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YAS529

MS-3C

Magnetic field Sensor

Overview

YAS529 is the Triaxial Geomagnetic Sensor IC integrating buffer amplifier, A/D converter, clock generator,

and serial data interface circuit (supports I2C bus) on one chip package.

YAS529 allows you to make up a high sensitive, compact and low-power electronic compass in a portable

GPS system or a mobile phone.

Features

● A manufacturing process that makes magnetic sensor on Si wafer with high precision realizes integration

with peripheral circuits on one chip.

● High sensitive geomagnetic sensor IC is realized by integrating magnetic sensors and low noise

amplifiers.

● High noise immunity is improved by digitizing output from geomagnetic sensor IC.

● External interface supports I²C bus (100kbps/400kbps, slave mode).

● Geomagnetic sensor with superior high board density and low-power consumption.

● Automatic power-down control mode is available after geomagnetic measurements.

● Three A/D input pins for an inclination sensor

● Power-down control of an inclination sensor with a standby pin by the use of the General-Purpose Output

(GPO) Pin

● Others.

Manufacturing process ......................... CMOS + Magnetic Sensor

Package ................................................ Lead-free 10-pin WLCSP package (YAS529-PZ)

Supply voltage for core ........................ 2.5 V to 3.6 V

Supply voltage for Interface ................. 1.65 V to VDD (Operating temperature : -20 to +95 °C)

2.30 V to VDD (Operating temperature : -40 to +95 °C)

Operating temperature .......................... -40 to +95 °C (Supply for the interface : 2.30V to VDD)

Consumption current during operation.

Magnetic field measurement ....... 4 mA (VDD = 3.0 V)

Magnetic sensor section

Measuring magnetic field range .. ±300 µT

Resolution .................................... ≦0.6 µT/count (X,Y), ≦1.2 µT/count (Z)

Measuring time

Magnetic sensor measurement .... within 10 ms (Three axes collective measurement)

Inclination sensor A/D ................ within 10 ms (Three axes collective measurement)

YAS529 CATALOG

CATALOG No.: LSI-BAS529A20

2007.6

YAS529

Pin Description

Here are figures for pin assignment and a table for pin descriptions.

9

1

8

10

2

7

5

3

6

4

6

4

7

5

3

8

10

2

9

1

10-pin WLCSP

Top View

10-pin WLCSP

Bottom View

Pin Descriptions

Pin No.

Pin Name

I/O

Function

O

-

1

2

GPO

VSS

General-purpose output pin

Ground

3

AIZ

A/D input 3

A

-

4

A/D input 1

AIX

5

A/D input 2

AIY

6

Power supply for core (Typ. 3 V)

Serial data

VDD

SDA

SCL

7

I/Od

I

8

Serial clock

9

Power supply for interface (Typ. 1.8V)

Device initialization

IOVDD

RSTN

-

10

Is

Note)

Connecting AIZ to VDD is recommended when used by connecting a biaxial inclination sensor.

When the inclination sensor is not used, connecting AIX, AIY, and AIZ to VSS is recommended.

No Schmitt circuit is used for SCL and SDA input pins.

A

I

Is

Od

O

: Analog input

: Digital input

: Schmitt input

: Open drain output

: Output

2

YAS529

Pin Functions

Power Supply (VDD, IOVDD, VSS)

z

These pins are for power supply of YAS529.

VDD

IOVDD

VSS

: Power Supply for core

: Power Supply for the Interface

: Ground

Serial Data Interface (SCL, SDA, RSTN, GPO)

z

SCL

: Serial clock input pin

These pins are used with an external pull-up resistor.

: Serial data input/output pin

SDA

RSTN

These pins are used with an external pull-up resistor.

: Serial data interface reset pin

“L” releases I²C bus.

When not used, connect to IOVDD pin.

: General-purpose output pin

GPO

Analog Input

z

AIX, AIY, AIZ : A/D input pin

Connecting AIZ to VDD is recommended when used by connecting a biaxial

inclination sensor.

When the inclination sensor is not used, connecting AIX, AIY, and AIZ to VSS is

recommended.

3

YAS529

Block Diagram

Here is the internal block diagram of YAS529.

Block Diagram

4

YAS529

Function Descriptions

Analog Circuit Section

z

Magnetic Sensor

○

YAS529 includes three Magnetic Sensors.

Only the sensor of an axis to measure at the time of magnetic field measurement is operated.

Buffer Amplifier

The buffer amplifier amplifies a signal output from the bridge of magnetic sensor.

The amplifier operates only when magnetic field measurement is made.

Temperature Sensor

This is the sensor to correct the temperature characteristics of the magnetic sensor.

The sensor operates only when temperature is measured.

A/D Converter (ADC)

The A/D converter converts input signals from magnetic sensor output amplified by the buffer

amplifier, temperature sensor output, and external input pin.

The converter operates only when a measurement is performed.

Clock Generator

○

The clock generator supplies clocks to ADC and digital circuits.

The generator operates only when a measurement is performed.

Power-on Reset

The Power-on Reset circuit detects a rising edge of the supply voltage for the core and

initializes the circuits.

Initialization Coil

○

The coils are used when the magnetic sensor cannot exert the original characteristics due to

receiving high magnetic field.

Generating magnetic field with the initialization coils initializes the magnetic sensor

characteristics.

Analog External Input A/D

The A/D measures values from analog external input.

Input range is from 0.5 to 2.5V. One count of A/D converter is about 3.0mV.

5

YAS529

Digital Circuit Section

z

Serial Data Interface

○

YAS529 serial data interface supports I²C bus serial interface and operates in the slave mode.

SCL (SCL)

SDA (SDA)

: Serial clock input pin

: Serial data input/output pin

Communication is performed through the above pins.

General-Purpose Output (GPO) Pin

○

YAS529 has GPO as general-purpose output pin. This output pin can be used for

purposes such as power-down control of an inclination sensor with standby pin.

6

YAS529

Example of System Configuration

Here is an example of system configuration.

When RSTN pin is not used, connect it to IOVDD pin.

Example of system configuration

Example of system configuration (RSTN pin is not used)

7

YAS529

Package Outline Drawing

Caution

* The product of the WLCSP package should be used under light-shielded conditions.

Since the WLCSP package has a structure that a silicon wafer is exposed, if light (such as sunlight) hits the

wafer, the device may malfunction (leak current increase etc.) due to electric charge internally generated by the

photoelectric effect.

* Please mount the package without underfill because temperature correction may not be normally performed

when mounting YAS529 on a board.

8

YAS529

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