User Guide

NSM–5
UI section
PAMS Technical Documentation
Page 10
Issue 1 02/2002
 Nokia Corporation
inputs and earphone outputs. In the XMICN line there is a 1.0 kW pull-
down in the transceiver. The PPH–1 has a low resistance pullup
compared to the transceiver pulldown. When there is no call going, the
AUXOUT is in high impedance state and the XMICN and XMICP is pulled
down. When a powered PPH–1 is connected, the XMICP is pulled up.
The switch inside the system connector is connected to the HeadDet line
(in MAD), an interrupt is given due to both connection and disconnection.
In PPH–1 device has two operating mode device with external micro-
phone and without external microphone. When internal microphone is
used the detection signal (EAD) is higher than when external microphone
is used.
NOTE I: If the PPH–1 is connected power off mode the transceiver can
not detect if device is a headset or a PPH–1 connected. When PPH–1 is
powered on it is possible to detect when case of PPH–1.
NOTE II: If the external microphone is connected from or disconnected to
PPH–1 it is not possible for transceiver to detect when that happens.
Internal audio connections
The speech coding functions are performed by the DSP in the MAD2 and
the coded speech blocks are transferred to the COBBA for digital to ana-
log conversion, down link direction. In the up link direction the PCM coded
speech blocks are read from the COBBA by the DSP.
Display Circuit
The display circuit includes LCD module UX7 and two capacitors. The
LCD module is COG (Chip on Glass) technology. The connection method
for chip on the glass is ACF, Adhesive Conductive Film. The LCD module
is connected to UI board with connector. Capacitors are placed on PWB.
The display driver includes hw–reset, voltage tripler or quadrupler which
depends on temperature, temperature compensating circuit and low pow-
er control. Driver includes 84x48 RAM memory which is used when some
elements are create on display. Elements can be created with software.
Driver doesn’t include CG–ROM. One bit in RAM is same as one pixel on
display.