By Steve Bush 12th October 2021
Texas Instruments is claiming “industry’s most accurate 3D Hall-effect position sensor” for one that provides 2.6% full-scale total error at room temperature.
The first device in a family of 3D Hall-effect position sensors, TMAG5170 is intended for factory automation and motor-drives.
Designed for rotational sensing (diagram below), it has three independent Hall sensors for X, Y, and Z-axes backed by a precision signal-chain and 12bit ADC.
Any two of these axis can be picked, after which the integrated angle calculation engine (CORDIC) provides 360° angular position information for both on-axis and off-axis mechanical arrangements (diagram below) – on-axis measurement is the preferred topology.
On-chip temperature sensing is included for system-level drift compensation.
Using the SPI interface, sensitivity is individually settable for each axis over ±25, ±50 or ±100mT in the TMAG5170A1 version, or ±75, ±150 or ±300mT in the TMAG5170A2. Many sample rates can be selected, with slower rates delivering batter signal to noise ratios. They range from as fast as 20ksample/s (one channel only) to all three channels at 400sample/s.
Two channel power consumption is 292µA at 1Khz data rate (Vcc = 5V) and 1.6µA at 1Hz.
X, Y, Z magnetic and die temperature data are output over SPI, and cyclic redundancy check is implemented. Diagnostic blocks are embedded to enable checks for communication, continuity and internal signal path – as well as configurable diagnostics for the external power supply, magnetic field and system temperature.
An alert function can trigger an output to generate an interrupt signal when a conversion completes or a diagnostic test detects an error, or it can be configured as a magnetic switch with one or multiple magnetic thresholds on the various channels. The alert can be delayed for a number of threshold crossings to improve noise performance.
Packaging is 8pin 3 x 5mm plastic small-outline and operation is over 2.3 to 5.5V and -40 to 150°C.
The TMAG5170 product page is here
Tagged with: Hall magnetic field sensor Texas Instruments TI
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