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AUREL RTX-24EM User Manual

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Contents
1.
General description ..................................................................................................................... 3
1.1
Features ..................................................................................................................................... 3
2.
RTX-24EM pin out ........................................................................................................................... 4
3.
Reference Documentation .............................................................................................................. 5
4.
European Reference Standards ....................................................................................................... 5
5.
Overview ........................................................................................................................................ 5
5.1
RF transceiver ............................................................................................................................. 6
5.1.1
Frequency synthesizer / Phase-Locked Loop (PLL) ..................................................................... 6
5.1.2
Receiver .................................................................................................................................. 6
5.1.3
Transmitter ............................................................................................................................. 6
6.
Electrical characteristics .................................................................................................................. 9
6.1
General Operating Conditions ..................................................................................................... 9
6.2
Supply currents on Vcc ................................................................................................................ 9
6.3
RF characteristics ...................................................................................................................... 10
7.
Functional modes ......................................................................................................................... 11
7.1
Power Down ............................................................................................................................. 12
7.2
Standby Mode .......................................................................................................................... 12
7.3
RAM2 Init ................................................................................................................................. 12
7.4
Auto-cal .................................................................................................................................... 12
7.5
Transmit ................................................................................................................................... 12
7.6
Receive ..................................................................................................................................... 12
8.
Digital interface ............................................................................................................................ 13
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
Tel.: +390546941124 - Fax: +390546941660
http://www.aurel.it
RTX-24EM
User guide
12/11/2019 - Rev. B
Page 1

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  • Page 1: Table Of Contents

    RTX-24EM User guide Contents General description ........................3 Features ............................. 3 RTX-24EM pin out ........................... 4 Reference Documentation ......................5 European Reference Standards ....................... 5 Overview ............................5 RF transceiver ..........................6 5.1.1 Frequency synthesizer / Phase-Locked Loop (PLL) ..............6 5.1.2...
  • Page 2 RTX-24EM User guide SPI operations ........................... 13 SPI Commands .......................... 15 Programming interface ......................... 19 RAM2, RAM1 reset ........................19 RAM2 Initialization ........................19 Internal PTAT current auto calibration ..................19 VCO auto calibration ......................... 20 Channel Data Rate ........................21 9.5.1...

  • Page 3: General Description

    The EM9209 provides two communication modes with normal sensitivity (NS) or high sensitivity (HS) and programmable bit rate from 1.5kbps to 72kbps. The RTX-24EM module is pin to pin compatible with Aurel previous models XTR CYP 2.4 GHz, XTR VF 2.4 LP, XTR VF 2.4PA-LNA and XTR VF 2.4 HP.

  • Page 4: Rtx-24Em Pin Out

    XTR CYP 2.4 GHz and XTR VF 2.4 Aurel modules. They are used for the same functionality (force the both XTR CYP 2.4 GHz and XTR VF 2.4 Aurel modules. They are used for the same functionality (force the RTX-24EM in power down mode) and they are both connected to EN_REG pin of EM9209 radio SoC.

  • Page 5: Reference Documentation

    European Reference Standards The module RTX-24EM complies with the European standards EN 300 440 and EN 301 489-3 with maximum power supply of 3.6V. The transceiver must be supplied by a very low voltage safety source protected against short circuits.

  • Page 6: Rf Transceiver

    RTX-24EM User guide RF transceiver The highly integrated multi-channel RF transceiver is ideal for wireless applications in the world-wide, license-free, ISM frequency band at 2.4000GHz to 2.4835GHz. Its robust low-IF architecture and direct FSK modulation scheme are designed for proprietary communication protocols. The EM9209 supports data transmission rates of 1.5kbps to 72kbps for up to 20 channels.
  • Page 7 RTX-24EM User guide Digital interface The Digital Interface is shown in Figure 2. It includes: The Digital Interface is shown in Figure 2. It includes: • A four pin Serial Peripheral Interface (SPI). Serial Peripheral Interface (SPI). • A Custom microcontroller with built in CODEC, FIFO ontroller with built in CODEC, FIFO’s and timers.
  • Page 8 RTX-24EM User guide 5.2.1.1 In Communication mode: The TXFIFO can be written at any time by the host microcontroller. When the SPI command Send_TXFIFO is activated, the internal microcontroller will transmit all the content of the TXFIFO (or, depending on the subroutine used, a predefined number of bytes, stored in RAM2) on the selected channel at the selected data rate.

  • Page 9: Electrical Characteristics

    RTX-24EM User guide Electrical characteristics General Operating Conditions Parameters Symbol Unit Supply Voltage Temperature Range °C Table 2: General Operating condition Supply currents on Vcc Operating Notes Symbol Conditions Unit Mode ENABLE (Pin 10) or nRESET (Pin 4) = 0 µA...

