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AKM develops a 14-bit, ±0.1° angle accuracy, absolute magnetic rotation angle sensor with support for off-axis configuration

2019-04-16 | Return

Product Name：AK7454

Product Category：Angle Sensors

Title：Si Monolithic Rotation Angle Sensor IC with Hall Element

Applications：
Motor Control Applications
・Robots
・Machine Tools
・Stepping Motors, DC Brushless Motors

Description
Asahi Kasei Microdevices (AKM) has developed the AK7454, an absolute magnetic rotation angle sensor with enhanced calibration functionality and a significantly-reduced package size. Samples are shipping now, with mass production beginning in October of 2019.

The AK7454 integrates an advanced user calibration function, enabling it to calibrate angular errors caused by mounting misalignment, magnet characteristics, etc. Additionally, shaft-end and off-axis configurations are supported.

An internal EEPROM allows for programming of a zero-point setting, rotation direction, ABZ output resolution (1 to 4096 ppr), and number of poles of UVW output (1 to 32 pole pairs). The AK7454 can track rotation at speeds up to 25,000 rpm via the tracking servo system architecture, with an output delay time of 1.2μs. The AK7454 adapts a small and thin QFN24 package. The supply voltage range is 3.0 to 5.5V.

Features
● Supports Off-Axis Configuration
The operating magnetic field range of the AK7454 has expanded to cover 10 to 70mT, allowing for off-axis configurations. A shaft-through type motor system can be constructed with this off-axis configuration, helping to make the motor system thinner and enabling the construction of a hollow structure type.

● Angle Error Calibration Function
High accuracy calibration can be performed with 16+ points of measurement data in a single rotation. By writing the 1st to 4th order calibration parameters to the internal EEPROM, an angular accuracy of ±0.1deg(typ.) can be achieved, even in the off-axis configuration.

Main Specifications

Product Name	AK7454	AK7452	AK7451
Package	QFN24 (4.0 × 4.0 × t0.85mm)	TSSOP16 (5.0 × 6.4 × t1.07mm)	SOP16 (9.9 × 6.0 × t1.75mm)
Configuration	Shaft-End Off-Axis	Shaft-End
Supply Voltage [V]	3.0 to 5.5		4.5 to 5.5
Operating Temperature [°C]	-40 to 125
Magnetic Field Range [mT]	30 to 70 (Shaft-End) 10 to 70 (Off-Axis)	30 to 70
Resolution [bit]	14		12
Output Format	SPI, ABZ, UVW
Angle Error Calibration Function	Available (1st to 4th order)	Available (1st to 2nd order)	N/A
INL@Room Temperature [deg] *Non-calibrated, Shaft-End	±0.5		±0.6
INL@Room Temperature [deg] *Calibrated (typ.)	±0.1 (Shaft-End, Off-Axis)	±0.1 (Shaft-End)	-
Thermal Angle Drift [deg] *Ta=25°C basis	±0.5		±0.9
Output Noise (p-p) [deg]	±0.022		±0.176
Delay Time [μs]	1.2	1.8
Rotation Tracking [rpm]	25,000		20,000
ABZ Resolition Setting [ppr]	1 to 4096		128, 256, 512, 1024
UVW Poles [pole pairs]	1 to 32		1 to 8
SPI Frequency [MHz]	8		2
Supply Current [mA]	22	20	16

source：http://www.akm.com