RTX-24EM
User guide
The technical characteristics can change without notice. AUR°EL S.p.A doesn’t assume the responsibility to the damages caused by an improper use of the device.
AUR°EL S.p.A.
Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY 12/11/2019 - Rev. B
Tel.: +390546941124 – Fax: +390546941660 Page 23
http://www.aurel.it
9.8
TX Power level
The PA output power can be adjusted to many different levels from -20dBm to +10 dBm.
Table 10 shows 7 typical levels with optimum efficiency.
These levels are set by
I_Pre_PA[4:0]
and
I_PA[4:0]
register bits.
Typical current consumption for each of these power levels is also shown.
RTX-24EM-AI/H and
RTX-24EM-AI/V
RTX-24EM-AE/H and
RTX-24EM-AE/V
Power
Level
I_Pre_PA
[4:0]
I_PA
[4:0]
E.R.P. RF
Power
(dBm)
Current
consumption
(mA)
RF Output
Power on UFL
connector
(dBm)
Current
consumption
(mA)
7
29
18
+8.5
36
+10
36
6
21
5
+7.5
30
+9
30
5
10
2
+4.5
21
+6
21
4
7
1
+1.2
14
+2.5
14
3
4
1
-2.5
11
-1
11
2
3
1
-4.5
10
-3
10
1
1
1
-11.5
8
-10
8
Table 10: TX power level
Note 1
: the European standard EN 300 440 allows maximum +10dBm RF radiated power. This means that, to be
compliant with the standard, the device with external antenna requires a 0dB antenna maximum gain for the power level
7, a 1dB antenna maximum gain for power level 6, a 4dB antenna maximum gain for power level 5 and so on.
Note 2
: for the version with external antenna the current consumption is measured with 50 ohm load connected to
UFL connector. Connecting an antenna the current consumption may be different.
9.9
Packet (TX and RX) payload
9.9.1 Mode payload size in the header
In this mode (defined by the SPI Command
ROM_Boot
with argument
ROM_Boot_Address
=
256
for HS
Mode or
320
for NS Mode), the transmit payload can be up to 31 bytes. A header byte which defines the
packet size is added (See Section 13). The payload (and header) are read and written through the SPI
command
Read_RXFIFO
and
Write_TXFIFO
.
9.9.2 Mode payload size in RAM2
In this mode (defined by the SPI Command
ROM_Boot
with argument
ROM_Boot_Address
=
128
for HS
Mode or
192
for NS Mode), the transmit payload can be up to 32 bytes, but the first byte following the
Address byte has to be different from
Address[7:0]
. Payload size is defined in the register
N_Pay[4:0]
