The Infrared Wireless Expert
ACT-IR8250P
Specification
4.5 Operating modes
When nEnable is high, ACT IR8250P drives IR_SD high (to shutdown the IR transceiver) and puts
itself to sleep. In this sleep state, it can be awaken only by nEnable going low.
When nEnable is low, ACT IR8250P drives IR_SD low (to power up the IR transceiver) and puts itself
to sleep. In this sleep state, it can be awaken by any incoming IR signal. Once awaken, it will either
actively communicate with an IrDA Primary device (PC, PDA, Cell phone, etc.), or go back to sleep if
no IrDA Primary is there.
5. IrDA Protocols Supported
The following figure is the block diagram of ACT-IR8250P protocols architecture. The red colored
blocks represent different optional upper layers. Only one of the red colored blocks can be included
at a time.
IrLMP and IAS
IrLAP
IrLPT or IrCOMM 3-wire raw
IrCOMM 9-wire
Host Interface
IrPHY
Host Interface
ACT-IR8250P
TinyTP
OBEX Transport
IrDA Transceiver
IrSocket
Host
© Copyright 2003-2005 ACTiSYS Corp. Page 10 of 25
Jan 28, 2005
Rev. 0.44