  • Page 10: Rf Characteristics

    Power level = 6 RF Output power on UFL Power level = 5 connector Power level = 4 +2.5 RTX-24EM-AE/H and RTX- 24EM-AE/V versions) Power level = 3 Power level = 2 Power level = 1 Power level = 7 +8.5...

  • Page 11: Functional Modes

    Functional modes This section describes the operational modes of the RTX operational modes of the RTX-24EM module. An example state diagram is give . An example state diagram is given in Figure 3, and each mode is described below. The SPI interface is described below.

  • Page 12: Power Down

    < 1uA. Standby Mode When ENABLE (Pin 10) or nRESET (Pin 4) is high the RTX-24EM wakes up in standby mode at about t PD-STBY seconds (see Table 6). The SPI register memory is then set to 0 and the SPI waits for the host programming.

  • Page 13: Digital Interface

    The RTX-24EM has a programmable interrupt pin (IRQ). All internal enables signals and parameters of the RTX-24EM are mapped in a small 16x12 bits memory called RAM2. RAM2 can directly be accessed through SPI and no crystal clock is required.
  • Page 14 RTX-24EM User guide problems using an 8-bit wide SPI interface. Each change to MOSI is latched on the rising edge of SCK, and each change to MISO is available on the falling edge of SCK. A timing diagram is shown in Figure 2.

  • Page 15: Spi Commands

    RTX-24EM User guide • Status[1] reflects the inactivity of the crystal oscillator (0: running). • Status[0] shows the unlock state of the 2.4GHz LO frequency synthesizer (0: main LO PLL locked). For connect transmission operation, status[2..0] must be equal to ‘000’.
  • Page 16 RTX-24EM User guide Read_RXFIFO_Size This command reads the total number of bytes currently available in the RXFIFO. Read_TXFIFO_Size This command reads the total number of bytes currently available in the TXFIFO. Read_RAM1 This command reads the 12 bits word from the specified address (6bits) of RAM1. This command will put the microcontroller on hold and reset state, until last bit has been processed.
  • Page 17 RTX-24EM User guide Reset_Micro This instruction allows an asynchronous reset of the microcontroller. Never use this command when the micro is running (RAM2 and FIFO’s content could be corrupted). Always first stop the micro using SPI command Stop_Micro prior to use Reset_Micro.
  • Page 18 RTX-24EM User guide ROM_Boot This command copies the 64 12 bits instructions from the specified ROM address to RAM1. This allows for fast initialization of the microcontroller subroutines. The crystal oscillator must be enabled to perform this operation. Additionally, ROM_Boot command stops and resets the microcontroller.

  • Page 19: Programming Interface

    RTX-24EM User guide Programming interface This section describes how to program the RTX-24EM by writing to the EM9209 RAM2 or by booting and running in ROM stored subroutines. RAM2, RAM1 reset The EM9209 automatically performs a power on reset to RAM1 and RAM2 after ENABLE (Pin 10) or nRESET (Pin 4) is set to Vcc from GND.

  • Page 20: Vco Auto Calibration

    RTX-24EM User guide The calibration of the PTAT is independent of the temperature and only needs to be executed once when the chip is powered. Because this value should be constant during product life, it is possible to do calibration only once and to store RAM2@5<3:0> value somewhere in a non-volatile memory.

  • Page 21: Channel Data Rate

    RTX-24EM User guide Channel Data Rate The EM9209 has a programmable channel data rate of 1.5kbps to 72kbps for transmission and reception in normal sensitivity mode. The channel data rate is set by R_Bit_Clk[8:0] (RAM2@12[8:0]) and Ch_Rate[2:0] (RAM2@12[11:9]) as shown in Table 8. The complete typical values RAM2@12[11:0] is also reported.

  • Page 22: Rf Operating Frequency

    To establish a communication, both linked devices must be set to the same channel. The host microcontroller can program a channel change, which is validated when SPI signal SS goes down. Channel spacing of 4 MHz is recommended to limit interference with other RTX-24EM devices operating on adjacent channels.

  • Page 23: 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-AE/H and RTX-24EM-AI/V RTX-24EM-AE/V...

  • Page 24: Register Txfifo And Rxfifo

    RTX-24EM User guide (RAM2@14[4:0]). The payload is read and written through the SPI command Read_RXFIFO and Write_TXFIFO. 9.10 Register TXFIFO and RXFIFO The EM9209 has two 32 Bytes FIFO’s (TXFIFO and RXFIFO). The transmit TXFIFO can be accessed through the SPI command Write_TXFIFO. The receive RXFIFO can be accessed through the SPI command Read_RXFIFO.

  • Page 25: Frequency Error Register : Dft_Mes[7:0]

    This section describes the entire flow for transmitting RF data, in mode payload size in the header, starting from the RTX-24EM in power down mode (ENABLE (Pin 10) or nRESET (Pin 4) = GND). 1. Start the RTX-24EM by setting ENABLE (Pin 10) or nRESET (Pin 4) to Vcc.

