AUREL XTR-EM24-HPS-AI User Manual

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Contents

General description ..................................................................................................................... 3

Features ......................................................................................................................................... 3

2.1

RTX-EM24-HPS-AE: dimension and pin out ................................................................................. 4

2.2

RTX-EM24-HPS-AI: dimension and pin out................................................................................... 5

Footprints ....................................................................................................................................... 6

3.1

Packaging ................................................................................................................................... 6

3.2

Soldering profile ......................................................................................................................... 7

Reference Documentation .............................................................................................................. 8

European Reference Standards ....................................................................................................... 8

Overview ........................................................................................................................................ 8

6.1

RF transceiver ............................................................................................................................. 8

6.1.1

Frequency synthesizer / Phase-Locked Loop (PLL) ..................................................................... 9

6.1.2

Receiver .................................................................................................................................. 9

6.1.3

Transmitter ............................................................................................................................. 9

Electrical characteristics ................................................................................................................ 12

7.1

General Operating Conditions ................................................................................................... 12

7.2

Supply currents on Vcc .............................................................................................................. 12

7.3

RF characteristics ...................................................................................................................... 13

Functional modes ......................................................................................................................... 14

8.1

Power Down ............................................................................................................................. 14

8.2

Standby Mode .......................................................................................................................... 14

8.3

RAM2 Init ................................................................................................................................. 15

8.4

Auto-cal .................................................................................................................................... 15

8.5

Transmit ................................................................................................................................... 15

8.6

Receive ..................................................................................................................................... 15

SPI interface ................................................................................................................................. 16

9.1

SPI operations ........................................................................................................................... 16

9.2

SPI Commands .......................................................................................................................... 18

10.

Programming interface.............................................................................................................. 21

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

XTR-EM24-HPS-AI, XTR-EM24-HPS-AE

User guide

18/07/2023 - Rev. C

Page 1

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Summary of Contents for AUREL XTR-EM24-HPS-AI

