Compass 7 Click is a compact add-on board perfect for applications like an electronic compass. This board features the MMC5633NJL, a monolithic complete 3-axis AMR magnetic sensor with on-chip signal processing and an integrated digital bus from MEMSIC. It can measure magnetic fields within the full-scale range of ±30 Gauss (G) with up to 0.0625mG per LSB resolution at 20bits operation mode and 2mG total RMS noise level, enabling heading accuracy of ±1º in electronic compass applications. Also, an integrated SET/RESET function eliminates thermal variation-induced offset error (Null field output) and clears the residual magnetization resulting from powerful external fields. This Click board™ is suitable, as mentioned before, as an electronic compass but also can be used in various position sensing applications.

Compass 7 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

Compass 7 Click as its foundation uses the MMC5633NJL, a monolithic high-performance 3-axis AMR magnetic sensor from MEMSIC. It comes with an integrated drive circuit, signal processing circuit, and serial interface block, allowing low noise and high resolution. It can measure magnetic fields within the full-scale range of ±30 Gauss (G) with up to 0.0625mG per LSB resolution at 20bits operation mode and 2mG total RMS noise level, enabling heading accuracy of ±1º in electronic compass applications.

An integrated SET/RESET function eliminates errors due to Null Field output change with temperature. In addition, it clears the sensors of any residual magnetic polarization resulting from exposure to strong external magnets. The SET/RESET function can be performed periodically for each measurement as the specific application requires.

Compass 7 Click communicates with MCU using the standard I2C 2-Wire interface with a maximum clock frequency of 400kHz, fully adjustable through software registers. The MMC5633NJL does not require a specific Power-Up sequence but requires a voltage of 1.8V for its interface and logic part to work correctly. Therefore, a small regulating LDO is used, the MAX8511, providing a 1.8V out of mikroBUS™ power rails. Since the sensor for operation requires a power supply of 1.8V, this Click board™ also features the PCA9306 voltage-level translator allowing the MMC5633NJL to work with 3.3V and 5V MCU properly.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the 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.

• Interface: I²C
• Compatibility: mikroBUS™
• Dimensions: 28.6 x 25.4mm
• Input Voltage: 3.3V or 5V
• Field Range (Each Axis): ±30G
• Accuracy: ±1 Deg
• Resolution: 20 bits
• Operating Temperature Range: Min. -40°C, Typ. +25°C, Max. +85°C

• Schematic
• MAX8511 Datasheet
• MMC5633NJL Datasheet
• PCA9306 Datasheet
• mikroSDK
• GitHub