  • Page 26: Transmission Flow, Mode Payload Size Defined In Ram2

    At the end of the transmission the RTX-24EM goes to reception mode therefore, if low power consumption is required, it will be necessary to set ENABLE (Pin 10) or nRESET (Pin 4) to GND to force the RTX-24EM in power down mode. The next packet transmission requires to execute all steps from 1 to 27.

  • Page 27: Reception Programming Flow

    21. Send the SPI command ROM_Boot with ROM_Boot_Address = 256 for High sensitivity mode or 320 for Normal sensitivity mode. 22. Send the SPI command Start_Micro: the RTX-24EM will wait an incoming RF packet and store the number of byte stored in the header in the RXFIFO (including the header).

  • Page 28: Reception Flow, Mode Payload Size Defined In Ram2

    This section describes the entire flow for receiving RF data, in mode payload size defined in RAM2, starting from the RTX-24EM in power down mode (ENABLE (Pin 10) or nRESET (Pin 4) = GND). The steps are the same as described in section 11.1 excepted: •...

  • Page 29: Ram2 Registers

    User guide RAM2 Registers In this section are shown all the most relevant RAM2 Register in order to properly configure the RTX-24EM. Any register not specifically mentioned here is reserved and its contents must be set according to defined Default value.
  • Page 30 RTX-24EM User guide RAM2[11:0]@ Address 2 Default Reset Description Value Value Reserved Reserved Reserved Reserved Reserved Reserved Reserved. Reserved Reserved Reserved Reserved Reserved Reserved RAM2[11:0]@ Address 3 Default Reset Description Value Value Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved...
  • Page 31 RTX-24EM User guide RAM2[11:0]@ Address 4 Default Reset Description Value Value I_Pre_PA[4] I_Pre_PA[3] Current bias of the PA preamplifier. Defines RF output I_Pre_PA[2] power in Transmit mode. I_Pre_PA[1] I_Pre_PA[0] Reserved Reserved Reserved Reserved Reserved. Reserved Reserved Reserved RAM2[11:0]@ Address 5...
  • Page 32 RTX-24EM User guide RAM2[11:0]@ Address 6 Default Reset Description Value Value I_PA[4] I_PA[3] I_PA[2] Current bias of the PA. Defines RF output in Transmit mode. I_PA[1] I_PA[0] Reserved Reserved Reserved Reserved Reserved. Reserved Reserved Reserved RAM2[11:0]@ Address 7 Default Reset...
  • Page 33 RTX-24EM User guide RAM2[11:0]@ Address 8 Default Reset Description Value Value Reserved Reserved Reserved Reserved. Reserved Reserved Reserved RB_Inst_Dis ROMboot Instruction Disable. Reserved Reserved. Limit_RSSI[3] Limit_RSSI[2] RSSI value. Limit_RSSI[1] Limit_RSSI[0] RAM2[11:0]@ Address 9 Default Reset Description Value Value Reserved Reserved Reserved.
  • Page 34 RTX-24EM User guide RAM2[11:0]@ Address 10 Default Reset Description Value Value Reserved Reserved Reserved Reserved Reserved Reserved Reserved. Reserved Reserved Reserved Reserved Reserved Reserved RAM2[11:0]@ Address 11 Default Reset Description Value Value Reserved Reserved Reserved Reserved Reserved Reserved Reserved. Reserved...
  • Page 35 RTX-24EM User guide RAM2[11:0]@ Address 12 Default Reset Description Value Value Ch_Rate[2] Ch_Rate[1] Bandwidth of the normal sensitivity demodulator. Ch_Rate[0] R_Bit_Ck[8] R_Bit_Ck[7] R_Bit_Ck[6] R_Bit_Ck[5] R_Bit_Ck[4] CODEC Bit clock frequency. R_Bit_Ck[3] R_Bit_Ck[2] R_Bit_Ck[1] R_Bit_Ck[0] RAM2[11:0]@ Address 13 Default Reset Description Value...
  • Page 36 RTX-24EM User guide RAM2[11:0]@ Address 14 Default Reset Description Value Value Reserved Reserved. Reserved Frequ[4] Frequ[3] Frequ[2] Synthesizer's RF Frequency LSB's Frequ[1] Frequ[0] N_Pay[4] N_Pay[3] N_Pay[2] Payload size of the Packet: N_Pay + 1 N_Pay[1] N_Pay[0] RAM2[11:0]@ Address 15 Default...

  • Page 37: Rf Packet Format

    RTX-24EM User guide RF Packet format In normal sensitivity mode, each packet contains the following information: Preamble 3 * Address Byte Header Payload Packet information Length Description Preamble = 5 * '11001100' 5 byte Clock recovery and data-slicer initialization. 3 * Address Byte 3 byte This field consists of 3 Address byte Address[7:0].

  • Page 38: Revision History

    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.

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