User Guide

Figure 64 Clocking scheme

IrDA

IrDA specifies a low-cost, reliable, fully digital peer-to-peer data link between IrDA units at data rates from

9600 bits/s to 115 kbit/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 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

neighbourhood.

Baud rates in the range 9600 bit/s to 115 kbit/s are known as SIR (Slow IR); this data is sent asynchronously.

The protocol and speed are only changed after successful negotiation. IrDA connectivity includes IrCOMM,

IrOBEX, IrTran-P, IrMC and PhoNet.

IR communication is half-duplex e.g. the IR receiver sees its own transmission, and the IR interface is either

transmitting or receiving, but not both at once. IrDa modules consume current when the IR detector is active

and therefore modules have to be set to the shutdown mode (SD-mode).

USB

USB (Universal Serial Bus) provides a wired connectivity between a USB host PC and peripheral devices.

USB is a differential serial bus for USB devices. USB controller supports USB specification revision 2.0 with full

speed USB (12 Mbps). The device is connected to the USB host through the system connector. The USB bus is

hot plugged capable, which means that USB devices may be plugged in/out at any time.

Hall sensor

HALL sensor is used to monitor the position of the upper block in slide construction.

The function of a Hall sensor is based on the physical principle of the Hall effect. Hall voltage is generated

over sensor when magnetic field traverses the sensor.

There is an integrated comparator and switches in Hall switches. When sensor is in magnetic field, switch is

closed and output is connected to GND.

RM-208

System Module Nokia Customer Care

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