AK8963 three-axis magnetometer pinout

The AK8963 measures magnetic field on three axes with I²C or 4-wire SPI and stores factory sensitivity coefficients in fuse ROM.

QFN-16 · 3 × 3 mm

16 contacts Current package

Asahi Kasei Microdevices ·

QFN-16 · 3 × 3 mm

Top view with the pin-1 dot at the lower left. The lower edge begins at pin 1. Scroll the map to reach all contacts.

Input · Address

I²C address bit 1. Strap to VDD or VSS. Tie to VSS for SPI.

Asahi Kasei Microdevices MS1356-E-02 (October 2013), §§ 4–5 and 7–11. Manufacturer PDF hosted by MikroElektronika.

Pin	Signal	Direction	Function
1	DRDY Output	Output	Active-high data-ready signal. The host can also read the data-ready status bit.
2	CSB Input	Input	Active-low SPI chip select. Tie to VID for I²C.
3	SCL/SK Input	Input	Clock input in either I²C or SPI mode.
4	RSV Leave open	Leave open	Reserved output. Keep electrically disconnected.
5	SDA/SI Bidirectional	Bidirectional	Open-drain data in I²C mode or host-to-sensor data input in SPI mode.
6	SO Output	Output	Sensor-to-host data output in SPI mode. Leave open in I²C mode.
7	TRG Input	Input	External measurement trigger. Internally pulled down. Ground or leave open when unused.
8	VID Supply input	Supply input	Digital interface rail. Use this rail for I²C pull-ups and inactive CSB/RSTN.
9	NC None	None	No internal connection. Leave electrically open unless the package notes specify otherwise.
10	RSTN Input	Input	Active-low hardware reset. Tie to VID if unused.
11	CAD1 Input	Input	I²C address bit 1. Strap to VDD or VSS. Tie to VSS for SPI.
12	CAD0 Input	Input	I²C address bit 0. Strap to VDD or VSS. Tie to VSS for SPI.
13	VSS Supply return	Supply return	Common analog and digital return.
14	TST1 Input	Input	Test input with internal pull-down. Leave open or connect to VSS.
15	VDD Supply input	Supply input	Device supply. Place the bypass capacitor close to this pin.
16	NC None	None	No internal connection. Leave electrically open unless the package notes specify otherwise.

With CSB tied to VID, CAD1:CAD0 select 0x0C–0x0F. The measurement data includes little-endian signed axis values.

Use separate host-to-sensor and sensor-to-host data paths with both address straps grounded.

Parameter	Limit	Conditions and source
Analog supply VDD2.4–3.6 V	2.4–3.6 V	Use separate local bypassing for VDD and VID even on a shared rail. Asahi Kasei Microdevices MS1356-E-02 (October 2013), §§ 4–5 and 7–11. Manufacturer PDF hosted by MikroElektronika.
Interface supply VID1.65 V to VDD	1.65 V to VDD	Set the logic levels and pull-ups using this voltage. Asahi Kasei Microdevices MS1356-E-02 (October 2013), §§ 4–5 and 7–11. Manufacturer PDF hosted by MikroElektronika.
Measurement ranges14- or 16-bit output	14- or 16-bit output	Select output depth using the control register. Apply the per-axis sensitivity coefficient to the raw value. Asahi Kasei Microdevices MS1356-E-02 (October 2013), §§ 4–5 and 7–11. Manufacturer PDF hosted by MikroElektronika.

Separate maps cover the AK8963N QFN and AK8963C wafer-level packages. Match the package-specific magnetic axes in the datasheet.

AK8963 manufacturer documentation· Asahi Kasei Microdevices MS1356-E-02 (October 2013), §§ 4–5 and 7–11. Manufacturer PDF hosted by MikroElektronika.