Mikroelektronika d.o.o.
SKU: MIKROE-4242ISM TX Click Board
ISM TX Click Board
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The ISM TX Click Board™ is a compact add-on board that contains an ASK and (G)FSK transmitter with a programmable SPI interface. This board features the MAX41460, a UHF sub-GHz ISM/SRD transmitter designed to transmit On-Off Keying (OOK), Amplitude-Shift Keying (ASK), Frequency-Shift Keying (FSK), and Gaussian (G)FSK (or 2GFSK) data from Maxim Integrated. The fast response time of the integrated PLL allows for frequency-hopping, spread-spectrum protocols for increased range and security. Its crystal-based architecture provides greater modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and reduced temperature dependence. This Click Board™ is fitting for remote low-speed communication, such as remote keyless access, garage or gate doors control, home automation, and similar applications where this kind of communication is applicable.
The ISM TX Click Board™ is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click Board™ comes as a thoroughly tested product, ready to be used on a system equipped with the mikroBUS™ socket.
How Does The ISM TX Click Board™ Work?
The ISM TX Click Board™ is based on the MAX41460, a UHF sub-GHz ISM/SRD transmitter designed to transmit On-Off Keying (OOK), Amplitude- Shift Keying (ASK), Frequency-Shift Keying (FSK), and Gaussian (G)FSK (or 2GFSK) data from Analog Devices. The crystal-based architecture of the MAX41460 provides greater modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and reduced temperature dependence. It integrates a fractional phase-locked loop (PLL); so a single, low-cost crystal of 16MHz used on this Click board™ can generate commonly used worldwide sub-GHz frequencies. A buffered clock-out signal makes the device compatible with almost any MCU or code-hopping generator. The MAX41460 features a fast oscillator Wake-Up upon data activity detection and has an Auto-Shutdown feature to extend battery life.
The ISM TX Click Board™ has four primary operating states: Shutdown, Stand-By, Programming, and Transmitter-Enabled Mode. These states describe the Power-ON/Power-OFF status of the transmitter's three primary internal circuit blocks: the crystal oscillator (XO), the PLL synthesiser, and a high-efficiency, open-drain switching-mode power amplifier (PA). To ensure the MAX41460 enters the shutdown state after Power-On, the DATA pin must be held low at Power-On. The PA pin is used to adjust the frequency with only frequency-dependent components required for the connected external antenna-matching network so that the frequency of this Click board™ is fixed to 433.92MHz.
The MAX41460 communicates with MCU using the standard SPI serial interface with a maximum frequency of 20 MHz. The device can support two types of SPI transactions: register access only and register access followed by data transmission. In both Shutdown and Stand-By states, programming through the SPI interface is not allowed. Configuration register values are retained in all states unless changed by programming or if the device is powered off. This Click board™, alongside the power LED indicator, has an additional green LED indicator labelled as DATA used to visually indicate the successful transmission of data across the SPI interface.
ISM TX Click possesses the SMA antenna connector and can be used for connecting the appropriate antenna that MikroE has in its offer, such as Rubber Antenna GSM/GPRS Right Angle. This antenna is an excellent choice for all GSM/GPRS applications and supports various frequencies and bands.
This Click board™ is designed to be operated only with a 3.3V logic voltage level. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with different logic levels. However, the Click board™ comes equipped with a library that contains easy-to-use functions and an example code that can be used as a reference for further development.
SPECIFICATIONS
| Type | Sub-1 GHz Transceivers |
| Applications | Can be used for remote low-speed communication, such as remote keyless access, garage or gate doors control, home automation, and similar applications where this kind of communication is applicable. |
| On-board modules | ISM TX Click is based on the MAX41460, a UHF sub-GHz ISM/SRD transmitter designed to transmit On-Off Keying (OOK), Amplitude- Shift Keying (ASK), Frequency-Shift Keying (FSK), and Gaussian (G)FSK (or 2GFSK) data from Maxim Integrated. |
| Key Features | Increased range, data rates, and security extend battery life with low supply current, selectable modes, greater modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and more. |
| Interface | SPI |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V |
PINOUT DIAGRAM
This table shows how the pinout of the ISM TX Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| NC | 2 | RST | INT | 15 | NC | ||
| SPI Chip Select | CS | 3 | CS | RX | 14 | NC | |
| SPI Clock | SCK | 4 | SCK | TX | 13 | NC | |
| SPI Data OUT | SDO | 5 | MISO | SCL | 12 | NC | |
| SPI Data IN | SDI | 6 | MOSI | SDA | 11 | NC | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | NC | |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| LD2 | DATA | - | DATA LED Indicator |
| CN1 | ANT | - | SMA Antenna Connector |
ISM TX CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 1.8 | 3 | 3.6 | V |
| Frequency Range | 286 | - | 960 | MHz |
| ASK Modulation Depth | - | 70 | - | dB |
| Output Power | 11 | - | 16 | dBm |
| Operating Temperature Range | -40 | - | +105 | °C |
Software Support
We provide a library for the ISM TX Click on our LibStock page and a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
Library Description
Library provides functions for communication with Click board, specific ones to configure the device, setting frequency, frequency deviation, baud rate, and one for sending(transmit) data.
Key Functions
void ismtx_initial_cfg ( void )- Function for initial configurationuint8_t ismtx_set_frequency ( uint32_t freq )- Function for setting transmit frequencyvoid ismtx_send_data ( uint8_t *tx_data, uint8_t tx_len )- Function for transmitting data
Example Description
The application is composed of three sections :
- System Initialization - Initialization of CS pin and LOG module
- Application Initialization - Initialization for configuration, resets the device, sets default configuration, and sets parameters for communication.
- Application Task - Sends predefined data every second.
void application_task ( )
{
ismtx_send_data( &data_send[ 0 ], 8 );
mikrobus_logWrite( " * Transmit done! * ", _LOG_LINE );
Delay_ms( 1000 );
}
Additional Functions :
- void manchester_spi_init ( void ) - Wrapper function over SPI init for sending data
- void normal_spi_init ( void ) - Wrapper function over SPI init for regular communication
The complete application code, and ready-to-use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
- SPI
- UART
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, USB UART 2 Click Board™ or RS232 Click Board™ to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
MIKROSDK
The ISM TX Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
ISM TX Click Board
Frequently Asked Questions
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