ADMT4000 Datasheet | Analog Devices

Features - True power-on multiturn counter - 46-turn magnetic sensor - >16k° digital output - ±0.25° accuracy - Measurement update rate 100 k SPS - 16 m T to 31 m T operating range - Internal temperature sensor - IC supply, 3.3 V - SPI interface, 1.7 V to 5 V - Junction temperature range: - 40°C to +150°C - 24-pin TSSOP - Industrial applications APPLICATION - Rotation count detection and storage without power - Contactless absolute position measurement - Brushless DC motor control and positioning - Actuator control and positioning GENERAL DESCRIPTION The ADMT4000 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 Data Sheet True Power-On Multiturn Sensor 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. The AMR angle sensor is used in bination with a GMR quadrant detecting sensor to determine the absolute position of the system within 360°. bining the GMR turn count sensor output with the AMR angle sensor output enables the device to report the position of the system with a high degree of angular accuracy. PRODUCT HIGHLIGHTS - True power-on multiturn counter - Angle sensor with ±0.25° accuracy - SPI interface - Under and over voltage detection FUNCTIONAL BLOCK...