Figure 7-3. TX Power Ramping Example (O-QPSK 250kb/s Mode)
0
6
8
10
SLP_TR
State
PLL_ON
2
12
14
16
18
Length [μs]
4
PA
PA_LT
Modulation
BUSY_TX
TX Data
Using an external RF front-end, it may be required to adjust the start-up time of the external PA relative to the internal
building blocks to optimize the overall PSD. This can be achieved using the RF_CTRL_0.PA_LT bits.
For more details on actual TX power for each gain settings, see
.
Table 7-3. Recommended Mapping of TX Power, Frequency Band and PHY_TX_PWR (register 0x05).
PHY_TX_PWR (register 0x05)
TX Power Setting
915 MHz North American Band
PHY Modes: BPSK-40
(GC_TX_OFFS = 3), BPSK-40-
ALT (GC_TX_OFFS = 3),
OQPSK-SIN-{250, 500, 1000}
(GC_TX_OFFS = 2)
868.3 MHz European Band
PHY Modes: BPSK-20
(GC_TX_OFFS = 3),
OQPSK-SIN-RC-{100, 200,
400} (GC_TX_OFFS = 2)
OQPSK-RC-{100, 200, 400}
(GC_TX_OFFS = 3)
780 MHz Chinese Band
PHY Modes: OQPSK-RC-{250,
500, 1000} (GC_TX_OFFS = 2)
11
0xC0
0xA0
0xC1
10
0xC1
0x80
0xE3
9
0x80
0xE4
0xE4
8
0x82
0xE6
0xC5
7
0x83
0xE7
0xE7
6
0x84
0xE8
0xE8
5
0x40
0xE9
0xE9
4
0x86
0xEA
0xEA
3
0x00
0xCB
0xCB
2
0x01
0xCC
0xCC
1
0x02
0xCC
0xCD
0
0x03
0xAD
0xCE
-1
0x04
0x47
0xCF
-2
0x27
0x48
0xAF
-3
0x05
0x49
0x26
-4
0x07
0x29
0x27
-5
0x08
0x90
0x28
-6
0x91
0x91
0x29
-7
0x09
0x93
0x07
-8
0x0B
0x94
0x08
-9
0x0C
0x2F
0x09
ATSAMR30M18A
Module Description
©
2018-2021 Microchip Technology Inc.
and its subsidiaries
Datasheet
DS70005384B-page 22