PC IrDA interface

DIY IR interface

This circuit is also from www.electronics-lab.com. Since it is very hard for me to get the infrared interface (TFDU4100), I start to look in the old/damage handphones. It looks something like this.

Now, you need to remove it using the hot air blower perhaps.

Connecting to motherboard

Please refer to www.electronics-lab.com on how connect this irda module to your motherboard.

My IrDA

Infrared Transceiver Modules

Here are the pin layout and picture of the device.

Pin Description of TFDU4100

Pin Number	Function	Description	I/O	Active
1	IRED Anode	IRED anode, should be externally connected to VCC2 through a current control resistor
2	IRED Cathode	IRED cathode, internally connected to driver transistor
3	Txd	Transmit Data Input	1	High
4	Rxd	Received Data Output, open collector. No external pull–up or pull–down resistor is required (20 k. resistor internal to device). Pin is inactive during transmission.	0	Low
5	NC	Do not connect
6	VCC1/SD	Supply Voltage / Shutdown
7	SC	Sensitivity control	1	High
8	GND	Ground