semtech xm1203f 433MHz. help please!

I am trying to connect the transceiver to a uart module. the problem is that i don't understand why the tx and rx pins of the transceiver are both input pins. furthermore, i don't understand the difference between the data pin and the datain pin. please help.

There isn't much information on that data brief, you really need the full data sheet.

I'm guessing:
While transmitting, the signal on pin 17 is probably a copy of that on pin 19, when receiving, it is probably just the receive data.

This isn't a simple module you have to supply an SPI like interface to set it up and control signals for the antenna switching as well as the data stream you are transferring.

Brian.

the problem is i can't find the full data sheet nor it was given with the transceiver package. the only available datasheet was for the xe1203, which was used in the xm1203 module.

the application note is my basis. i am using a uart module but the transceivers are not responding even with the settings indicated.

I think you might have to contact the manufacturer for more information. It isn't clear which interface is carrying data and which is carrying configuration/status.

The UARt might only be able to use the configuration and status stream. It that is the case, you have to use the recovered clock output to sync the data bits and a UART may not work.

Brian.

The answers to your questions are:

1. TX and RX Pins are used to switch the antenna to the RF TX output and RF TX input of the device. So TX is high (and RX low) when you are in transmit mode and viceversa in Rx mode.

2. Data and Datain are separated if you need to have separated lines for TX and RX data. If you can use the same pin for TX and RX data, just use Data pin and discard the other one.

I hope it can help.

Mazz