EVA-M8M GNSS 모듈
(GNSS 11 CLICK)
개요
- 본 제품은 EVA-M8M GNSS 모듈입니다.
- ublox사의 EVA-M8M 칩을 장착하고 있는 GNSS 모듈로 GPS, GLONASS, Galileo, QZSS, SBAS, BeiDou 위성 신호를 수신할 수 있는 제품입니다.
- 3.3V 시스템과 사용이 가능합니다.
특징
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HOW DOES IT WORK?
GNSS 11 Click is based on the EVA-M8M, a concurrent GNSS module from u-blox. It can process up to three GNSS, but also it can be configured for a single GNSS operation using GPS, GLONASS, or BeiDou and disable QZSS and SBAS. The module can be configured to receive any single GNSS constellation or any set of permissible combinations according to the table from the datasheet. Galileo is not enabled as the default configuration. There are several features that EVA-M8M brings to you, such as assisted GNSS (AssistNowTM online/offline/autonomous), augmentation systems (SBAS), Differential GPS, odometer, data logging, geofencing, spoofing detection, and more.
GNSS 11 Click can use the SPI, I2C, or UART interface to communicate with the host MCU, which can be selected over the five COMM SEL jumpers. By default, UART and I2C are selected. The I2C is actually a DDC interface (I2C compliant) and can be operated in slave mode only, supporting a clock frequency of up to 400kHz. If you choose an SPI interface, you can count on 125kbps and 5.5MHz of clock frequency.
There are several pins on the mikroBUS™ socket that you can also use. The module can be reset over the RST pin. The antenna can be turned on over the ANT pin, which enables the TPS2041B, a current-limited power distribution switch from Texas Instruments. This switch feeds the power to an antenna, and if the output load exceeds the current-limit threshold or a short is present, the switch will limit the output current and notify the host MCU over the OC pin.
The EVA-M8M module also provides an SQI interface for optional external flash for future firmware upgrades and improved A-GNSS performance. This flash can be used for the AssitNowTM Offline feature to store the orbit data, for data logging, and more. Worth mentioning is that without the external flash, only GPS satellites are used, and the prediction time decreases to three days. The SQI flash can be connected over the SQI header.
This Click board™ comes equipped with a USB type C connector (2.0 FS), which can be used for communication as an alternative to the UART. In addition, thanks to the additional electronics on the board, this Click can also work in a standalone configuration, where the appropriate power supply voltage is provided by USB. The u-blox USB (CDC-ACM) driver supports Windows 7 and 8 operating systems, while for Windows 10, it is not required as it has a built-in USB serial driver. However, plugging initially into an internet-connected Windows 10 PC will download the u-blox combined sensor and VCP driver package. The interrupt INT pin can be used for control of the receiver or for aiding.
GNSS 11 Click possesses the SMA antenna connector with an impedance of 50Ω, which can be used to connect the appropriate active antenna, such as the GNSS Active External Antenna that MIKROE has in its offer for improved range and received signal strength.
The EVA-M8M module has a backup supply option on this Click board™ available as an onboard VCC input or over the coin battery. You can choose the backup source over the V BCKP switch. The time output pulse is available as a PPS LED indication. There are also several test pads on GNSS 11 Click. The EVA-M8M supports an active antenna supervisor, which enables the receiver to detect short circuits at the active antenna and antenna presence detection. The pads ANT_OFF, ANT_OK, and ANT_DET serve for testing purposes of this feature. The SAFEBOOT pad allows you to test the state of the module while entering the Safe Boot Mode, which is used for programming the flash memory in production or recovering a corrupted flash memory.
This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.
SPECIFICATIONS
Type GPS/GNSS Applications Can be used for the development of both acquisition and tracking devices and represents an ideal product for automotive, consumer, and industrial tracking applications On-board modules EVA-M8M - concurrent GNSS module from u-blox Key Features Standard precision GNSS, supports GPS/QZSS, GLONASS, Galileo, and BeiDou, three maximal concurrent GNSS, supports UART, SPI, and DDC (I2C compatible) interfaces, programmable flash, data logging, SQI flash as an option, antenna management, and more Interface I2C,SPI,UART,USB ClickID Yes Compatibility mikroBUS™ Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V,External
문서
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