MIKROE UWB Click is an Ultra-Wideband transceiver Click board™ that can be used in 2-way ranging or TDOA location systems to locate assets to a precision of 10 cm and supports data rates of up to 6.8 Mbps. This Click board™ features the DWM1000 module based on Decawave's DW1000 Ultra-Wideband (UWB) transceiver from Decawave Limited. It features a frequency range from 3.5GHz to 6.5GHz, a very precise location of tagged objects, up to 6.8Mbps data rates, low power consumption, and more while the communication with the MCU is accomplished through a standard SPI serial interface. This Click board™ is optimized for applications in real-time location systems and wireless sensor networks across a variety of markets including agriculture, building control and automation, factory automation, healthcare, safety & security, warehousing & logistics, and a range of others.
UWB Click is based on Decawave’s DWM1000, UWB compliant wireless transceiver module from Decawave Limited. RF components, Decawave UWB transceiver, and other components reside on-module. DWM1000 enables cost-effective and reduced complexity integration of UWB communications and ranging features, greatly accelerating design implementation. This module enables the location of objects in real-time location systems (RTLS) to a precision of 10cm indoors, high data rate communications up to 6.8 Mbps, and excellent communications range of up to 300m thanks to coherent receiver techniques. The module contains an on-board 38.4 MHz reference crystal, which has been trimmed in production to reduce the initial frequency error to approximately 2 ppm, using the transceiver’s internal on-chip crystal trimming circuit.
The DWM1000 module communicates with MCU using the standard SPI serial interface with a maximum SPI frequency of 20 MHz. This module also has several GPIO pins, while in this case two of them are used to drive LED indicators that notify the user which configuration of the transceiver is used (TX or RX). Also, it possesses Reset and Interrupt pins routed to the INT and RST pin of the mikroBUS™. When power is applied to the DWM1000, the RST pin is driven low by internal circuitry as part of its power-up sequence. RST remains low until the on-module crystal oscillator has powered up and its output is suitable for use by the rest of the device, at which time RST is stated high. RST pin may also be used as an output to reset external circuitry as part of system bring-up as power is applied.
Always-On (AON) memory can be used to retain DWM1000 configuration data during the lowest power operational states when the on-chip voltage regulators are disabled. Depending on the end-use applications and the system design, DWM1000 settings may need to be tuned. To help with this tuning several built-in functions such as continuous wave TX and continuous packet transmission can be enabled. To maximize range, DWM1000 transmit power spectral density (PSD) should be set to the maximum allowable for the geographic region in which it will be used. As the module contains an integrated antenna, the transmit power can only be measured over the air. The DWM1000 provides the facility to adjust the transmit power, and these adjustments can be used to maximize transmit power whilst meeting the regulatory spectral mask.
This Click Board™ uses the SPI communication interface. It is designed to be operated only with 3.3V logic levels. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with logic levels of 5V. More information about the DWM1000’s functionality, electrical specifications, and typical performance can be found in the attached datasheet. However, the Click board™ comes equipped with a library that contains easy to use functions and a usage example that may be used as a reference for the development.
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