User Guide

NPL-4/5
System Module and User Interface Nokia Customer Care
Page 46 Copyright © 2004 Nokia Corporation. All rights reserved. Issue 1 05/04
HW Block Diagram
Functionally NPL-4/5 electronic compass consists some main blocks.
Figure 15: Block Diagram
Not used functionality and features of MagIC ASIC on NPL-4/5 compass implementation.
•I
2
BUS (additional communication channel)
• UART (additional communication channel)
• z - channel A/D converter
HW block functions
Magnetometer sensor (2-axis)
• x and y direction magnetic field sensitivity sensors
-differential outputs to MagIC ASIC
• set/reset circuitry for
-compensating offset effect
i -improving performance and linearity
CBUSD
A
CBUSCLK
CBUSENX
CBUS IF
UPP
UEME
MagIC
ASIC
V
bridge
AVss
InXp
InXm
InYp
InYm
SROp
SROm
X
-Direction
Y
-Direction
SET/RESET
Circuit
MAGNETOMETER
I2CCL
K
I2CDA
GenIO
I2C inter-
Face
V
IO
CBUS
interfaces
Cl
k
UART inter-
face
PURX
GenIO03
also camera
ClrX
DV
DD
AV
DD
DCT 4
Engine
I2C
interface
100nF
10nF
AVss
DV
ss
SRVss
SRVdd
1uF
GND
V
B
Ext. power supply, also for other functions
VBAT
Offset
Circuit
GenIO01
Constant
current
source
VBAT
Reg_Ctrl