Page 1 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide Contents General description ........................3 Features ............................3 RTX-EM24-HPS-AE: dimension and pin out ................. 4 RTX-EM24-HPS-AI: dimension and pin out................... 5 Footprints ............................6 Packaging ........................... 6 Soldering profile ......................... 7 Reference Documentation ......................8 European Reference Standards ....................... 8 Overview ............................
Page 2 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 10.1 RAM2, RAM1 reset ........................ 21 10.2 RAM2 Initialization ........................ 21 10.3 Internal PTAT current auto calibration ................... 22 10.4 VCO auto calibration ......................22 10.5 Channel Data Rate ......................... 23 10.5.1 Bit stuffing ........................... 23 10.6...
Page 3 (PA) and a Low Noise Amplifier (LNA) that allow to increase the RF output power and the sensitivity compared to the Aurel RTX-24EM modules. The EM9209’s built in custom low power microcontroller supports the proprietary wireless protocol links in the license free 2.4000GHz to 2.4835GHz ISM band.
Page 4 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 2.1 RTX-EM24-HPS-AE: dimension and pin out Pin 12 UFL conn: RF in/out Pin 1 Description GND connection. Interrupt output signal for external host microcontroller. GND connection. Enable Pin (active high). If this pin is forced to low level, the device is resetted and in power down ENABLE mode.
Page 5 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 2.2 RTX-EM24-HPS-AI: dimension and pin out Pin 12 Pin 1 Description GND connection. Interrupt output signal for external host microcontroller. GND connection. Enable Pin (active high). If this pin is forced to low level, the device is resetted and in power down ENABLE mode.
Page 6 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide Footprints These foot print are recommended for the host board in order to guarantee correct assembly of the module. Footprint RTX-24EM-HPS-AE Footprint RTX-24EM-HPS-AI 3.1 Packaging Tape and reel RTX-24EM-HPS-AI Tape and reel RTX-24EM-HPS-AE 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.
Page 7 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 3.2 Soldering profile Profile Feature Pb-Free Assembly Preheat/Soak Temperature Min (T 150 °C smin Temperature Max (T 200 °C smax Time (t ) from (T to T 60-140 seconds smin smax Ramp-up rate (T to T 2 °C/second max.
Page 8 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide Reference Documentation All the modules embeds the EM Microelectronic EM9209 Radio SOC device. For information on technical details of the Radio SOC such as register settings, timing, application interfaces and clocking refer to the device data sheet available on the website: http://www.emmicroelectronic.com...
Page 9 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide Transmit mode: the entire transmit-chain is active and the digital baseband data can be up-converted to a 2.4GHz FSK modulated signal. Receive mode: the frequency synthesizer and the entire receive-chain are active and ready to receive a packet.
Page 10 XTR-EM24-HPS-AI, XTR AI, XTR-EM24-HPS-AE User guide The SPI can operate at up to 10MHz for reading and writing to the configuration ( The SPI can operate at up to 10MHz for reading and writing to the configuration ( The SPI can operate at up to 10MHz for reading and writing to the configuration (RAM2) and program (RAM1) memories.
Page 11 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide the RXFIFO (or, depending on the subroutine used, a predefined number of bytes, stored in RAM2) and sets the IRQ signal Pin high. The EM9209 RXFIFO and RXFIFO_Size can be read through SPI. The IRQ bit can be reset through the SPI Clear_IRQ command.
Page 12 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE 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 Power Down ENABLE (Pin 4) = 0 µA...
Page 13 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide RF characteristics Parameter Conditions Notes Symbol Unit General RF conditions Operating frequency 2400 2484 Modulation HS 1.5 kbps HS 3 kbps HS 6 kbps Data rate HS 12 kbps NS 24 kbps NS 48 kbps NS 72...
Page 14 XTR-EM24-HPS-AI, XTR AI, XTR-EM24-HPS-AE User guide Functional modes This section describes the operational modes of the operational modes of the RTX-24EM-HPS modules. An example state diagram is . An example state diagram is given in Figure 3, and each mode is n in Figure 3, and each mode is described below.
Page 15 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide mode all internal circuits are disabled and can be accessed, including the crystal oscillator. The host microcontroller can program the RTX-24EM-HPS-Ax for any operational mode. RAM2 Init The RTX-24EM-HPS-Ax can be configured using a 16 registers memory RAM2. RAM2 is resetted to 0 when ENABLE (Pin 4) is set from GND to Vcc.
Page 16 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide PTAT current Auto calibration µs PTAT_CAL Standby mode crystal oscillator ON  TX/RX mode STBY-RF Table 6: Timing characteristics (Vcc = 3V) SPI interface The RTX-24EM-HPS-Ax can be controlled with a 4-wire serial peripheral interface (SPI). The four wires are:...
Page 17 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide Figure 2: SPI timing diagram Symbol Parameters Units MOSI to SCK Setup SCK to MOSI hold SS to MISO Valid SCK to MISO Valid SCK low time SCKL SCK high time SCKH SCK frequency SS to SCK Setup...
Page 18 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide SPI Commands Read_RXFIFO This command returns the next byte out of the RXFIFO. It also returns the total number of bytes currently available in the RXFIFO (including the one being read). This SPI operation works together with the internal microcontroller and is functional only when this latter has been started (SPI command Start_Micro) and when the master clock is active (Crystal oscillator must be enabled).
