MRF24XA_15 Datasheet, PDF (62/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
REGISTER 2-50: EXTPA (EXTERNAL POWER AMPLIFIER CONFIGURATION REGISTER)
ADDRESS 0x3D
R-0
R/W-0
R/W-0
R/W-00100
r
EXTPAP
PAEN
PA2TXMA<4:0>
bit 7
bit 0
Legend: R = Readable bit W = Writable bit
-n = Value at POR
‘1’ = Bit is set
r = Reserved
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6
bit 5
bit 4-0
Reserved: Maintain as ‘0’
EXTPAP: External Power Amplifier Polarity bit
1 = 3.3V turns Power Amplifier ON
0 = GND turns Power Amplifier ON
PAEN: External Power Amplifier Enable bit
This bit enables the PA pin to output the control signal for external Power Amplifier.
PA2TXMA<4:0>: External Power Amplifier Power-Up to Medium Access Configuration Field bits
Defines the time interval between turning on the external PA of the device and the start time of medium
access (start of the PHY-layer frame).
PA_TO_TXMA = The transient time of the external PA, in the following scenarios:
PAEN = 1, and the transmitter is turned on first. TX_TO_TXMA = PA_TO_TXMA + TX transient time.
PAEN = 1, but the TX and PA transients are NOT sequenced.
PA_TO_TXMA = The transient time of the PA + TX_TO_TXMA:
PAEN = 1, and the external power amplifier is turned on first (transients are sequenced).
Representation: 1 μs/1 LSB. No offset
REGISTER 2-51: EXTLNA (EXTERNAL LOW-NOISE AMPLIFIER CONFIGURATION REGISTER)
ADDRESS 0x3E
R-0
R/W-0
R/W-0
R/W-00100
r
EXTLNAP
LNAEN
LNADLY<4:0>
bit 7
bit 0
Legend: R = Readable bit W = Writable bit
-n = Value at POR
‘1’ = Bit is set
r = Reserved
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6
bit 5
bit 4-0
Reserved: Maintain as ‘0’
EXTLNAP: External Low Noise Amplifier Polarity bit
1 = 3.3V turns Low-Noise Amplifier ON
0 = GND turns Low-Noise Amplifier ON
LNAEN: External Low-Noise Power Amplifier Enable bit
This bit enables the LNA pin to output the control signal for external Low-Noise Amplifier.
LNADLY<4:0>: External Low-Noise Amplifier Power-Up Transient Delay Field bits
Defines the duration between the LNA is turned on and the reception is valid.
LNA and internal receiver are turned on together. The longer transient is awaited before input signal is
accepted as valid.
Representation: 1 μs/1 LSB. No offset.
DS70005023C-page 62
Preliminary
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