Asahi Kasei Microdevices/AKM AK09970D

Overview

AK09970D from AKM Semiconductor is an ultra-small tri-axis magnetic smart switch based on Si Hall technology, delivering 1.1 µT/LSB resolution in high-sensitivity mode, ±36 mT measurement range per axis (X/Y/Z), and programmable ODR up to 2000 Hz - enabling precise magnetic event detection in space-constrained mobile and IoT devices.

For engineers reviewing the AK09970D datasheet, AK09970D pinout, AK09970D application, or AK09970D equivalent, key selection considerations include its 1.35 mm WL-CSP package, open-drain OD-INT interrupt output, I²C digital interface, low-power intermittent operation (27 µA @ 100 Hz), and dual-threshold magnetic event triggering per axis.

Technical Context

The AK09970D integrates a tri-axis Si Hall sensor with on-chip signal conditioning, ADC, and digital control logic. It supports configurable intermittent measurement (0.25–100 Hz) plus single-shot mode, with data-ready flag and programmable magnetic-event interrupts via dedicated OD-INT pin.

Its architecture enables autonomous magnetic threshold detection without host CPU polling: two independent thresholds per axis (set at 1.1 µT resolution), DRDY register flag, and flexible interrupt routing - all operating within 1.7–3.6 V supply and consuming only 27 µA average current at 100 Hz ODR.

Key Specifications

Pinout & Package

AK09970D uses a 1.35 mm × 1.35 mm, 6-pin Wafer-Level Chip-Scale Package (WL-CSP) with 0.4 mm pitch and bottom-side solder balls.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar tri-axis magnetic smart switch applications.

Compared with IAM-20380 and A1324LLHLT-T, the AK09970D uniquely combines tri-axis sensing, hardware-accelerated dual-threshold event detection, I²C digital output, and 1.35 mm WL-CSP packaging - making it optimal for space- and power-constrained mechanical state sensing where autonomous interrupt-driven operation is critical.

Availability

AK09970D is available at Aetrix Electronics and suitable for smartphone lid detection, wearable gesture sensing, IoT asset tracking, and industrial panel button emulation requiring stable component supply and long-term lifecycle support.

Supply support for AK09970D includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

AKM Semiconductor Inc. is a Japanese fabless semiconductor company specializing in analog/mixed-signal sensors and audio ICs, with decades of expertise in magnetic sensing and signal processing.

The AK0997x family was designed specifically for ultra-compact, low-power magnetic event detection in mobile and portable electronics - prioritizing small footprint, autonomous interrupt capability, and millitesla-range resolution.

FAQ

What is the primary function of the AK09970D?

The AK09970D is a tri-axis magnetic smart switch that autonomously detects magnetic field changes across X, Y, and Z axes and generates hardware interrupts or data-ready flags without host polling. Its core function is low-power, deterministic mechanical state sensing - such as lid open/close, button press, or rotation - using programmable per-axis thresholds and I²C digital output. The AK09970D delivers this functionality in a 1.35 mm WL-CSP package with 27 µA average current draw at 100 Hz ODR.

Does the AK09970D support both push-pull and open-drain interrupt outputs?

No - the AK09970D provides only an open-drain interrupt output on the OD-INT pin, which requires an external pull-up resistor to VDD. It does not support push-pull (CMOS) drive on the interrupt line. This design allows wired-OR connection with other open-drain peripherals and simplifies level-shifting in mixed-voltage systems. The AK09970D's OD-INT pin can be configured to assert on magnetic events or data-ready conditions via internal register settings.

What is the maximum sampling rate supported by the AK09970D?

The AK09970D supports a maximum output data rate (ODR) of 2000 Hz, enabling high-speed magnetic transient capture for applications like rapid swipe detection or vibration analysis. This maximum rate applies to continuous measurement mode. In intermittent drive mode - used for ultra-low-power operation - selectable ODRs are 0.25, 0.5, 1, 10, 20, 15, and 100 Hz. The AK09970D achieves 2000 Hz while maintaining 1.1 µT/LSB resolution and ±36 mT full-scale range.

Can the AK09970D measure geomagnetic fields accurately enough for electronic compass use?

Yes - the AK09970D achieves 1.1 µT/LSB resolution and ±36 mT full-scale range, covering Earth's geomagnetic field (25–65 µT) with >20-bit effective dynamic range. However, it is optimized for magnetic event detection rather than absolute heading calculation; temperature compensation and hard/soft iron calibration must be implemented externally. For basic compass-grade orientation relative to local field gradients, the AK09970D provides sufficient resolution and stability - especially when paired with accelerometer fusion - but the AK09970D is not pre-calibrated for standalone e-compass applications.

Is the AK09970D pin-compatible with other members of the AK0997x family, such as AK09970N?

Yes - the AK09970D and AK09970N share identical 6-pin WL-CSP packaging, pinout, and electrical interface; they differ only in magnetic sensitivity calibration and default register settings. Both support the same I²C commands, interrupt behavior, and ODR configurations. The AK09970D is specified for ±36 mT range with 1.1 µT/LSB resolution, while AK09970N offers wider ±101 mT Z-axis range. Layouts designed for AK09970D are directly usable with AK09970N without modification.