ISM TX Click Board™

Product Code: MIKROE-4242

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 SD