Irda Interface; Sd Card Interface; Wlan Interface; Battery Interface - Nokia n80 User Manual

RM-91; RM-92
Nokia Customer Care System Module

IrDA interface

IrDA specifies a low-cost, reliable, fully digital peer-to-peer data link between IrDA units at data rates from
9600 bits/s to 4Mbits/s. The link is based on the serial transmission of data as pulses of infra red light at the
wave length of 870nm and angles of +-15degrees at the range 0 - 50 to 100 cm. Because of these restrictions
and the optical nature of the link, the transmission is not omnidirectional but focused and only reaches a
peer at a limited line-of-sight distance from the transmitter thus not disturbing any other units in the
neighborhood.

SD card interface

The SD card is supplied with 3V supply voltage. The detection of the SD card removal/insertion is done by a
switch in the card connector. Removing the SD card while writing to the card may corrupt data in the SD card.
The switch is directly connected to host and it gives an interrupt to the SW while the status of the switch is
changed. SW turns power off on the SD card by switching off the SD card and level-shifter power supply (VSD).
When the SD card connector switch status changes the card should be identified if card exists.

WLAN interface

A Wireless Local Area Network (WLAN) is a flexible data communication system in which a mobile user can
connect to a local area network through a wireless connection. A standard, which specifies the technologies
for WLAN, is called IEEE 802.11.

Battery interface

The battery interface supports a 3-pole battery interface. The interface consists of three connectors: VBAT,
BSI and GND.
The BSI line is used to recognize the battery capacity by a battery internal pull down resistor.
Figure 92 Battery pin order
Battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line, which
is located on the transceiver PWB, at a place where the phone temperature is most stable.
For service purposes, the device SW can be forced into local mode by using pull down resistors connected to
the BSI line.

Camera interfaces

Back camera interface

The back camera of the device uses a SMIA95 3.0 mega pixel module with macro mode producing pictures
with a resolution of up to 2048x1536.
The camera regulator N1470 powers the digital parts of the camera, and a VAUX power rail is used for
powering the analogue parts.
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