AKM (Asahi Kasei Microdevices) Manufacturer Skill

Company Overview

AKM (Asahi Kasei Microdevices) is a Japanese semiconductor manufacturer specializing in:

• Audio ICs: High-performance DACs and ADCs for professional and consumer audio
• Magnetic Sensors: 3-axis magnetometers and electronic compasses
• Hall Effect Sensors: Position and rotation sensing
• IMUs: Combined 9-axis sensors with accelerometer, gyroscope, and magnetometer

AKM is renowned for their premium audio converters used in high-end audio equipment and their compact magnetic sensors used in smartphones and wearables.

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MPN Structure

AKM MPNs follow this general structure:

[PREFIX][SERIES][VARIANT][-][PACKAGE/OPTIONS]
   |       |       |           |
   |       |       |           +-- Package code or options
   |       |       +-- Variant/revision letter
   |       +-- Series number (4-5 digits)
   +-- Always "AK" prefix

Naming Convention by Product Family

Audio ICs:
AK4490 EQ    - Premium 32-bit DAC
AK4493 SEQ   - Upgraded premium DAC
AK5386 VT    - 24-bit ADC
AK4796 VQ    - Audio DAC

Magnetic Sensors:
AK8963 C     - 3-axis electronic compass
AK8975 A     - 3-axis compass
AK09918      - 3-axis compass, newer series

9-axis IMUs:
AK09911 C    - 9-axis sensor (accel+gyro+compass)
AK09912      - 9-axis with improved gyroscope
AK09913      - 9-axis combined sensor

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Product Families

Audio DACs (AK47xx, AK44xx)

Series	Description	Bits	Channels	Notes
AK4490	Premium DAC	32-bit	2	Flagship, VELVET SOUND
AK4493	Premium DAC	32-bit	2	Successor to AK4490
AK4495	Premium DAC	32-bit	2	Enhanced performance
AK4497	Reference DAC	32-bit	2	Top of line
AK4796	General DAC	24-bit	2	Cost-effective

Audio ADCs (AK44xx, AK53xx)

Series	Description	Bits	Channels	Notes
AK4490	High-perf ADC	24-bit	2	Multi-bit delta-sigma
AK5386	Stereo ADC	24-bit	2	Professional audio

Magnetic Sensors / Electronic Compasses (AK89xx, AK099xx)

Series	Description	Interface	Resolution	Notes
AK8963	3-axis compass	I2C/SPI	14/16-bit	Widely used, smartphones
AK8975	3-axis compass	I2C	13-bit	Older series
AK09911	9-axis IMU	I2C	16-bit	With accelerometer
AK09912	9-axis IMU	I2C	16-bit	With gyroscope
AK09913	9-axis IMU	I2C	16-bit	Combined sensor
AK09918	3-axis compass	I2C	16-bit	Newer, high precision
AK09940	3-axis compass	I2C/SPI	18-bit	High precision

High Precision Magnetic Sensors (AK099xx)

Series	Description	Notes
AK09970	Linear position sensor	Hall effect
AK09973	Switch sensor	Omnipolar
AK09911-AK09916	Hall sensors	Various applications

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Package Codes

Package codes appear as suffixes, typically separated or as trailing letters:

Code	Package	Size	Notes
TR	LGA	1.6x1.6mm	Tape and reel, common for sensors
CS	CSP	Small	Chip-scale package
WL	WLCSP	Tiny	Wafer-level CSP
TS	TSSOP	-	Thin shrink small outline
QFN	QFN	Various	Quad flat no-lead
BGA	BGA	Various	Ball grid array
EQ	QFN	5x5mm	Audio DAC package
VT	TQFP	7x7mm	Audio ADC package
VQ	QFP	-	Standard quad flat
SEQ	QFN	-	Enhanced QFN variant

Package Extraction Logic

// From AKMHandler.extractPackageCode():
// Split on hyphen, take suffix from main part
String[] parts = mpn.split("-");
String mainPart = parts[0];
String suffix = mainPart.replaceAll("^[A-Z0-9]+", "");

// Map known suffixes
switch (suffix) {
    case "TR" -> "LGA";
    case "CS" -> "CSP";
    case "WL" -> "WLCSP";
    case "TS" -> "TSSOP";
    case "QFN" -> "QFN";
    case "BGA" -> "BGA";
    default -> suffix;  // Return as-is
}

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Series Extraction Rules

The handler uses different extraction lengths based on product family:

Family	Prefix	Series Length	Example
Audio ICs	AK4, AK5	5 characters	AK4490, AK5386
Sensors	AK8, AK09	6 characters	AK8963C, AK09918

Series Extraction Logic

// From AKMHandler.extractSeries():
boolean isAudioIC = mpn.startsWith("AK4") || mpn.startsWith("AK5");
int maxLength = isAudioIC ? 5 : 6;

// Extract up to maxLength alphanumeric characters
// AK4490EQ -> AK449 (audio IC, 5 chars)
// AK8963C  -> AK8963 (sensor, 6 chars)
// AK09918  -> AK0991 (sensor, 6 chars)

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Interface Detection

For magnetic sensors, interface type can be extracted from the MPN:

Suffix/Indicator	Interface	Notes
Ends with "I"	I2C	I2C interface
Ends with "S"	SPI	SPI interface
Contains "I2C"	I2C	Explicit in name
Contains "SPI"	SPI	Explicit in name

Resolution Detection

For sensors, resolution may be indicated in the MPN:

Indicator	Resolution	Notes
Contains "14BIT"	14-bit	Lower resolution mode
Contains "16BIT"	16-bit	Standard resolution

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Supported Component Types

From

AKMHandler.getSupportedTypes()

:

ComponentType	Description	Pattern Examples
SENSOR	General sensors, IMUs	AK09[0-9]., AK0991[0-9].
MAGNETOMETER	Magnetic sensors, compasses	AK89[0-9]., AK099., AK8963., AK8975., AK09918.*
IC	Audio DACs and ADCs	AK449[0-9]., AK479[0-9]., AK4490., AK5386.

