User Guide

CCS Technical Documentation System Module LG4 and Grip Module LS4
Issue 2 11/02 ¤Nokia Corporation Page 21
NHL-2NA BB Features & HW interfaces
NHL-2NA BB User interface
UI-Module Interface
Interface is for Color Display 176 x 208 (X3) resolution and backlight is white LED with
lightguide. Also Part of Keyboard is locating in module with Navigation Key. Display is
connected to LG4 by 30-pin Board-to-Board connector. Interface includes also power
rails for UI and Backlight. Interface uses GPIO pins of UPP_WD2.
Power Key
PWROnx of UEM is pulled up to battery voltage by a current source inside UEM. Pressing
PWR-Key connects UEM PWRONX-pin to ground via resistor. The power key has also a
reset function: while removing battery is difficult, a reset can be accomplished by press-
ing this key for longer time. Power key is connected to main PWB via spring contacts.
Grip Interface
Grip Interface includes Matrix Keyboard & Backlight, Battery interface, Vibra Interface,
Charger interface, Current Gauge interface.
Hall Sensor and Magnet
NHL-2NA is using Hall sensor TLE 4917 (NMP code 4341087) and magnet to find out the
open/close position of the grip. The hall sensor component is in the LG4 BB area and the
magnet is in the grip module. See locations of the sensor and magnet below, figure 9.
Figure 9: Locations of the sensor and magnet
As the grip is closed, the hall sensor and magnet are against each other. At this position
the output of the hall sensor is high. As the grip is open and sensor and magnet are sep-
arated, the output is low. This low level gives the information to processor that grip is
open.
Sensor needs 2.7V for operation and that's why Vflash1 voltage is needed to be con-
nected to Vs pin. PRG pin is needed to be connected GND that output is zero as magnet
and sensor are separated. See Principle of the connection of the hall sensor below.
Hall sensor
Transceiver
LG4
Magnet
Grip
LS4