CC2420-RTR1 datasheet(81/92 Pages) TI

81 / 92 page

CC2420

SWRS041B

Page 81 of 89

38 Test Output Signals

The two digital output pins CCA and SFD,

can be set up to output test signals

defined

IOCFG1.CCAMUX

and

IOCFG1.SFDMUX

. This is summarized in

Table 12 and Table 13 below.

CCAMUX

Signal output on CCA pin

Description

CCA

Normal operation

ADC_Q[0]

ADC, Q-branch, LSB used for random number generation

DEMOD_RESYNC_LATE

High one 16 MHz clock cycle each time the demodulator

resynchronises late

LOCK_STATUS

Lock status, same as FSCTRL.LOCK_STATUS

MOD_CHIPCLK

Chip rate clock signal during transmission

MOD_SERIAL_CLK

Bit rate clock signal during transmission

FFCTRL_FS_PD

Frequency synthesizer power down, active high

FFCTRL_ADC_PD

ADC power down, active high

FFCTRL_VGA_PD

VGA power down, active high

FFCTRL_RXBPF_PD

Receiver bandpass filter power down, active high

FFCTRL_LNAMIX_PD

Receiver LNA / Mixer power down, active high

FFCTRL_PA_P_PD

Power amplifier power down, active high

AGC_UPDATE

High one 16 MHz clock cycle each time the AGC updates its gain

setting

VGA_PEAK_DET[1]

VGA Peak detector, gain stage 1

VGA_PEAK_DET[3]

VGA Peak detector, gain stage 3

AGC_LNAMIX_GAINMODE[1]

RF receiver front-end gain mode, bit 1

AGC_VGA_GAIN[1]

VGA gain setting, bit 1

VGA_RESET_N

VGA peak-detector reset sign, active low.

Reserved

CLK_8M

8 MHz clock signal output

XOSC16M_STABLE

16 MHz crystal oscillator stabilised, same as the status bit in Table

FSDIG_FREF

Frequency synthesizer, 4 MHz reference signal

FSDIG_FPLL

Frequency synthesizer, 4 MHz divided signal

FSDIG_LOCK_WINDOW

Frequency synthesizer, lock window

WINDOW_SYNC

Frequency synthesizer, synchronized lock window

CLK_ADC

ADC clock signal 1

ZERO

Low

ONE

High

Table 12. CCA test signal select table

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