Murata introduces 1D and 2D TMR magnetic sensors
1D linear and 2D angular sensor devices from Crocus Technology are based on tunnel magnetic resistance (TMR) technology and available from Murata. There are two temperature and packaging options.
The sensor devices offer elevated levels of operational stability over a broad temperature range from -40 to +85 degrees C, or from ‑40 to +125 degrees C with extended versions.
The CT100 1D linear sensor has a wide dynamic range (covering ±50mT) and also exhibits linearity with a linear error of just ±0.5 per cent at ±20 mT. Murata, claims this figure leads the industry and enables improved measurement reproducibility and negates the need for compensation circuitry to address temperature fluctuations. The CT100 1D sensor supports a wide operating voltage range of 1.0 to 5.5V. It is intended for linear measurements, proximity sensing and current sensing.
The second introduction is the CT310, a 2D angular sensor with an operating magnetic range from 25 to 90mT. It also has differential outputs for both sine (SIN) and cosine (COS) axes. Target applications are angular position measurement and brushless DC (BLDC) motor control. The sensor has a low angular error of up to 0.6 degrees once amplitude normalisation and offset cancellation have both been applied. Like the CT100, the input voltage range is 1.0 to 5.5V.
Another advantage for both sensors, says Murata, is that a minimal number of peripheral components is needed to accompany these devices which saves board space and accelerates system development.
The CT100 is supplied in either a six-lead SOT23 or a six-lead DFN package. The CT310 is available in both eight-lead TSSOP and eight-lead DFN package formats.