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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 T Resolution .................................... 0.6 T/count (X,Y), 1.2 T/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
8 10
7 5 3
6
6
7 5
8 10 2
9
1
2
4
4
3
1
10-pin WLCSP
Top View
10-pin WLCSP
Bottom View
Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 Pin Name GPO VSS AIZ I/O O Ground A/D input 3 A/D input 1 A/D input 2 Power supply for core (Typ. 3 V) Serial data Serial clock Power supply for interface (Typ. 1.8V) Device initialization Function General-purpose output pin
A A A I/Od I Is
AIX AIY VDD SDA SCL IOVDD RSTN
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)
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)
SCL SDA RSTN GPO : Serial clock input pin These pins are used with an external pull-up resistor. : Serial data input/output pin 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
Analog Input
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.
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YAS529
Block Diagram
Here is the internal block diagram of YAS529.
Block Diagram
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YAS529
Function Descriptions Analog Circuit Section
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.
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YAS529
Digital Circuit Section
Serial Data Interface YAS529 serial data interface supports I2C bus serial interface and operates in the slave mode. SCL (SCL) : Serial clock input pin SDA (SDA) : 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)
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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.
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YAS529
YAS529

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