Μsd Card Interface; Camera Concept; Cameras; Main Camera Characteristics - Nokia n81 Service Manual

RM-179; RM-223
System Module and User Interface
The EM ASIC SIM1 interface supports both 1.8 V and 3.0 V SIM cards. The SIM interface voltage is first 1.8 V
when the SIM card is inserted, and if the card does not response to the ATR a 3 V interface voltage is used.
The data communication between the card and the phone is asynchronous half duplex, and the clock supplied
to the card is 1-5 MHz, which is 3.2 MHz by default (in GSM system). The data baud rate is the SIM card clock
frequency divided by 372 (by default), 64, 32 or 16.
µSD card interface
The µSD card is connected to the engine by an external level shifter with an ESD protection filter. Supplied
voltages:
• VSD: 2.85 V (from level shifter)
• VIO: 1.8 V (from AVILMA)
The µSD card door state is detected by a detect switch. When the door is open, the uSD card is powered off.
Hot swap is supported, which means that the card may be plugged in/out at any time, without removing the
battery.

Camera concept

Cameras

The device has two integrated digital cameras. The main camera is meant for high quality still imaging and
video capture. The secondary (front) camera is meant for video conferencing but it can also be used for still
image capture.

Main camera characteristics

Sensor type
Issue 1
Figure 59 SD interface
COMPANY CONFIDENTIAL
Copyright © 2007 Nokia. All rights reserved.
CMOS
Page 6 –19