Magnetic turn count sensor records rotations of an external magnetic field while power is removed. The device reports absolute position through an SPI interface after power-up and counts up to 46 turns. Angle measurement accuracy is ±0.25° in a perfect magnetic system, with a 100 kSPS measurement update rate. Operation uses a 3.3 V IC supply, supports a 1.7 V to 5 V SPI interface, and is specified for a −40°C to +150°C junction temperature range.
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| Sensor type | Magnetic turn count sensor |
| Turn count detection range | 0 to 46turns |
| Digital output range | >16000degrees |
| Angle measurement accuracy | ±0.25 typicaldegrees |
| Measurement update rate | 100kSPS |
| IC supply voltage | 3.3V |
| SPI interface voltage | 1.7 to 5V |
| Magnetic field operating window | 16 to 31mT |
| Junction temperature range | -40 to +150°C |
| Package | 24-pin TSSOP |
| Angle noise, IIR filter disabled | 0.25degrees RMS |
| Angle noise, IIR filter enabled | 0.03degrees RMS |
| Internal temperature sensor accuracy | ±5°C |
| Internal temperature sensor resolution | ±0.07°C |
| Start-up time | 10ms |
| SPI interface | Supported |
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These are design resources that include the Analog Devices ADMT4000
Reference design for the ADMT4000 multiturn sensor featuring an integrated magnetic reset circuit, SPI interface, and LT3467-based voltage boost for GMR sensor recovery.
User guide for the ADMT4000DRV-SRC software package. Covers no-OS drivers, IIO frameworks, and example projects for ADMT4000 magnetic sensor evaluation on various platforms.
Evaluation platform for the ADMT4000 zero power multiturn sensor, featuring SPI communication, magnetic reset circuitry, and GUI-based data logging and configuration.
User guide for the ADMAGB3476 magnet and ADMAGMECH04 shield designed for the ADMT4000 position sensor, featuring stray magnetic field protection and Samarium Cobalt magnets.