Note: The handler has commented-out types (HALL_SENSOR, ADC, DAC) that may not exist in the ComponentType enum.

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Pattern Registry

Patterns registered in

AKMHandler.initializePatterns()

:

Magnetometer Patterns

// 3-axis magnetic sensors
"^AK89[0-9].*"       // AK8963, AK8975 series
"^AK099.*"           // AK099xx high precision
"^AK8963.*"          // Electronic compass
"^AK8975.*"          // Electronic compass
"^AK09918.*"         // 3-axis compass

Sensor/IMU Patterns

// 9-axis and Hall sensors
"^AK09[0-9].*"       // General 9-axis
"^AK09911.*"         // 9-axis with accelerometer
"^AK09912.*"         // 9-axis with gyroscope
"^AK09913.*"         // 9-axis combined
"^AK0991[0-9].*"     // Hall sensors

Audio IC Patterns

// DACs and ADCs
"^AK449[0-9].*"      // Audio ADC series
"^AK479[0-9].*"      // Audio DAC series
"^AK4490.*"          // Premium DAC
"^AK5386.*"          // Audio ADC

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Official Replacement Logic

The

isOfficialReplacement()

method checks compatibility based on:

For Sensors (AK8x, AK09x)

1. Same series
2. Same resolution (14-bit vs 16-bit)
3. Compatible interface (I2C/SPI or unspecified)

For Audio ICs (AK4x, AK5x)

1. Same series
2. Same sample rate (48/96/192 kHz)

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Example MPNs with Explanations

Audio DACs

AK4490EQ
|  |  ||
|  |  |+-- Package: QFN (5x5mm)
|  |  +--- E: Enhanced variant
|  +------ 4490: Premium 32-bit DAC
+--------- AK: AKM prefix

AK4493SEQ
|  |  | |
|  |  | +-- Package: QFN
|  |  +---- S: Super variant
|  +------- 4493: Successor to AK4490
+---------- AK: AKM prefix

AK5386VT
|  |  ||
|  |  |+-- Package: TQFP (7x7mm)
|  |  +--- V: Voltage variant
|  +------ 5386: 24-bit stereo ADC
+--------- AK: AKM prefix

Magnetic Sensors

AK8963C
|  |  |
|  |  +--- C: Revision C
|  +------ 8963: 3-axis electronic compass
+--------- AK: AKM prefix

AK09918
|  |
|  +------ 09918: Latest 3-axis compass
+--------- AK: AKM prefix

AK09911C
|  |   |
|  |   +-- C: Revision
|  +------ 09911: 9-axis IMU with accelerometer
+--------- AK: AKM prefix

Hall Effect Sensors

AK09915
|  |
|  +------ 09915: Hall effect sensor
+--------- AK: AKM prefix

AK09970D
|  |   |
|  |   +-- D: Grade/variant
|  +------ 09970: Linear position sensor
+--------- AK: AKM prefix

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Related Files

• Handler:

  manufacturers/AKMHandler.java

• Component types:

  SENSOR

  ,

  MAGNETOMETER

  ,

  IC

• Pattern registry:

  PatternRegistry.java

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Learnings & Quirks

Handler Implementation

• getSupportedTypes() uses HashSet: Should be migrated to

  Set.of()

  for immutability (known technical debt)
• IC type needed: Audio IC patterns are registered under

  ComponentType.IC

  , so IC must be in getSupportedTypes() for matches to work correctly
• Commented-out types: HALL_SENSOR, ADC, DAC types are commented out in getSupportedTypes() - may indicate missing ComponentType definitions

Pattern Overlap

• AK09xxx series: Multiple patterns overlap (AK09[0-9], AK099, AK09911, etc.) - more specific patterns should be checked first
• Sensor vs Magnetometer: AK099xx matches both SENSOR (AK09[0-9]) and MAGNETOMETER (AK099) patterns - first match wins

Series Extraction

• Length varies by family: Audio ICs use 5 chars, sensors use 6 chars
• Includes variant letter: For sensors, the series includes the variant letter (AK8963C -> AK8963, but for shorter audio ICs AK4490EQ -> AK449)

Replacement Compatibility

• Sample rate matching for audio: Audio ICs require matching sample rates (48/96/192 kHz) for replacement compatibility
• Interface compatibility for sensors: Sensors with unspecified interface can match either I2C or SPI variants

Common Applications

• AK8963: Very popular in consumer electronics, used in smartphone compasses
• AK4490: Reference DAC for high-end audio equipment
• AK09918: Modern smartphone compass IC

Fire at AKM Factory (2020)

In October 2020, a fire at AKM's primary manufacturing facility severely impacted production:

• Many audio DAC/ADC products had extended lead times
• Some products were EOL'd
• Competitors (ESS, Cirrus Logic) gained market share
• Recovery took 2+ years for some product lines

Consider lifecycle status when specifying AKM components.

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