Page 19 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 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 20 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 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 21 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 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 22 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 10.3 Internal PTAT current auto calibration This auto-calibration is used to calibrate the current delivered by the internal PTAT generator (Proportional To Absolute Temperature). The EM9209 has a dedicated subroutine located at the ROM_Boot_Address = 33 which will perform the calibration.
Page 23 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide  Crystal oscillator must be started (see section 9.2)  RB_Inst_Dis must be set to 1 (if RB_Inst_Dis has been previously set = 1, see section 9.2, this step can be omitted).  Use SPI command ROM_Boot with argument ROM_Boot_Address = 64.
Page 24 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 19.2 38.4 57.6 Table 9: On air VS Minimum bit stuffed data rates 10.6 RF operating frequency The channel register sets the center frequency of the transmission channel used by the EM9209. The channel is set by the Frequ[16:0]register.
Page 25 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide applications where the integrity of the address or the payload is critical, it is recommended to include CRC or error correction bits inside the payload. 10.8 TX Power level The PA output power can be adjusted to many different levels.
Page 26 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 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].
Page 27 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 10.12 Frequency error register : DFT_Mes[7:0] This Register located in RAM2@9[7:0] is updated by the subroutine in High Sensitivity communication mode each time that a packet is received. DFT_Mes[7:0] contains the signed frequency error between the transmitter and the receiver RF frequencies.
Page 28 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide 20. Wait the IRQ pin to go to high : this will mean that the VCO auto calibration subroutine has been executed. 21. Clear IRQ using the SPI command Clear_IRQ. 22. Send the SPI command ROM_Boot with ROM_Boot_Address = 256 for High sensitivity mode or 320 for Normal sensitivity mode.
Page 29 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide Reception programming flow 12.1 Reception flow, mode payload size defined in header This section describes the entire flow for receiving RF data, in mode payload size in the header, starting from the RTX-24EM-HPS-Ax in power down mode: ENABLE (Pin 4) = GND .
Page 30 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide Note 1: Reception mode is operated by the internal microcontroller, which operates by taking control of RAM2 and RXFIFO. Read and Write SPI accesses to RAM2 will put the microcontroller on hold. If the SPI transaction time is too long (if SCK frequency is close to channel data rate), correct reception operation can be corrupted.SPI commands to retrieve RAM2 values such as Limit_RSSI[3:0] or DFT_Mes[7:0] should be...
Page 31 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide RAM2[11:0]@ Address 1 Default Reset Description Value Value Reserved Reserved Reserved Reserved Reserved Reserved. Reserved Reserved Reserved Reserved Tx_On_Pad TX_On Pad control. Set by internal microcontroller. Rx_On_Pad RX_On Pad control. Set by internal microcontroller. Reserved Reserved.
Page 32 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide RAM2[11:0]@ Address 3 Default Reset Description Value Value Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved VCO_Code[3] VCO_Code[2] The VCO tuning code is determined automatically by auto calibration procedure. VCO_Code[1] VCO_Code[0] RAM2[11:0]@ Address 4 Default...
Page 33 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide RAM2[11:0]@ Address 5 Default Reset Description Value Value Reserved Reserved Reserved Reserved Reserved. Reserved Reserved Reserved Reserved Main_PTAT[3] Main_PTAT[2] Control of the main chip PTAT current bias. Main_PTAT[1] Main_PTAT[0] RAM2[11:0]@ Address 6 Default Reset Description Value...
Page 34 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide RAM2[11:0]@ Address 7 Default Reset Description Value Value Reserved Reserved Reserved Reserved Reserved Reserved Reserved. Reserved Reserved Reserved Reserved Reserved Reserved RAM2[11:0]@ Address 8 Default Reset Description Value Value Reserved Reserved Reserved Reserved. Reserved Reserved Reserved RB_Inst_Dis ROMboot Instruction Disable.
Page 35 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide RAM2[11:0]@ Address 9 Default Reset Description Value Value Reserved Reserved Reserved. Reserved Reserved DFT_Mes[7] DFT_Mes[6] DFT_Mes[5] DFT_Mes[4] Error frequency measured by DFT in High Sensitivity mode. DFT_Mes[3] DFT_Mes[2] DFT_Mes[1] DFT_Mes[0] RAM2[11:0]@ Address 10 Default Reset Description...
Page 36 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide RAM2[11:0]@ Address 11 Default Reset Description Value Value Reserved Reserved Reserved Reserved Reserved Reserved Reserved. Reserved Reserved Reserved Reserved Reserved Reserved RAM2[11:0]@ Address 12 Default Reset Description Value Value Ch_Rate[2] Ch_Rate[1] Bandwidth of the normal sensitivity demodulator.
Page 37 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide RAM2[11:0]@ Address 13 Default Reset Description Value Value Reserved Reserved Reserved. Reserved Reserved Address[7] Address[6] Address[5] Address[4] Address Byte Value. Address[3] Address[2] Address[1] Address[0] RAM2[11:0]@ Address 14 Default Reset Description Value Value Reserved Reserved. Reserved Frequ[4]...
Page 38 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide RAM2[11:0]@ Address 15 Default Reset Description Value Value Frequ[16] Frequ[15] Frequ[14] Frequ[13] Frequ[12] Frequ[11] Synthesizer's RF Frequency MSB's. Frequ[10] Frequ[9] Frequ[8] Frequ[7] Frequ[6] Frequ[5] RF Packet format In normal sensitivity mode, each packet contains the following information:...
Page 39 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide Packet information Length Description Marking 14ms Initial frequency step used to lock high sensitivity demodulator. Preamble = 2 * '11001100' 2 byte Clock recovery initialization. 3 * Address Byte 3 byte This field consists of 3 Address byte Address[7:0].
Page 40 XTR-EM24-HPS-AI, XTR-EM24-HPS-AE User guide Other components: 1. When mounting the module parallel to the PCB ( RTX-24EM-HPS-AI ) 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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