MRF24XA_15 Datasheet, PDF (235/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
REGISTER 9-34: 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 turning on the LNA and the time when the reception is valid.
LNA and receiver are turned on together. The longer transient is awaited before input signal is accepted
as valid.
Representation: 1 s/1 LSB. No offset.
TABLE 9-10: REGISTERS ASSOCIATED WITH EXTERNAL PA AND LNA
7
6
5
4
3
2
1
0
OPSTATUS
TX2TXMA
EXTPA
EXTLNA
r
MACOP<3:0>
r
r
EXTPAP PAEN
r
EXTLNAP LNAEN
RFOP<2:0>
TX2TXMA<4:0>
PA2TXMA<4:0>
LNADLY<4:0>
Legend: r = Reserved, read as ‘0’.
 2015 Microchip Technology Inc.
Preliminary
DS70005023C-page 235