CC2420-RTR1 datasheet(74/92 Pages) TI

74 / 92 page

CC2420

SWRS041B

Page 74 of 89

MANAND (0x21) - Manual signal AND override register

Bit

Field Name

Reset

R/W

Description

VGA_RESET_N

R/W

The VGA_RESET_N signal is used to reset the peak detectors in

the VGA in the RX chain.

BIAS_PD

R/W

Global bias power down (1)

BALUN_CTRL

R/W

The BALUN_CTRL signal controls whether the PA should

receive its required external biasing (1) or not (0) by controlling

the RX/TX output switch.

RXTX

R/W

RXTX signal: controls whether the LO buffers (0) or PA buffers

(1) should be used.

PRE_PD

R/W

Powerdown of prescaler.

PA_N_PD

R/W

Powerdown of PA (negative path).

PA_P_PD

R/W

Powerdown of PA (positive path). When PA_N_PD=1 and

PA_P_PD=1 the up-conversion mixers are in powerdown.

DAC_LPF_PD

R/W

Powerdown of TX DACs.

XOSC16M_PD

R/W

RXBPF_CAL_PD

R/W

Powerdown control of complex bandpass receive filter calibration

oscillator.

CHP_PD

R/W

Powerdown control of charge pump.

FS_PD

R/W

Powerdown control of VCO, I/Q generator, LO buffers.

ADC_PD

R/W

Powerdown control of the ADCs.

VGA_PD

R/W

Powerdown control of the VGA.

RXBPF_PD

R/W

Powerdown control of complex bandpass receive filter.

LNAMIX_PD

R/W

Powerdown control of LNA, down-conversion mixers and front-

end bias.

1 For some important signals the value used by analog and digital modules can be overridden manually. This is done

as follows for the hypothetical important signal IS:

IS_USED

= (IS * IS_AND_MASK) + IS_OR_MASK,

using boolean notation.

The AND-mask and OR-mask for the important signals listed resides in the MANAND and MANOR registers,

respectively.

Examples:

•

Writing 0xFFFE to MANAND and 0x0000 to MANOR will force LNAMIX_PD

≡0 whereas all other signals will be

unaffected.

•

Writing 0xFFFF to MANAND and 0x0001 to MANOR will force LNAMIX_PD

≡1 whereas all other signals will be

unaffected.

CC2420-RTR1 数据表(PDF) 74 Page - Texas Instruments

CC2420-RTR1 数据表(HTML) 74 Page - Texas Instruments

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