ANALOG DEVICES ADMT4000BRUZAB Multiturn Sensor, True power-on, 0.016 T to 0.031 T, 3 V to 3.6 V, TSSOP-24

ADMT4000BRUZAB is a true power-on multiturn sensor. It is a magnetic turn count sensor capable of recording the number of rotations of a magnetic system even while the device is powered down. On power-up, the device can be interrogated to report the absolute position of the system. The absolute position is reported through a serial-peripheral interface (SPI). The ADMT4000 counts up to 46 turns of an external magnetic field, which increments the absolute position in the clockwise (CW) direction. The device includes three magnetic sensors, a giant magneto resistance (GMR) turn count sensor, which is used to count the number of rotations on the system, a GMR quadrant detecting sensor, and an anisotropic magnetoresistance (AMR) angle sensor. Applications include rotation count detection and storage without power, contactless absolute position measurement, brushless DC motor control and positioning, and actuator control and positioning.

• True power-on multiturn counter, angle sensor with ±0.25° accuracy
• SPI interface, under and over voltage detection
• >16k° digital output, measurement update rate 100kSPS
• Internal temperature sensor, IC supply (3.3V)
• SPI interface 1.7V to 5V
• Input leakage current is ±10?A max at VDD=3.3 V ±10%, VSS=0 V, TJ=-40°C to +150°C
• Magnetic-field operating window is 31mT max measured at 25°C
• Start-up time is 10ms maximum
• 24-lead TSSOP package
• Ambient temperature range from -40°C to +125°C