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 38
http://www.aurel.it
The size of the received packet including header and payload (stored in
RXFIFO
) can be read with the SPI
command
Read_RXFIFO_Size
.
When
RXFIFO
has been completely read (until
RXFIFO_Size[4..0]
= 0) after the previous reception,
RXFIFO_Size[4..0]
of the current packet is then the total packet size including the header.
The header byte is treated like a standard payload byte and must be stored in the
TX_FIFO
before the
payload data prior to transmit the packet in any mode.
For each byte, the most-significant bit (MSB) is sent first.
14
Device usage
In order to obtain the performances described in the technical specifications and to comply with the
operating conditions which characterize the certification, the device must be mounted on a printed circuit
taking into account the following:
Voltage Supply
1. The module must be powered by a low voltage safety source protected against short circuits. Maximum
allowed voltage variations: 1.9÷3.6V.
2. Decoupling near the transmitter with a ceramic capacitor of at least 100 nF.
Ground
It must surround in the best possible way the welding area of the transceiver. The ground plane should be
made in the lower face and must not be present near the antenna integrated in order to avoid coupling.
Other components:
1. When mounting the module parallel to the PCB (RTX-24EM-AI/H) do not include tracks near integrated
antenna.
2. Keep the device away from all other components of the circuit (more than 5 mm)
3. Keep particularly far away and shielded all microprocessors and their clock circuits.
15
Revision History
Date
Description
Revision
25/02/2019
First Release
Preliminary
16/09/2019
Rev A
A
12/11/2019
Added some notes related to RF power and current consumption.
B
