CC1020-RTR1 datasheet(56/95 Pages) TI1

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XOR

Tx out (modulating signal)

Tx data (DIO pin)

XOR

Rx pseudo random sequence

Rx in (Demodulated Rx data)

Rx out (DIO pin)

Tx pseudo random sequence

CC1020

SWRS046H – NOVEMBER 2006 – REVISED MARCH 2015

www.ti.com

Table 5-15. Crystal Oscillator Component Values

ITEM

CL = 12 pF

CL = 16 pF

CL = 22 pF

6.8 pF

15 pF

27 pF

6.8 pF

15 pF

27 pF

5.17 Built-in Test Pattern Generator

The CC1020 has a built-in test pattern generator that generates a PN9 pseudo random sequence. The

PN9_ENABLE bit in the MODEM register enables the PN9 generator. A transition on the DIO pin is

required after enabling the PN9 pseudo random sequence.

The PN9 pseudo random sequence is defined by the polynomial x9 + x5 + 1.

The PN9 sequence is ‘XOR’ed with the DIO signal in both TX and RX mode as shown in Figure 5-31.

Hence, by transmitting only zeros (DIO = 0), the BER (Bit Error Rate) can be tested by counting the

number of received ones. Note that the 9 first received bits should be discarded in this case. Also note

that one bit error will generate 3 received ones.

Transmitting only ones (DIO = 1), the BER can be tested by counting the number of received zeroes.

The PN9 generator can also be used for transmission of ‘real-life’ data when measuring narrowband ACP

(Adjacent Channel Power), modulation bandwidth or occupied bandwidth.

Figure 5-31. PN9 Pseudo-random Sequence Generator in TX and RX Mode

5.18 Interrupt on Pin DCLK

5.18.1 Interrupt Upon PLL Lock

In synchronous mode the DCLK pin on CC1020 can be used to give an interrupt signal to wake the

microcontroller when the PLL is locked.

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