CC2430 Datasheet, PDF (171/212 Pages) Texas Instruments – A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee-TM

CC2430
Radio : Transmitter Test Modes
14.30 Transmitter Test Modes
CC2430 can be set into different transmit test
modes for performance evaluation. The test
mode descriptions in the following sections
requires that the chip is first reset, the crystal
14.30.1 Unmodulated carrier
An unmodulated carrier may be transmitted by
setting MDMCTRL1L.TX_MODE to 2, writing
0x1800 to the DACTSTH:DACTSTL registers
and issue a STXON command strobe. The
transmitter is then enabled while the
oscillator is selected using the CLKCON
register and that the crystal oscillator has
stabilized.
transmitter I/Q DACs are overridden to static
values. An un-modulated carrier will then be
available on the RF output pins.
A plot of the single carrier output spectrum
from CC2430 is shown in Figure 48 below.
Figure 48: Single carrier output
14.30.2 Modulated spectrum
The CC2430 has a built-in test pattern
generator that can generate a pseudo random
sequence using the CRC generator. This is
enabled by setting MDMCTRL1L.TX_MODE to 3
and issuing a STXON command strobe. The
modulated spectrum is then available on the
RF pins. The low byte of the CRC word is
transmitted and the CRC is updated with 0xFF
for each new byte. The length of the
transmitted data sequence is 65535 bits. The
transmitted data-sequence is then:
[synchronization header] [0x00, 0x78, 0xb8,
0x4b, 0x99, 0xc3, 0xe9, …]
Since a synchronization header (preamble and
SFD) is transmitted in all TX modes, this test
mode may also be used to transmit a known
CC2430 Data Sheet (rev. 2.1) SWRS036F
Page 171 of 211