Internal Audio; Fig 6 Bsi Detection - Nokia RH-9 Series Ccs Technical Documentation

RH-9
System Module & UI
SIM
C5 C6 C7 C8
C1 C2 C3
C4
From Battery Type
contact
The internal clock frequency from UPP CTSI block is 13 MHz in GSM. Thus to achieve the
minimum starting SIMCardClk rate of 3.25 MHz (as is required by the authentication
procedure) and the duty cycle requirement of between 40% and 60% then the slowest
possible clock supplied to the SIM has to be in the GSM system clock rate of 13/4 MHz.

Internal Audio

Earpiece
The earpiece selected for RH-9 is the standard DCT3 13-mm earpiece from PSS (previ-
ously used for 3210, 3310, 6210, 7110 among others). The earpiece design is leak tolerant.
The internal earpiece is a dynamic earpiece with an impedance of 32 ohms. The earpiece
is a low impedance type, since the sound pressure is to be generated using current and
not voltage as the supply voltage is restricted to 2.7V. The earpiece is driven directly by
the UEM and the earpiece driver in UEM is a bridge amplifier.
UEM
EARP
EARN
Earpiece Acoustic Design
The earpiece acoustics is designed to be type approved by type 3.2, low leak artificial ear
Page 34
Figure 7: UEM & UPP SIM connections
GND
SIMDATA
SIMCLK
SIMRST
VSIM
UEM
SIMIF
register
UEM
digital
logic
BSI
Figure 8: Speaker Interface
10
10
ãNokia Corporation
CCS Technical Documentation
SIMIO
SIMIO
SIMClk SIMClk
Data
Data
UPP
UIF Block
UEMInt
CBusDa
CBusEnX
CBusClk
EARP
EARN
GND
Issue 1 11/02