Based on a magnetometer, the IIS2MDC and ISM303DAC from STMicroelectronics enable both tamper detection for smart meters and motion sensing. The anisotropic magneto-resistive magnetometer used in each device has a dynamic range of ±50 gauss. In addition, the IIS2MDC and ISM303DAC provide an embedded temperature sensor and a 16-bit digital output via a built-in I2 C/SPI serial interface.
Both the IIS2MDC and ISM303DAC furnish three magnetic field channels, while the ISM303DAC adds three acceleration channels with user-selectable full-scale ranges of ±2 g, ±4 g, ±8 g, and ±16 g. This allows the ISM303DAC to offer dual-mode magnetic/physical tamper detection. It also serves such applications as antenna pointing, positioning and navigation, robot guidance, and general industrial motion tracking or distance sensing.