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TRC104

2.4 GHz RF Transceiver

RF Monolithics, Inc 

5 Data Transfer Modes

The TRC104 supports two data transfer modes - Continuous Data Mode and Burst Data Mode. The data transfer

mode is selected by the D_Mode bit in configuration register 0x02.

5.1 Continuous Data Mode

Continuous Data Mode is selected when the D_Mode bit of register 0x02 is set to 0. Continuous Receive Mode

routes demodulated data directly to the SDAT pin and the associated clock to the SCLK pin. In Continuous

transmit mode the data bit stream is applied directly to the SDAT pin. The internal FIFOs and the automatic

packet features are disabled in Continuous Data Mode. It is the responsibility of the TRC104 host microcontroller

to handle these functions.

5.1.1 Continuous Transmit Mode

Continuous Transmit Mode is enabled when the C_Mode bit of register 0x00 is set to 1 and the D_Mode bit of

register 0x02 is set to 0. In Continuous Transmit Mode, the transmit FIFO and all automatic packet features

including preamble generation, addressing, DC-balanced data scrambling and CRC generation are disabled. The

TRC104 host microcontroller must handle these functions for Continuous Transmit Mode. Specifically, the host

microcontroller must generate a 1-0-1-0 … preamble sequence of at least 16 bits followed immediately by the

destination address for the transmission (called the sender or local device address at the destination node).

Also for this mode, it is the responsibility of the host microcontroller to maintain correct bit timing to an accuracy of

1% as there is no bit clock output for transmit timing. The host microcontroller must be powerful enough to

accurately support the selected serial data rate (250 kb/s or 1 Mb/s) in addition to other functions required for the

end application. Figure 11and Table 10 show the timing for transmitting data on SDAT. Note that three 1 dummy

bits must be sent prior to sending the preamble and the rest of the packet.

C o n tin u o u s M o d e T r a n s m it T im in g

M ODE

SDAT

T3

T1

T2

D um m y D um m y D um m y

P r e a m b le /A d d r e s s /D a ta B its

Figure 11

Item Description

Min Typ Max Unit

T1 MODE to 1st Bit Time

250

µs

T2 Dummy Bits

3

bit

T3 RF Transmission Time

4 ms

Table 10

The TRC104 should not be active for more than 4 ms at a time to allow for internal auto-calibration. Typical

calibration time is 200 µs.

5.1.2 Continuous Receive Mode

Continuous Receive Mode is enabled when the C_Mode bit of register 0x00 is set to 0 and the D_Mode bit of

register 0x02 is set to 0. In Continuous Receive Mode, the receive FIFO and automatic packet features except

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Page 14 of 33

TRC104 - 08/13/09

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