ISM TX Click 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 Analog Devices. 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 the remote keyless access, garage or gate doors control, home automation, and similar applications where this kind of communication is applicable.
ISM TX Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
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 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 world-wide sub-GHz frequencies. A buffered clock-out signal makes the device compatible with almost any MCU or code-hopping generator. The MAX41460 feature fast oscillator Wake-Up upon data activity detection and has an Auto-Shutdown feature to extend battery life.
This Click board™ has four major 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 synthesizer, 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 external antenna-matching network that are connected in such a way 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 power LED indicator, has an additional green LED indicator labeled as DATA used to visually indicate the successful transmission of data across the SPI interface.
ISM TX Click possesses on itself the SMA antenna connector and it can be used for connecting the appropriate antenna.
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.
Features:
- Interface: SPI
- Compatibility: mikroBUS™
- Dimensions: 28.6 x 25.4mm
- Input Voltage: 3.3V
- Supply Voltage: Min. 1.8V, Typ. 3V, Max. 3.6V
- Frequency Range: Min. 286MHz, Max. 960MHz
- ASK Modulation Depth: 70dB
- Output Power: Min. 11dBm, Max. 16dBm
- Operating Temperature Range: Min. -40°C, Max. +105°C
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