WI.M900T Radiotronix, WI.M900T Datasheet - Page 10

• Manufacturer Part Number: WI.M900T
• Description: RF Modules & Development Tools TRANSMIT ONLY VERS. OF WI.232DTS MODULE
• Manufacturer: Radiotronix

Specifications of WI.M900T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: WIM900T

Preliminary
transmit mode. The data input could be either DATA or DATAIN, depending on how the
module is programmed.
Figure 2 shows a typical connection between the module and a host microcontroller SPI
port. In this configuration, the DATA pin is programmed to be a data output in receive
mode and a data output in receive mode. In receive mode, the microcontroller SPI port
is configured as an SPI slave. The module generates data timing. In transmit mode, the
microcontroller SPI port is configured as a SPI master. Timing is generated by the
microcontroller.
Figure 2
The transmit chain is essentially a VCO locked to a crystal reference frequency by a
fractional N synthesizer. The synthesizer allows the VCO frequency to be set in 500 Hz
steps. It also supports direct digital FSK modulation of the transmit carrier. Frequency
deviation can be set from 0 to 255kHz in 1kHz steps.
The output of the VCO is amplified by the power amp, which can be set to one of four
output power levels.
For detailed information about programming the Wi.M900X/T module, please consult the
current XE1203E(F) data sheet which can be found at www.xemics.com.
Programming Interface
The serial programming interface is compatible with any hardware or software
implementation of a SPI serial port.
The following code example shows functions for reading and writing module registers
using a software SPI implementation. The XE_SCLK, XE_SI, XE_SO, XE_EN
definitions are hardware specific and correspond to the microcontroller IO pins that are
connected to the XE1203 SPI pins.
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www.radiotronix.com
DCLK
DATA
6
7
SCLK
MOSI
Revision A
Preliminary
10