Lcd Metal Frame; Bottom Connector - Nokia RH-9 Series Ccs Technical Documentation

CCS Technical Documentation
The same pwb outline has been implemented for the SALT speaker. Low ohm coils
L180/L181 are used in series with the speaker for immunity against incoming fields from
the speaker.
Charger lines
Ground from charger is connected directly to common PWB ground for low impedance
path to the battery.
The positive charger line is ESD, EMC and short circuit protected by the circuit: F100,
L100,C100 and V100. The routing is in shielded layer 5 to provide immunity to this line
when in pulse charge mode and to obtain immunity from UEM IC.
Headint
This line is EMC/ESD protected by routing on shielded layer 5 and by placement of resis-
tor R155 close to the bottom connector.
Prod Test Points
Production test points TP2, TP3 and TP7 have 100ohm resistors, implemented in signal
lines to limit bandwidth and improve EMC and ESD performance. These resistors are part
of quad pack R108. Additionally spark gaps are added to improve the ESD robustness.
Battery Supply filtering
Battery supply lines to the UEM IC are filtered with two LC filters Z261,Z264,C261 and
C264. These filters provide immunity against conducted RF noise.
SIM interface
The SIM interface has several levels of protection. All active line are protected/filtered
via SIM ASIP (R386) (Application Specific Integrated Passive, part with RC-filter and
Diodes integrated) and 10pF. The 10pF have shown to reduce 2nd harmonic spurious in
GSM1800 band. Additionally sparkgap has been added on pin 5 for preventing ESD
pulses to jump to UPP.
DC-Out interface
The DC-Out interface is protection with tranzorber diodes (V318) on both "power" and
"CTI" pads.

LCD metal frame

The LCD metal frame is connected to the PWB ground, via springs in all four corners.

Bottom connector

The immunity strategy concerning the bottom connector lines is by shielding all lines to
this part in order to prevent radiation in the phone itself when external accessory is con-
Issue 1 11/02 ãNokia Corporation
RH-9
System Module & UI
Page 65