for the buzzer and a logical high/low
signal for driving the internal vibra motor. These control signals together
with light control are fed to the UIswitch which drives the backlight, vibra
and buzzer units.
The MAD2PR1 communicates via an IIC bus with the EEProm which
contains all user changeable data and tuning values. Additionally the
memory of HD947 is made up of a FLASH Rom and a SRAM for MCU
memory, both sharing a common address– data bus. The DSP memory is
completely integrated into the MAD2PR1 asic.
Two wire and three wire chargers can be connected to the phone. Three
wire chargers are equipped with a control input, through which the phone
gives PWM charging control signal to the charger.
The battery charging is controlled by two different PWM signals, one from
CCONT to the charger, CHARG_CTRL, and one from MAD2PR1 to
PSCC, PSCC_PWM.
The CHARG_CTRL, is constant 25%, to make the phone the master in
case it’s inserted into a DCH–9 deskstand.
The PSCC_PWM duty cycle is determined by the charging software.
A 84 by 48 dot matrix LCD is connected via a zebra connector. The
MAD2PR1 commands the display driver via a serial write only interface.