Nokia 5140 Manuales De Servicio
NPL-4/5
System Module and User Interface
Nokia Customer Care
Page 56
Copyright © 2004 Nokia Corporation. All rights reserved.
Issue 1 05/04
MagIC - magnetometer sensor interface for constant current driver
Table 27: Offset strap supply interface
Power supplies
Introduction
The MagIC ASIC has two separate voltage supplies. DVDD is supplying digital functions
and AVDD analogue functions. The digital supply is capable of running at a voltage of
1.8V for compatibility with the BB I/O levels.
and AVDD analogue functions. The digital supply is capable of running at a voltage of
1.8V for compatibility with the BB I/O levels.
After the phone is started, the DVDD voltage is always on, since it is supplied from VIO
regulator.
regulator.
AVDD can be off or on at power up depending which regulator is used for it.
Using VIO for DV
DD
supply
VIO is available on UEME. The digital supply is capable of running at a voltage of 1.8V for
compatibility with the BB I/O levels.
compatibility with the BB I/O levels.
Using external regulator for AVDD
External AVDD regulation voltage level is 2.8V
The analogue supply is fed from the external regulator whose output is enabled by the
GenIa signal.
GenIa signal.
Pad
Pin Name
Pin Type
Pad
Pin Name
Connection
Function
D8
RegCtrl
(MagIC)
(MagIC)
Digital
output
output
for magnetometer offset strap constant
current driver
current driver
On/off control
Current
output
output
Ioff+
to magnetometer sensor offset strap
Offset strap current,
positive
positive
Current
input
input
Ioff-
Offset strap return current (-) from
magnetometer offset strap
magnetometer offset strap
Offset strap current,
negative
negative
GND
Power
supply
supply
GND
VBAT
Power
supply
supply
Power supply for constant current
driver
driver
Power supply from
battery
battery